Saturday, April 4, 2026

Why Industrial Engineering is Possible? Answer by Prof. R.M. Barnes

 

Three Major Channels of Process Improvement.
1. Process Redesign by Process Planning Team.
2. Process Improvement Study by Industrial Engineering Team.
3. Continuous #Improvement by Involving Shop Floor Employees and All Employees.
Continuous Improvement - Employee Participation Principle of Industrial Engineering


Both products and processes are designed by design teams. Where is the scope for industrial engineering to do further improvements?


Developments in engineering, scope for creativity application of existing knowledge as the issue is repeatedly examined for improvement, learning effect where ideas come with experience that is repeatedly doing a thing. Both creativity and learning effect occur in all employees of the organization including industrial engineers, production engineers, supervisors and operators. Industrial engineers, therefore have an opportunity to do continuous improvement of processes and products in the organizations through observation of processes, evaluation of recorded data, special studies, and involving all employees in process improvement and product improvement through suggestion schemes, brainstorming sessions, experimental projects, and trial demonstrations.



Design of the Product, Process and Production Facilities

At the time a new product or service is being designed or developed, consideration is always given to the system or process that will be required to manufacture the product or the service. Similarly when the process is being designed and various decisions regarding resources for production (equipment and tools for both production and working environment maintenance)are taken, any modifications required in the product design are evaluated.

At the design stage every effort is made to embed the knowledge available in published literature and from the internal sources of the organization are fully utilized to come up with the product and production system. Industrial engineers also contribute their knowledge and inputs at this stage.


Productivity Improvement - Industrial Engineering

Once the new product is introduced in the factory operations, the experience of the operators starts getting recorded. Operators, supervisors and engineers start identifying scope for further improvement of the process first and then the product. Also over the period, conditions in the market and operations facilities keep changing. Factors such as volume demanded and quality demanded in the market change. The kinds of raw materials, standard parts and their prices change. Better machines, equipment and accessories may become available. Therefore, the organization is confronted with the opportunity to improve products, processes and methods. Some of these possible changes are investigated and implemented by the product and process design teams of the organization. But it is the industrial engineering department that is given the responsibility to improve the product and process from the productivity improvement point of view incrementally periodically. The opportunities provided by the engineering, technology and supply organizations and the creative thinking of the internal employees based on their experience and increasing knowledge and expertise are to be coupled with the engineering and technical knowledge of the industrial engineers directed by productivity science.

Developments in productivity science, productivity engineering and productivity management disciplines are to be combined and the organization has to be taken forward in the productivity dimension.

If competitors go ahead in the productivity dimension, year after year,  the business will face survival crisis.

Industrial engineering is concerned with both machine effort and human effort in operations of the process.

It has to be done at element level in machines, operators, work place layout, working conditions, and elements of operations and processes.

R.M. Barnes, Ch. 6 Work Methods Design - Developing a Better Method. 

Motion and Time Study, 7th Edition, John Wiley, 1980, page 50.. 



This is an important topic. What is actually written by Barnes has to written.


Updated 4.4.2026,  19.5.2022, 29 Oct 2020

13.9.2020

Metal Droplet Jetting - Magnetohydrodynamic Liquid Metal Droplet jetting - A Low-Cost Additive Manufacturing Process


1995

Patent US5598200A   United States

Method and apparatus for producing a discrete droplet of high temperature liquid

Abstract

A method and an apparatus (10) eject on demand a discrete droplet (12) of liquid at a high temperature along a predetermined trajectory (18) by transferring a physical impulse from a low temperature environment to a high temperature environment. The ejector apparatus includes a vessel (26) having an interior (24) that contains a high-temperature liquid (14), such as liquid metal, Al, Zn or Sn. The interior includes an inlet end (30) that receives a thermally insulative impulse transmitting device (22) and a feed supply (34) of the droplet material, and a discharge region (56) having an orifice (16) through which the discrete droplets are ejected. An inert gas is feed through the inlet end and into the vessel to create an overpressure over the liquid so that as the overpressure is increased the droplet size is increased. A heater (70) heats the material contained within the interior. An impulse generator (20) is connected and imparts a physical impulse to the impulse transmitting device to produce an ejection pressure at the orifice to eject a discrete droplet of the high-temperature liquid. The impulse generator including a pulse generator electrically connected to a pulse amplifier that is electrically connected to an acoustic device, such as a loudspeaker.

Inventor  David W. Gore

Application US08/378,713 events 

1995-01-26

Application filed by Individual

1995-01-26

Priority to US08/378,713

1996-01-22

Priority to EP96904509A

1996-01-22

Priority to PCT/US1996/001132

1997-01-28

Application granted

1997-01-28

Publication of US5598200A

2015-01-26

Anticipated expiration

Status

Expired - Fee Related

https://patents.google.com/patent/US5598200A/en


2014

US20150273577A1

United States


Conductive Liquid Three Dimensional Printer

Abstract

A printer that produces objects from liquid conductive material is disclosed. In one embodiment, the printhead has a chamber for containing liquid conductive material surrounded by an electromagnetic coil. A DC pulse is applied to the electromagnetic coil, resulting in a radially-inward force on the liquid conductive material. The force on the liquid conductive material in the chamber results in a drop being expelled from an orifice. In response to a series of pulses, a series of drops fall onto a platform in a programmed pattern, resulting in the formation of an object.


nventorScott VaderZachary VaderCurrent Assignee Alloy Acquisition Corp LLC

Worldwide applications

2014  US 2017  US

Application US14/228,681 events 

2014-03-28

Application filed by Individual

2014-03-28

Priority to US14/228,681

2015-10-01

Publication of US20150273577A1

2017-03-13

Priority to US15/457,586

2017-04-11

Application granted

2017-04-11

Publication of US9616494B2

2022-02-04

Assigned to ALLOY ACQUISITION CORP, LLC

Status

Expired - Fee Related

2034-11-23

Adjusted expiration

https://patents.google.com/patent/US20150273577A1/en



2019

Back in 2013 father and son Scott and Zach Vader developed an alternative additive manufacturing process, Magnetohydrodynamic (MHD) printing. They applied for patent in 2014. Acquired by Xerox in February 2019, Vader Systems’ technology uses wire feedstock in lieu of powder. Gravity feeds the molten metal from a tiny crucible into a nozzle and jets individual molten metal droplets on demand, creating dense metallic parts.


Low-Cost Material 

The wire feedstock used in MHD can be as little as one fifth the cost of similar metal in powder form, making the process more cost effective and accessible for a variety of applications and industries.  MHD also allows for greater control and geometric freedom in the production of parts by customising drop size, placement and spacing.

Using its drop by drop method, MHD can produce engineered lattice structures without the need for support materials – by overlapping the metal droplets to create an in-built diagonal support system. This helps create more complex structures without the need to remove supports in post production, helping to save time and costs. Geometric complexity can be achieved more easily and more cost effectively than traditional methods like die casting and even PBF, making MHD ideal for lightweighting in industries like automotive and aerospace.

MHD is currently is most suitable for aluminium and zinc alloys, as well as for aluminium alloys that are traditionally considered ‘unweldable’. 

Research of Denis Comier - Earl W. Brinkman Professor of Industrial and Systems Engineering at Rochester Institute of Technology 


Prof. Comier experimented with using MHD to print aluminium circuit board patterns onto flexible plastic substrates and, he reported that worked quite well. Drop off in conductivity was not there and there is good adhesion to the plastic. The  feedstock is two orders of magnitude less expensive than silver nanoparticle inks, which could be a real game-changer in advancing printed electronics from research into industrial applications.

https://www.theengineer.co.uk/content/opinion/how-metal-droplet-jetting-could-make-metal-printing-viable


Molten metal jetting for additive manufacturing

Abstract

In molten metal jetting, where droplets of metal are jetted to 3D print a part, each layer may be traversed each successive layer with a normalizing grinding wheel or other leveling device such as a layer to level each successive layer, and/or the melt reservoir or printing chamber may be filled with an anoxic gas mix to prevent oxidation.


Application US16/427,448 events 

2019-05-31   Application filed by Markforged Inc

2019-05-31   Assigned to MARKFORGED, INC.

2019-12-12    Publication of US20190375003A1

2020-03-17    Publication of US10589352B2

2024-12-04  Assigned to CONTINUOUS COMPOSITES INC.

https://patents.google.com/patent/US10589352B2/en


2021

Phd Thesis, 2021

Direct Writing of Printed Electronics through Molten Metal Jetting

Author
Manoj Meda

Advisor
Denis R. Cormier

Advisor/Committee Member
Marcos Esterman

Advisor/Committee Member
Rui Li

Recommended Citation
Meda, Manoj, "Direct Writing of Printed Electronics through Molten Metal Jetting" (2021). Thesis. Rochester Institute of Technology. Accessed from

Magnetohydrodynamic liquid metal droplet jetting of highly conductive electronic traces
Manoj Meda, Paarth Mehta, Chaitanya Mahajan, Bruce Kahn and Denis Cormier∗
Rochester Institute of Technology, Rochester, NY, United States of America
Flex. Print. Electron. 6 (2021) 035002 



2025

New  Possibilities for Lattice Design and Additive Manufacturing with Molten Metal 3D Printing
 Phd Candidate: Paarth Mehta     Faculty: Denis Cormier
Rochester Institute of Technology

The burst mode MMJ technique paves the way for lightweight lattice designs that were previously unattainable through other metal 3D printing
methods. As the technology progresses, faster printing with a more comprehensive range of alloys will be possible. Molten metal 3D printing is
becoming essential for fabricating high-performance components across major industries. The breakthroughs from this research will help drive the
overall increased adoption of metal additive manufacturing.

How does molten metal droplet jetting compare to traditional nanoparticle-based conductive inks?
This presentation was given by Denis Cormier from Rochester Institute of Technology at The Future of Electronics RESHAPED USA | Boston 2025 conference and exhibition

2026

Supplier offering Liquid Metal Jetting Parts

RIT AMPrintCenter


Molten Metal Jetting (MMJ) is an emerging metal AM process that offers low cost production


The potential advantages of metal additive manufacturing (AM) envisaged include the elimination of tooling costs, the possibility of on-demand manufacturing close to the point of need, near net shape production that reduces material consumption, and the ability to produce complex geometries that are impossible to make with conventional processes. But  much of this potential has not been realized. The majority of production applications for metal AM have been limited to low volume, high-value parts for the aerospace and biomedical industries. Outside of those industries, it is often said that if a part can be CNC machined, then it will be faster and less expensive to CNC machine it than to make it via metal AM. The reasons for this are: Production grade metal AM machines often cost several multiples of the price of one CNC milling machine. Likewise, metal powder can be ten times or more expensive than bar stock used in CNC machining. Per-part print times can run hours to days, versus minutes to hours for CNC machining. 

Laser Powder Bed Fusion (L-PBF) is the dominant metal AM process at the present time. l-PBF processes are well understood and are exceptionally well suited for making relatively small parts with intricate detail. The high cost of l-PBF machines and metal powder, coupled with low production speeds and environmental health and safety concerns explain why l-PBF has struggled to gain significant traction beyond the aerospace and biomedical industries. Binder jetting is likewise well suited for production of small metal parts with intricate detail. The equipment costs of binder jetting machines coupled with production-scale debinding and sintering furnaces are similar to those of l-PBF machines. Binder jetting likewise has similar concerns with the cost of metal powders and infrastructure needed to safely handle those powders.

Wire-feed Directed-Energy-Deposition (DED) methods (e.g., Laser Wire DED, Wire Arc AM and Electron Beam Wire AM) typically have lower per-part material costs than powder-based metal AM processes. The relatively high material deposition rates and robot motion stages make them well suited to produce very large parts. The tradeoff for high deposition rate with these processes is coarse feature resolution.

Molten Metal Jetting (MMJ) is an emerging metal AM process that uses on-demand ejection of molten metal droplets from a nozzle to produce metallic parts. There are multiple approaches to generating droplet ejection pressure pulses in MMJ printheads. Pressure may be generated via magnetohydrodynamic (MHD) , electrohydrodynamic (EHD), pneumatic, or vibrating piston jetting methods. Regardless of the droplet actuation method, each of these MMJ variants melts metal in a crucible prior to deposition. This means that any form of feedstock material may be used, including wire, rod, or even grain produced from ingots. For systems that use ingot as the feedstock material, the raw material cost of near net shape MMJ is even lower than that of CNC machined raw material. That represents a very important step towards tilting the scales from CNC machining with large material waste towards use of metal AM.

MMJ has been used to jet alloys of tin, alumimum, and Copper. . Reported droplet diameters range from as small as 50 µm  to as large as 700 μm. Current state of the art commercially available systems claim deposition rates up to 199  using a drop size of 700 µm. There is obviously a tradeoff between deposition rate and feature resolution when selecting the diameter of the nozzle that droplets are jetted from. To increase deposition rates without sacrificing feature resolution, an array of individually addressable nozzles can be used. 


Ud. 4.4.2026
Pub. 2.4.2026


























Difference Between Industrial Systems Engineering and System Industrial Engineering

Industrial Systems Engineering focuses on design of new engineering systems and major redesign of existing engineering systems. The systems have to be designed for effectiveness. The design of the product and process have to give output that have customer acceptance and customer willingness to pay reasonable price. Engineering is now spread over number of branches and industrial systems designers have to specialize in particular branches and acquire sufficient knowledge to design the systems and their components. The systems engineering is a major and complex activity involving hundreds and thousands of persons. In addition to the technical skill of visualizing the system and designing certain components, the systems engineer needs the managerial skills to build teams, plan, direct and control their activities at various levels.


System Industrial Engineering is concerned with being with the process during operation of the system and doing continuous improvement. The continuous improvement is triggered by problems experience by the operators, creativity of the operators and engineers to suggest improvements, new developments in engineering and technology, and productivity science developments. System industrial engineers also have to stay abreast of technological developments related to operations in the processes of their organizations.


THE UNIVERSITY OF ARIZONA - College of Engineering View


Engineering is a vital profession not only for keeping our technology and infrastructure running, but for exploring and designing new systems and ideas. As the pace of technological evolution accelerates, so do the opportunities for engineers to make inventions and build remarkable innovations. 

This article will discuss two branches of engineering that rely on a systems point of view: systems engineering and industrial engineering.


WHAT IS THE DIFFERENCE BETWEEN INDUSTRIAL AND SYSTEMS ENGINEERING?

The Institute of Industrial & Systems Engineer (IISE) describes the focus of systems and industrial engineering as follows: “Industrial and systems engineering is concerned with the design, improvement and installation of integrated systems of people, materials, information, equipment and energy.”


Systems engineers design and optimize complex systems. They work with an array of other technology professionals, including software engineers, hardware engineers, and programmers.

Industrial engineers manage and improve manufacturing processes and service operations. An industrial engineer is primarily concerned with finding ways to better utilize machinery, employees, and additional assets that impact operations.


Our systems engineering courses focus on both technical proficiency with engineering concepts and principles, and project management.


Systems engineers use expert knowledge of engineering, computer science, and mathematics to design computing technology, software, and other systems.


In addition to their everyday responsibilities, systems engineers are expected to keep their technology skills up-to-date.


The University of Arizona Master of Science in Industrial Engineering program helps students develop key skills in industrial engineering, including how to supervise high-tech production processes and optimize manufacturing operations. The program provides students with an in-depth exploration of technical skills including automation, traffic modeling, and computer-integrated manufacturing.








To be updated.

Ud. 4.4.2026


Pub. 21.12.2020


Decision Making in Industrial Engineering

 

Industrial Engineering Decisions

Industrial engineers have to make many decisions in industrial engineering studies and develop projects for approval and implementation.


Examples include eliminate decisions, whether to retain an existing operation or eliminate it, combining or dividing existing operations, changing the sequence of operations. Simplifying or improving an operation require many more decisions. Machines to be used, jigs and fixtures to be used, tools to be used, number of operators to be employed etc. are decisions. Planning decisions like batch quantity and schedule are to be examined and fresh decisions have to be taken.

Is there a systematic procedure for decision making?


Decision Making - Introduction


Decision making is the actual selection from among alternatives of a course of action.

Decision making is involved in various functions of management (Industrial engineering is a function of management with foundation in engineering). Hence, it is a step in planning. Planning occurs in managing organizations or in personal life whenever choices are made in order to gain a goal in the face of such limitations as time, money, and the desires of other people. The steps involved in planning are:

1. Being aware of opportunity
2. Establishing objectives
3. Premising
4. Determining alternative courses of action
5. Evaluating alternative courses
6. Selecting a course
7. Formulating derivative plans

Developing Alternatives


Planning comes into picture whenever a goal is to be attained. Choice of goal itself is a planning problem. If we assume that there is a goal to be achieved, the next step in the planning is to develop planning premises. Premises are planning assumptions, the future setting in which planning takes place. We can term them as the environment of plans in operation. Premises include forecast data of a factual nature, applicable basic policies, and existing company plans.

Developing alternative courses of action is taken as the first step in decision making. Managers have to develop alternative courses for any decision to be made. A sound adage for the manager is that, if there seems to be only one way of doing a thing, that way is probably wrong. More rationally, a planning principle called principle of alternatives can be specified. In every course of action, alternatives exist, and effective planning involves a search for the alternative representing the best path to a desired goal.

The ability to develop alternatives is often as important as making a right decision among alternatives. Ingenuity, research, and perspicacity are required to make sure that the best alternatives are considered before a course of action is selected (Important point to note: Industrial engineers must have adequate engineering knowledge to make decisions regarding machine, tools, jigs and fixtures, speeds and feeds etc.) Then creativity and ingenuity are required to employ the devices to get the required output efficiently.

Principle of Limiting Factor


Chester Barnard has written, "the analysis required for decision is in effect a search for the "strategic factors."

Strategic factors and limiting factors are synonyms but Barnard suggests that we use the term limiting factor for physical things and when personal or organizational action is the element, we should use the term strategic factor. When we want to achieve some goals of system, we examine its parts or factors. Strategic factors or limiting factors are those parts or factors which if changed would accomplish the desired purpose if other factors or parts remain unchanged. The principle of limiting factor says, if in developing alternatives, the more an individual can recognize and solve for those factors that are limiting or critical to the attainment of a desired goal, the more effectively and efficiently he can select the most favorable alternative.

Discovery of limiting factor lies at the basis of selection from alternatives and hence of planning.

(This point was mentioned by Prof. Pankaj Ghemawat in his book "Strategy and the Business Landscape.")

Process of Evaluation

After a reasonable number of alternatives have been developed, the next step in decision making is evaluating these alternatives. In most decisions, there are certain tangible factors to be assessed in terms of dollars, man-hours, machines hours, units of output, rates of return on investment, or some other quantitative unit. There are other factors that can be hardly quantified. However, both the tangible and intangible factors must be weighed in deciding upon a course of action.

Basis for Selection Among Alternatives


Experience

Experience managers decide based on the things they have successfully accomplished and the mistakes made in unsuccessful projects. To some extent, experience is the best teacher.

If the manager, distills from experience the fundamental reasons for success for failure, then experience can be useful as a basis for decision analysis in case of complex problems in modern enterprises. Managers can also learn from the experience of others when fundamental reasons are provided by the experienced managers. It will be similar to the output of scientists

Business Research and Analysis

Research and analysis is used for major decisions. This approach demands that the problem is first understood. The variables, constraints and the premises are relevant to goal achievement are identified and documented. Then a model can be developed to simulate the problem. Architects often make models of buildings in the form of drawings and also in three dimensional models. Similarly engineers make drawings. Models of airplane wings and missiles are made and tested in wind tunnels. Management models are amenable to research and analysis through models.

Operations Research

Operational research scholars and practitioners have developed number of models to help in decision making in certain management problems like transportation decisions, assignment decisions, inventory decisions, scheduling decisions, queuing line decisions etc.

Experimentation

Scientists use experiments to collect data as well as to test their theories. Managers can also use experiments to find the results of various alternative courses of action.  The emergence of intangible factors can be observed during experiments. It is expensive but useful as risk management device. Test marketing is one example where experiments are routinely used business decision making. In new product introductions prototypes are made to evaluate the technical working of the product.

F.W. Taylor did many experiments changing the value of one variable while keeping all other constant. But modern design of experiments approach, allows us to reduce experiments while two or more variables of the problem in a planned way and will give the required result.

For more details of Taylor's experiments on metal cutting read:

Evaluating the Decision's Importance


Size or length of commitment: If a decision commits the enterprise to heavy expenditure of funds it should be subjected to suitable attention at top management level.

Flexibility: Decisions involving inflexible courses of action need attention.

Certainty of goals and premises: Production decisions based on order backlog are more routine in comparison to made to stock decisions.

Quantifiability of variables: If variable can be quantified decision making is more routine.

Human impact: Where the human impact of a decision is great, its importance is high.


Importance of experience, experimentation, research, analysis

Decision support systems

Systems approach

Creativity and Innovation


Developing alternatives and finding novel ways that are profitable alternatives requires creative thinking. Creative thinking refers to the ability and power to develop new ideas. Innovation means the use of ideas as new products, new service, or a new way doing things which enhances effectiveness or efficiency. Weihrich and Koontz explain creative thinking as four step process.

1. Unconscious scanning
Allowing the mind to think over the problem and do its process without a conscious effort.

2. Intuition
Intuition is an answer to the problem that is thrown up by the mind. This is the output of the unconscious scanning effort.

3. Insight
Insight also an idea that comes up during investigations to solve a problem. They are to be captured immediately on paper to make us of them later.

4. Logical formulation or verification
Intuition as well as insight is to be tested through logic or experiment. The logical verification is done first by the person himself and then by inviting critiques from others.

Developing Creativity in Individuals and Groups


Creative thoughts are often the fruits of extensive efforts. They are also the result of responding to feedback from others. Creativity can be taught. Some creativity techniques are focused on individuals and some are focused on group.

Creativity and Manager

The creativity of most individuals is probably underutilized in many cases, despite the fact that unusual innovations can be of greater benefit to the firm. Creativity of individuals and groups has to be subjected to managerial judgment. It is the manager who must weigh the risks involved in pursuing unusual ideas and translating them into innovations.

Management Theory Review: Decision Making - Review Notes

References

Joseph V. Anderson, "Weirder than Fiction: The Reality and Myths of Creativity," Academy of Management Executive, November 1992, pp. 40-47.

Erik Dane and Michael G. Pratt, "Exploring Intuition and its Role in Managerial Decision Making," The Academy of Management Review, January 2007, pp. 33-52.

Robert C. Litchfield, "Brainstorming: A Goal-Based View," The Academy of Management Review, July 2008, pp. 649-668

The planning principles involved in the topic


Principle of alternatives


Select the plan which is the most effective and the most efficient to the attainment of a desired goal.


Principle of limiting factor


Consider limiting factor in generating alternatives and selection from alternatives.




MIT Sloan Management Review - LinkedIn Post 4.4.2026

Every leader should design and communicate how they want to make decisions. Making it clear what you care about, what you need to know about, and what you’re tasking others to move on will help minimize confusion about who should be making which decisions. It also helps clarify when you as the leader can be kept out of a decision, when you should be pulled in, and how requests for your feedback should be communicated.

When should a leader be pulled into a decision, and when can team members move autonomously? Identifying decisions as low risk or high risk and low urgency or high urgency helps to clarify expectations.




Principles of Management - Online Book with Globally Popular Content


Friday, April 3, 2026

Factory Expense - Problems of Distribution - Going Industrial Engineering

Factory Expense



Now if our product is simple and all of one kind, the
determination will be easy enough. It is when product is
diversified that accurate cost accounting becomes difficult
and at the same time becomes more important. Suppose,
for example, we are running a cotton-seed oil mill and mak-
ing a single grade of oil. The cost per pound is very
simply found by dividing total expenditures by the total
number of pounds made. But suppose, further, we decide
to branch out and work up our own product. We install
a refinery and begin to put out a fancy grade of oil for
table use; we get up a " lard substitute "; we install a soap
works and make several grades of toilet and laundry soap ;
we follow with a glycerine plant; and finally we manage
to do something with several kinds of by-products. Now
we have a number of different products, selling at very
different prices, in different markets, and under different
conditions of competition. There may be big money in
lard compound, while the soap market is so hard pressed
by competition or so captured by large manufacturers who
lavish money on advertising that we can not sell soap at
a profit. But unless we know accurately what lard com-
pound costs us per pound, or what soap costs us per box,
how can we tell that there is a profit in one and a loss in
the other? How can we know that we should put all our
raw material into lard compound and cultivate that market,
and that we should shut down the soap factory? Knowl-
edge of costs is the guide to success and, indeed, a necessity
to existence in modern commercial manufacturing.

In this exact determination of costs the most troublesome
factor as already stated is the element of expense. Material
and labor are fairly concrete, definite and tangible things.
We can see them, weigh them, measure them, and connect
them directly with the product they assist to form. If we
take any single article in the whole output of our plant,
whether it is a pound of cottolene, a cake of soap, a hat,
a globe valve or a dynamo, we should be able by com-
paratively simple records and accounts to know exactly the
value of the material that went into it, and exactly the out-
lay for the direct labor that has been expended upon it.

But in the total expenditures of any manufacturing busi-
ness there is a very large outlay (usually a very large frac-
tion of all the outlay) that is not for material, and is not
for labor, and yet we must get it back from our customers.
A proper proportion must be repaid to us in the price we
get for each bit of product we sell. If each article sold
does not repay us for its just proportion of these general ex-
penditures, as well as for its just proportion of material
and labor, our business will be headed toward failure and
not toward success.

It is these miscellaneous expenditures, not of themselves
productive of anything and yet necessary to the production
of things, that make up the expense account.

Among them are rent or interest on the cost of land
and buildings, insurance, repairs, salaries of general officers
or officials, of clerical staff and all unproductive labor,
power, light, heat, legal expenses, advertising and selling,
etc. The total is a load bearing upon the extra business,
and each item of product must carry its share hence
the figure of speech, " burden."

The distribution of expense (that is, the assessment of
a just and proper fraction of it as a part of the cost of
each item of our product) is not only one of the most dif-
ficult, but also one of the most controversial and most un-
satisfactory problems of works management or shop ac-
counting. This is because expense is not like the material
and labor components of a manufactured product, which
are absolute, concrete factors known quantities that are
permanent, fixed and absolute in value. The expense
component of any single item is really an elusive variable,
to which we give a value arbitrarily taken because it solves
some particular case or problem.

Let us illustrate the point again by means of a pocket-
knife. Let us suppose the simplest possible conditions
that we are making nothing but one kind, size, and style of
knife. Suppose our cost records show that the material used
in this knife is worth 20 cents, and the labor that made it an-
other 20 cents. Our prime or flat cost, as it is called, is 40
cents. We find, perhaps, that by the most careful and cor-
rect compilation and distribution we can make of all our fac-
tory expense (that is, our expenditures for things other than
material and direct labor), this knife should be burdened
with an expense charge of 10 cents that is, it should be
considered to have cost 20 cents for material, 20 cents for
labor, and 10 cents for expense, in order to return to us
our entire manufacturing expenditure. Let us suppose
that of this 10 cents expense burden i cent goes to pay
this knife's proportion of the president's salary, and I cent
goes toward the general manager's salary, and 3 cents go
for other office salaries, and i cent goes for rent, and i
cent for the coal bill, and i cent for general repairs and
2 cents for sundries.

Now suppose we had not made this particular individual
knife. Our cost facts as to material and labor would prove
their absolute truth by transposing the equation. We
should actually save 20 cents for material and 20 cents for
the labor. That 40 cents would remain unexpended and
we should have it in the treasury. We would save 40
cents in actual money by refraining from the manufacture
of this particular article. But our assumed expense fact
goes all to pieces. We do not, by not making this knife,
save i cent on the president's salary, or i cent on the gen-
eral manager's salary, nor do we reduce our rent, or lessen
our repairs, or cut down any of those other expense items
(except possibly the coal) by the figures we attributed to
the expense burden of this individual knife. What does
happen is that all the other knives we do make have to
bear between them just the same total expense as before,
or a little larger expense burden each.

But let us not leave this example without noticing an-
other point. We have remarked so far that a difference
of even one knife more or less in our total product makes
a corresponding actual difference in our total outlay for ma-
terial and labor, but practically no difference in our total
expense account; and we have deduced from this that a
scheme of expense distribution that is true for a certain
volume of output becomes untrue at any other volume of
output, whether larger or smaller.

It would be incorrect, however, to assume that the ex-
pense burden as a whole does not ever vary, or indeed that
it does not vary considerably, with varying volume of busi-
ness. The truth is that expense burden is made up of a
large number of elements, some of which go up and down
in general correspondence with the volume of business and
some of which do not. In other words, our total expense
is divisible into two classes constant and variable. The
former division (constant expense) includes all expense
items necessary, so to speak, to the mere existence of the
business, while the latter division (variable expense) includes
all items connected with the activity of the business.

For example : In the constant-expense section we should
include rent, or its equivalent in interest, insurance and
taxes, if we own our real estate and buildings. This clearly
remains uniform or unchanged, whether the factory be
busy or idle. Another such item is the salaries of general
officers ; they draw their pay the same in good times or in
bad. It is true that on a very great expansion of business
we might have to acquire more ground and put up more
buildings, or rent more space, or enlarge our organization
and add more salaried officers. Or in very dull times we
might give up some of the property we have been renting
and we might cut down official salaries; and so these so-
called constant expenses may change. But if they change
it is by occasional large steps of this kind. They remain
level for long periods, and there is a minimum below which
they can never go if the business is to continue to exist at
all.

On the other hand, expenses like advertising, selling,
correspondence, clerical assistance, drafting, power, trans-
portation, foremen, yard labor all these go up and
down on curves corresponding closely and quite sensitively
to the amount of business we are doing, and many of them
can be completely cut off if the plant is wholly shut down.

So the second great point to keep in mind is that while
the ratio of expense to productive labor and materials (or
in other words, the proportion of our total cost chargeable
to expense) is variable and is constantly varying in a way
that from an accounting point of view is very troublesome,
this variation is caused by the fact that a certain very
large part of our expense account is constant, or nearly so,
however our total volume of business may vary. It sounds
like a paradox, but the proportion of expense varies be-
cause the total of expense does not. This fixed necessary
outlay stands little changed from month to month, while
the gross income against which this is balanced fluctuates
now up and now down.

The result is that as business becomes more active the
expense ratio drops even though the expense total may
rise, while as business shrinks the expense ratio rises even
though the expense total may fall. This is the reason why
in dull times dividends on industrial and railways stocks are
so frequently reduced or passed. Business may be (say)
50 per cent of normal; purchases are cut down, hours are
shortened, employees are discharged, trains are laid off,
purchases of material are suspended, actual operations and
expenditures for actual production are cut down to one-
half but profits do not remain at half the normal. They
vanish entirely and a deficit appears instead because the ir-
reducible constant expense eats all and more than the gross
profits earned by the 50 per cent activity.

To come back now to our imaginary knife factory; we see
that while we may be certain enough what our whole ex-
pense account amounts to, the assumption that the indi-
vidual expense burden chargeable to each individual knife
is 10 cents is an assumption only. It is a convenient ap-
proximation to truth which holds good under average con-
ditions, but begins to depart from truth as soon as and as fast
as conditions depart from average. That is the first diffi-
culty in distributing expense burden.

But suppose, further, we are making not only pocket
knives, but also carving knives and safety razors. We can
tell exactly how much material and how much direct labor
each pocket knife, and each carving knife and each safety
razor takes. We can tell exactly how much our total ex-
pense is. But how shall we tell just how much of this
total expense is occasioned by the manufacture of a carving
knife, of a safety razor, or of a pocket knife, or whether
there is more general expense occasioned by the manufac-
ture of one of these articles than by another? Does forg-
ing a carving blade consume more power and use more coal
than forging a pocket-knife blade, or does timekeeping and
clerical labor run higher in the safety-razor shop than it does
in the pocket-knife department? Should, therefore, each
carving knife or each safety razor (for these and other
similar reasons) bear a larger burden of expense than each
pocket knife? If so, how much?

May be the carving-knife account does not show satis-
factory profits, and we think of giving up that branch of
the business. But are the apparent profits small because
we are charging it with more than its true share of ex-
pense, and thus relieving the pocket knives and the safety
razors of some of the burden they ought to bear? If we
drop the manufacture of carving knives, will our expense
account drop by the amount of burden we have been charging
up to the carving-knife department, or shall we still find the
same old expense totals bearing now wholly on pocket
knives and safety razors and shall we be worse off rather than
better? Would it be sound policy, instead of abandoning
any line, to add still another that would bring a reasonable
profit over the flat cost of materials and labor, in the ex-
pectation that in fact no increase of expense would be oc-
casioned, and we should be just that much ahead on our
total profit and loss account?

Here we see the second difficulty in the expense distri-
bution, which is to apportion the total properly among
the several or many lines of product in a varied manu-
facturing business, so that the calculated costs of each (on
which we base our selling prices) may be as near as possible
to truth. Then whatever line may expand or contract we
shall be safe from disastrous disappointment in the total
of our profits.

In order to see more clearly how the proportion of ex-
pense justly chargeable to various lines of products may vary
that is, how various components of expense are created
in unequal proportion by various classes of manufactured
goods, and hence should be borne with corresponding in-
equality by these various classes and to see also some of
the considerations affecting the distribution of expense, let us
imagine that we are making a hasty tour through a machine-
shop and let us see in part how and where the burden is
created. We will assume that the shop makes its own
castings and we will begin with the foundry. The material
(pig iron) and the labor of molders, helpers, core-makers,
etc., on each and every job and piece, can be pretty closely
recorded, so that our material and direct-labor costs are
reasonably exact. But here are some men who are not en-
gaged in making any special casting into which their work
goes and to which it can be charged; they are wheeling sand,
shaking out flasks, charging the cupola. Here is coke go-
ing into the cupola to be burned, and power being used for
the cupola hoist and for furnishing the blast. Without
searching any further, we find already an aggregated out-
lay an expense burden which we can not attach to any
one piece of material or to any one job, but which we must
distribute somehow among all the jobs done that day or
on that melt.

We see however, further, that there is another cupola
on which men are busy making repairs. Evidently there
is an outlay for refractory linings, labor, and incidentals,
which must somehow be loaded on to the foundry product
and repaid by its sale. We must keep our cupola in re-
pair; it costs money to repair it, and we must manage to
get our money back. But this expense was incurred through
wear and tear attending the melting of iron for all the
castings made in a week or a month, perhaps. Our total
of this repair bill, then, must be distributed over the jobs
of that whole period if each is to bear its fair burden.

We see, further, that other men are at work removing
dust from the rafters, repairing the roof, and white-wash-
ing or painting the whole foundry building. They are
remedying the deterioration or decay of possibly a year.
Again, money spent in general expenses, to be recovered
in the sale of product. Here is another item of burden to
be spread over a still wider section of our output.

Here, in all these cases, we have burden limited in dis-
tribution according to time.

We pass to the machine-shop, and we see a large overhead
crane transporting a heavy engine bed to the planer. The
crane itself represents invested capital which is disappearing
constantly year by year as the machine in which it is in-
vested wears out. Furthermore, it costs money to run that
crane money for interest on the investment required for
its installation, for power to run the crane, for the man who
operates it. Some of this cost accumulates night and day,
whether the crane is running or is idle; some accrues only
when it is in operation. But it accrues, and we must charge
it against our product somehow and get it returned to us
with profit. Evidently, though, it would be unfair to levy
any of it against our lighter lines of manufacture, which do
not need crane service and never use it. On the other
hand, here is a little industrial railway used for moving
light and medium-weight pieces around the shop. This is
an expense item of similar sort, but here the burden is not
chargeable against heavy product.

Here we have burden limited in distribution by weight or
character of product.

We enter the lathe department and find a foreman in
charge. His wages are paid him every week and enter
into the total of our manufacturing costs, but they do not
appear on the job tickets for any of the individual items
of work handled on the lathes. His wages, also, then,
must be taken care of in the manufacturing-expense burden;
but they are incurred in connection only with the lathe
work, and in justice no fraction of them should be attached
to any of our manufactured product which has not had lathe
work done upon it.

Here we have burden limited in distribution by the char-
acter of operation.

As we pass through the shops, we notice here and there
a timekeeper at work, securing data as to the times when
jobs had been begun or finished, and here as we approach
the offices is a room where several clerks are entering the
time records and computing premiums or bonuses. Evi-
dently this is a necessary auxiliary to our productive system,
although it is itself unproductive. The cost of the employ-
ment of these clerks and of attendant expenses must go into
our burden; what particular fraction of it is theoretically
attached to any particular machine we manufacture and
sell, obviously should depend upon the complexity of that
machine the number of parts, and hence of operations
and times, which had to be recorded, and the demands its
computations and calculations make upon the time and
services of the time clerks. Here we have burden varying
according to the complexity of the product.
Next, if we
look into the sales office (as we should do) we shall see
a probably large and expensive force of men, with the aid
of considerable outlay for office assistants, advertising, and
publicity work. The total of this expense of this com-
mercial burden must be taken care of, and if we look
into it we shall probably find that the necessity for these
expenses varies very widely between different lines of our
manufacture. Standard product disposed of through
dealers probably almost sells itself. Special business, or
new business for which the market must be created, prob-
ably costs a great deal to work up. Here we have burden
varying according to commercial conditions.

It will be apparent from the view we have had so far
that no absolute, mathematically correct and invariably
true distribution of expense can be made. We must ac-
cept some reasonably fair distribution that will serve within
allowable limits of error under ordinary fluctuations in busi-
ness, and we must give separate and careful attention to
extraordinary conditions that may make our methods and
figures, temporarily at least, inaccurate. The methods
generally used are more or less rough-and-ready approxima-
tions, convenient to use, sometimes as misleading as they
are convenient, but often quite good enough for practical
purposes, especially as the experienced industrial manager
has a sort of sixth sense, or specially trained common-sense,
by which he corrects the occasional false readings of his
cost system.

These methods will be outlined in the following chapter. 1

1 A very thorough discussion of this subject will be found in " The
Distribution of Expense Burden," by A. Hamilton Church ; The Engineer-
ing Magazine. 


Ud. 3.4.2026
Pub. 18.9.2023

Machine Work Study - Machine Tool - Metal Cutting - Taylor - Part 1


The Machine Work Study was done by Taylor over a period of 26 years on metal cutting over the period of 1880-1906 and the results of the study as productivity science of metal cutting were presented in the 1906 conference of ASME. Taylor himself was the president of ASME and he gave the presentation as Presidential Address.

Results of 50,000 experiments

The following is a record of some of our more important steps: _

33 (A) In 1881, the discovery that a round-nosed tool could be run under given conditions at a much higher cutting speed and there- fore turn out much more work than the old-fashioned diamond- pointed tool.

34 (B) In 1881, the demonstration that, broadly speaking, the use of coarse feeds accompanied by their necessarily slow cutting speeds would do more work than fine feeds with their accompanying high speeds.

35 (C) In 1883, the discovery that a heavy stream of water poured directly upon the chip at the point where it is being removed from the steel forging by the tool,would permit an increase in cutting speed, and, therefore, in the amount of work done of from 30 to 40 per cent. In 1884, a new machine shop was built for the Midvale Steel Works, in the construction of which this discovery played a most important part; each machine being set in a wrought iron pan in which was collected the water (supersaturated with carbonate of soda to prevent rusting), which was thrown in a heavy stream upon the tool for the purpose of cooling it. The water from each of these pans was carried through suitable drain pipes beneath the floor to a central well from which it was pumped to an overhead tank from which a system of supply pipes led to each machine. Up to that time, so far as the writer knows, the use of water for cooling tools was confined to small cans or tanks from which only a minute stream was allowed to trickle upon the tool and the work, more for the purpose of obtaining a water finish on the work than with the object of cooling the tool; and, in fact, these small streams of water are utterly inadequate for the latter purpose. So far as the writer knows, in spite of the fact that the shops of the Mid- vale Steel Works until recently have been open to the public since 1884 no other shop in this country was similarly fitted up until that of the Bethlehem Steel Company in 1899, with the one exception of a small steel works which was an offshoot in personnel from the Midvale Steel Company.

36 (D) In 1883, the completion of a set of experiments with round nosed tools; first, with varying thicknesses of feed when the depth of the cut was maintained constant; and, second, with varying depths of cut while the feed remained constant, to determine the efiect of each of these elements on the cutting speed.

37 (E) In 1883, the demonstration of the fact that the longer a toolis called upon to work continuously under pressure of the shaving, the slower must be the cutting speed, and the exact determination of the effect of the duration of the cut upon the cutting speed.

38 (F) In 1883, the development of formula: which gave mathematical expression to the two broad laws above referred to. Fortunately these formulae were of the type capable of logarithmic expression and therefore suited to the gradual mathematical development extend- ing through a long period of years, which resulted in making our slide rules, and solved the whole problem in 1901.

39 (G) In 1883, the experimental determination of the pressure upon the tool required on steel tires to remove cuts of varying depths and thickness of shaving.

40 (H) In 1883, the starting of a set of experiments on belting described in a paper published in Transactions, Vol. 15 (1894).

41 (J) In 1883, the measurement of the power required to feed a round-nosed tool with varying depths of cut and thickness of shaving when cutting a steel tire. This experiment showed that  EVERY MACHINE  TOOL required as much pressure to feed it as to drive the cut. This was one of the most important discoveries made by us, and as a result all steel cutting machines purchased since that time by the Midvale Steel Company have been supplied with feeding power equal to their driving power and very greatly in excess of that used on standard machine tools.

42 (K) In 1884, the design of an automatic grinder for grinding tools in lots and the construction of a tool room for storing and issuing tools ready ground to the men.

43 (L) From 1885 to 1889, the making of aseries of practical tables for a number of machines in the shops of the Midvale Steel Company, by the aid of which it was possible to give definite tasks each day to the machinists who were running machines, and which resulted in a great increase in their output.

44 (M) In 1886, the demonstration that the thickness of the chip or layer of metal removed by the tool has a much greater effect upon the cutting speed than any other element, and the practical use of this knowledge in making and putting into everyday use in our shops a series of broad-nosed cutting tools which enabled us to run with a coarse feed at as high a speed as had been before attained with r‘ound- nosed tools when using a fine feed, thus substituting, for a considerable portion of the work, COARSE FEEDS AND 1-non srnnns for our old maxim of coansn FEEDS AND snow srnnns.

45 (N) In 1894 and 1895, the discovery that a greater proportional gain could be made in cutting soft metals through the use of tools made from self-hardening steels than in cutting hard metals,the gain made by the use of self-hardening tools over tempered tools in cutting soft cast iron being almost 90 per cent, whereas the gain in cutting hard steels or hard cast iron was only about 45 per cent. Up to this time, the use of Mushet and other self-hardening tools had been almost exclusively confined to cutting hard metals, a few tools made of Mushet steel being kept on hand in every shop for special use on hard cast- ings or forgings which could not be cut by the tempered tools. This experiment resulted in substituting self-hardening tools for tempered tools for all “ roughing work” throughout the machine shop.

46 (P) In 1894 and 1895, the discovery that in cutting wrought iron or steel a heavy stream of water thrown upon the shaving at the nose of the tool produced a gain in the cutting speed of SELF-HARDEN- mo TOOLS of about 33 per cent. Up to this time the makers of self- hardening steel had warned users never to use water on the tools.

47 (Q) From 1898 to 1900, the discovery and development of the Taylor-White process of _treating tools; namely, the discovery that tools made from chromium—tungsten steels when heated to the melting point would do from two to four times as much work as other tools. This is the discovery of modern high-speed tools.

48 (R) In 1899- 1902, the development of our slide rules, which are so simple that they enable an ordinary workman to make practical and rapid everyday use in the shop of all the laws and formulae deduced from our experiments.

49 (S) In 1906, the discovery that a heavy stream of water poured directly upon the chip at the point where it is being removed from CAST IRON by the tool would permit an increase in cutting speed, and therefore, in the amount of work done, of 16 per cent.

(T) In 1906, the discovery that by adding a small quantity of vanadium to tool steel to be used for making modern high speed chromium-tungsten tools heated to near the melting point, the red hardness and endurance of tools, as well as their cutting speeds, are materially improved.

51 We regard as of by far the greatest value  our mathematical work  on experimental data which has resulted in the development of the slide rules; i. e., the mathematical expression of the exact effect upon the cutting Speed of such elements as the shape of the cutting edge of the tool, the thickness of the shaving, the depth of the cut, the quality of the metal being cut and the duration of the cut, etc. This work enables us to fix a daily task with a definite time allowance for each workman who is running a machine tool, and to pay the men a bonus for rapid work.

52 The gain from these slide rules is far greater than that of all the other improvements combined, because it accomplishes the original Object, for which in 1880 the experiments were started; i. e., that of  superseding “ rule of thumb” by scientific control.

53 By far the most difficult and illusive portion of this work has been the mathematical side: first, finding simple formula: which expressed with approximate accuracy the effect of each of the numer ous variables upon the cutting speed; and, second, finding a rapid method of using these formulae in the solution of the daily machine shop problems.



63 In the second portion of this paper will be given in detail a statement of the appliances, methods and principles which we believe to be necessary to use in order to obtain reliable results. For the pur- pose of a. more general discussion of the subject, however, it seems important to anticipate this portion of the paper by describing in detail the standard which we have finally adopted as a true criterion for determining the effect of each of the variables upon the cutting speed.

64 The efect of each variable upon the problem is best deter- mined by finding the exact rate of cutting speed (say, in feet per minute) which shall cause the tool to be completely ruined after having been run for 20 minutes under uniform conditions.

65 For example, if we wish to investigate the effect which a change in the thickness of the feed has upon the cutting speed,~it is necessary to make a number of tools which are in all respects uniform, as to the exact shape of their cutting edge, their clearance and lip angles, their chemical composition and their heat treatment. These tools must then be run one after another, each for a period of 20 minutes, throughout which time the cutting speed is maintained exactly uniform. Each tool should be run at a little faster cutting speed than its predecessor, until that cutting speed has been found which will cause the tool to be completely ruined at the end of 20 minutes (with an allowance of a minute or two each side of the 20-minute mark). In this way that cutting speed is found which corresponds to the particular thickness of shaving which is under investigation.



66 A change is then made in the thickness of the shaving, and another set of 20-minute runs is made, with a series of similar uniform tools, until the cutting speed corresponding to the new thickness of feed has been determined; and by continuing in this way all of the cutting speeds are found which correspond to the various changes of feed. In the meantime, every precaution must be taken to maintain uniform all the other elements or variables which affect the cutting speed, such as the depth of the cut and the quality of the metal being cut; and the rate of the cutting speed must be frequently tested during each 20-minute run to be sure that it is uniform.

67 The cutting speeds corresponding to varying feeds are then plotted as points upon a curve, and a mathematical expression is found which represents the law of the effect of feed upon cutting speed. We believe that this standard or method of procedure constitutes the very foundation of successful investigation in this art; and it is from this standpoint that we propose to criticise both our own experiments and those made by other investigators. For further discussion of our standard method of making experiments see Par. 137.

68 It was only after about 14 years’ work that we found that the best measure for the value of a tool lay in the exact cutting speed at which it was completely ruined at the end of 20 minutes. In the meantime, we had made one set of experiments after another as we successively found the errors due to our earlier standards, and realized and remedied the defects in our apparatus and methods; and we have now arrived at the interesting though rather humiliating con- clusion that with our present knowledge of methods and apparatus, it would be entirely practicable to obtain through four or five years of experimenting all of the information which we have spent 26 years in getting.

69 The following are some of the more important errors made by us:

70 We wasted much time by testing tools for a shorter cutting period than 20 minutes, and then having found that tools which were apparently uniform in all respects gave most erratic results (particularly in cutting steel) when run for a shorter period than 20 minutes; we erred in the other direction by running o.ur tools for periods of 30 or 40 minutes each, and in this way used up in each single experi- ment so much of the forging that it was impossible to make enough experiments in cutting metal of uniform quality to get conclusive results. We finally settled on a run of 20 minutes as being the best all-round criterion, and have seen no reason for modifying this conclusion up to date. 

71 We next thought a proper criterion for judging the effect of a given element upon the cutting speed lay in determining the particular cutting speed which would just cause a tool to be slightly discolored below the cutting edge at the end of the 20 minutes. After wasting six months in experimenting with this as our standard, we found that it was not a true measure; and then adopted as a criterion a certain definite dulling or rubbing away of the cutting edge. Later it was found, however, that each thickness of feed had corresponding to it a certain degree of dullness or injury to the cutting edge at which point regrinding was necessary (the thicker the shaving the duller the tool should be before grinding); and a third series of experiments was made with this as a standard. While experimenting on light forgings a standard dullness of tool was used which was just sufficient to push the forging and tool apart and so slightly alter the diameter of the work.‘ All of these criterions were discarded, however, when in 1894 we finally bit upon the true standard, above described, of completely ruining the tool in 20 minutes.

72 As will be pointed out later in the paper, this standard demands both a very large and expensive machine to experiment with, and also large, heavy masses of metal to work upon, which is unfortunate; but we believe without apparatus and methods of this kind it is out of the question to accurately determine the laws which are sought. See paragraphs 210-263.

73 Experiments upon the art of cutting metals (at least those experiments which have been recorded) have been mainly undertaken by scientific men, mostly by professors. It is but natural that the scientific man should lean toward experiments which require the use of apparatus and that type of scientific observation which is beyond the scope of the ordinary mechanic, or even of engineers unless they have been especially trained in this kind of observation. It is perhaps for this reason more than any other that in this art several of those elements which are of the greatest importance have received no atten- tion from experimenters, while far less fruitful although more complicated elements, have been the subject of extended experiments.

74 As an illustration of this fact we would call attention to two of the most simple of all of the elements which have been left entirely untouched by all experimenters, namely: a the effect of cooling the tool through pouring a heavy stream of water upon it, which results in a gain of 40 per cent in cutting speed; b the effect of the contour or outline of the cutting edge of the tool upon the cutting speed, which when properly designed results in an equally large percentage of gain.

-------------------

The problem before us may be again briefly stated to consist cf a careful study of the effect which each of the twelve following variable elements has upon the selection of the cutting speed and feed and therefore on the cutting time.

a. The quality of the metal which is to be cut, i. e., its hardness or other qualities which affect the cutting speed;
b. The diameter of the work;
c The depth of the cut, or one-half of the amount by which the forging or casting is being reduced in diameter in turning;
d. The thickness of the shaving, or the thickness of the spiral strip or band of metal which is to be removed by the tool, measured while the metal retains its original density ; not the thickness of the actual shaving, the - metal of which has become partly disintegrated; e The elasticity of the work and of the tool;
f. The shape or contour of the cutting edge of the tool, together with its clearance and lip angles;
g. The chemical composition of the steel from which the tool is made, and the heat treatment of the tool ;
h. Whether a heavy stream of water, or other cooling medium, is used on the tool;
j. The duration of the cut, i. e., the time which a tool must last under pressure of the shaving without being reground; '
k. The pressure of the chip or shaving upon the tool;
l. The changes of speed and feed possible in the lathe; m The pulling and feeding power of the lathe at its various speeds.


The ultimate object of all experiments in this field is to learn how to remove the metal from our forgings and castings in the quickest time, and that therefore the art of cutting metals may be briefly defined as the knowledge of how, with the limitations caused by some and the opportunities offered by others of the above twelve variable elements, in each case to remove the metal with the highest appropriate cutting speed.

 137 Before entering upon the details of our experiments, it seems necessary to again particularly call attention to the fact that “standard cutting-speed” is the true criterion by which to measure the


To give another illustration of our practical use of this standard. If, for example, we wish to determine which make of tool steel is the best, we should proceed to make from each of the two kinds to be tested a set of from four to eight tools. Each tool should be forged from tool steel, say, 5- inch x 1§ inch and about 18 inches long, to exactly the same shape, and after giving the tools made from each type of steel the heat treatment appropriate to its chemical composition, they should all be ground with exactly the same shaped cutting edge and the same clearance and lip angles. One of the sets of eight tools should then be run, one tool after another, each for a period of 20 minutes, and each at a little faster cutting speed than its predecessor, until that cutting speed has been found which will cause the tool to be completely ruined‘ at the end of 20 minutes, with an allowance of a minute or two each side of the 20-minute mark.


Every precaution must be taken throughout these tests to maintain uniform all of the other elements or variables which affect the cutting speed, such as the depth of the cut and the quality of the metal being cut. The rate of the cutting speed must be frequently tested during each 20-minute run to be sure that it is uniform throughout.

Throughout this paper, “the speed at which tools” give out in 20 minutes, as described above, will be, for the sake of brevity, referred to as the “standard speed.” ~ 141 After having found the -“standard speed” of the first type of tools, and having verified it by ruining several more of the eight tools at the same speed, we should next determine in a similar manner the exact speed at which the other make of tools will be ruined in 20 minutes; and if, for instance, one of these sets of tools exactly ruins at a cutting speed of 55 feet, while the other make ruins at 50 feet per minute, these “standard speeds," 55 to 50, constitute by far the most important criterion from which to judge the relative economic value of the two steels for a machine shop.


https://babel.hathitrust.org/    cgi/ssd?      id=mdp.39076000032131

About Carl Barth
https://www.naha.stolaf.edu/pubs/nas/volume13/vol13_7.htm




Ud. 3.4.2026
Pub. 28.5.2020

C.B. Going 1911 - Text Book - Principles of Industrial Engineering - Cost Reduction and Cost Management by Industrial Engineers

 


Essay by Narayana Rao K.V.S.S. based on the book by C.B. Going.

What is industrial engineering?


Industrial engineering is the applied science of management. It directs the efficient conduct of manufacturing, construction, transportation, or even commercial enterprises of any undertaking, indeed, in which human labor is directed to accomplishing any kind of work.

Emphasis: It directs the efficient conduct of manufacturing, construction, transportation and other areas of engineering related work.

It is of very recent origin. It is only just emerging from the formative period. Its elements have been proposed during the past one or two decades. The conditions that have brought into being this new applied science, this new branch of engineering, grew out of the rise and enormous expansion of the manufacturing system.

Emphasis: Elements of Industrial Engineering - The best way of accomplishing elements of operations/processes using machines and men. Many elements are common among operations/processes. Industrial engineering has to measure and develop the best way of doing a work element based on various criteria. Time and cost are two important measures.

Industrial engineering has drawn upon mechanical engineering, upon economics, sociology, psychology, philosophy, accountancy, to fuse from these older sciences a distinct body of science of its own. It provides guidelines or direction to the work of operatives, using the equipment provided by the engineer, machinery builder, and architect.

The cycle of operations which the industrial engineer directs starts with money which is converted into raw materials and labor (machine and man); raw materials and labor are converted into finished product or services of some kind; finished product, or service, is converted back into money. The difference between the first money and the last money is (in a very broad sense) the gross profit of the operation. The starting level (that is, the cost of raw materials and labor) and the final level (the price obtainable for finished product) these two levels are generally fixed by competition and market conditions. Profit of the operating cycle varies with the volume passing from level, to level. Higher volumes lead to greater profits. But with the efficiency of the conversions between these levels also determines the profits. In the case of a hydroelectric power-plant, there are conversion losses like  hydraulic, mechanical  and electrical. In industrial enterprises the conversion losses are in commercial, manufacturing, administrative and human operations. It is with the efficiency of these latter conversions that industrial engineering is concerned.

Emphasis: Industrial engineering is concerned with technical losses and losses due to human operations (manufacturing and human operations).

The central purpose of  industrial engineer  is efficient and economical production. He is concerned not only with the direction of the great sources of power in nature, but with the direction of these forces as exerted by machinery, working upon materials, and operated by men. It is the inclusion of the economic and the human elements especially that differentiates industrial engineering from the older established branches of the profession. To put it in another way : The work of the industrial engineer not only covers technical counsel and superintendence of the technical elements of large enterprises, but extends also over the management of men and the definition and direction of policies in fields that the financial or commercial man has always  considered exclusively his own.



Emphasis: The central purpose of  industrial engineer  is efficient and economical production. He has to do productivity engineering and productivity management based on productivity science.



Going in his 1911 book on Industrial engineering indicated six cardinal areas for efficiency improvement, the objective of industrial engineering. Going, includes the current practices of his period and the issues that require further improvement. Going includes in his book, many ideas proposed by Taylor, Gilbreth and Emerson as implemented already in the manufacturing departments and advocates some more issues which were proposed by the pioneers of industrial engineering, but not yet widely adopted.


They are:

1. The form of management;
2. The determination and direction of operations, or manufacturing methods; 
3. The provision and custody of material; 
4. The handling and payment of labor or men; 
5. The care and maintenance of tools and machinery; 
6. The recording of expenditures and costs that is, of money. 


1. The form of management;

Ideals and principles are fundamental and fixed; methods and systems must vary with conditions. The systems that will succeed in any given case depend on the organization adopted in, and the circumstances surrounding, that case. Many misfits and troubles have resulted from attempts to force cut-and-dried systems that had succeeded under one set of conditions and in one environment, upon a plant differently organized and environed to which these systems were not adapted at all. There are, nevertheless, fixed principles that can be formulated and should be observed in any system we may adopt in any individual case.


Management,  is presently dominated too exclusively by ideals of "line" subdivision with insufficient " staff " co-ordination. There is "three-column form" of organization; that is, the management is carried on by three co-ordinated departments financial, manufacturing, and commercial. The division is elementary and logical. First get your money, next turn it into manufactured wares, then sell the product.  All effective work in the improvement of efficiency requires "functional force" i.e, "co-ordinating line organization with  expert staff."

2. The determination and direction of operations, or manufacturing methods; 

The direction of methods is in an unsatisfactory condition. Both the machine related method and operator method are left sometimes to the men running the machines, sometimes to their foreman, sometimes to the drafting room, and sometimes to the engineering department or mechanical department at large. The knowledge of the most efficient operation of machines is not there in any person in the current organizations. Taylor, recommended number of steps to be taken in the activity of  efficient operation of some machine tools. It has to be extended to more machine tools and other machines. Here is another broad field for the staff specialist involved in efficiency improvement.

3. The provision and custody of material; 

Materials are generally supplied through a purchasing department, whose duty it is to provide all materials and supplies in the quantity and quality required by the production department, at the most advantageous price possible; and to verify its purchases to the auditing department for payment. Materials when received pass into the custody of the stores department, at the head of which is an official known as the storeskeeper or storekeeper. In a large plant there will probably be a general storeskeeper and a sufficient number of division or assistant storeskeepers and clerks to handle the work. The duty of the stores department is to keep materials in safe custody and orderly arrangement, to supply them to the departments of the factory on requisitions from proper authority, to account for their issue, to receive them again, in partly finished or finished condition, if the routine of the factory operation so requires, and to maintain an inventory of all material on hand. Sometimes finished product is delivered from stores on order of the sales department; sometimes the shipping department is distinct. Obviously both purchasing department and stores department must be in close touch with the needs of the production department, but the discretion given either of them to query or to anticipate production-department requisitions or wants varies greatly in different cases, and may be determined by the policy of the concern or the personality of the officials chiefly concerned. It is not uncommon, however, for the stores department to be charged with responsibility for maintaining at all times a sufficient stock not only of raw materials but of finished product. The manufacturing department then works always and only upon orders issued by the stores department.

The records of materials are usually kept by requisitions made out in multiple, separate copies going to the manufacturing and accounting officials immediately concerned, and by entering each addition or withdrawal in books or on cards accompanying each lot or kind of material carried in stock. The movement of material through the factory is usually directed and recorded by tags, accompanying each piece or lot, and distinguished by serial numbers connecting them with the order or job to which they apply. Multiple copies of these memoranda, sent ahead, serve to notify responsible officials further down the line what to look for, and act as detectors for any delay or discrepancy in arrival. This system is commonly called stock tracing.


Material in process of manufacture is commonly called either stock or stores. The terms are rather loosely used, but the best authority prescribes the use of the term " stores " for raw material and " stock " for finished product. This usage, however, is not universal, and very often " rough stores " or " raw stores " is used to designate unmanufactured material, and " finished stores," manufactured material. Material is an important area for industrial engineers to investigate various decisions and practices to increase efficiency.

4. The handling and payment of labor or men; 

Labor is very diversely managed. Some large concerns have a regular labor department or employment agency where applications are filed and examined, and by which men are engaged in such numbers and at such times as, the managing officials direct. In other cases the heads of departments make their own engagements and discharges. Usually the discipline and work assignments of each employee depend upon his immediate superior, who may be a very minor official, such as a gang boss or sub-foreman. Many disciplinarians consider that the power of promotion or discharge is necessary to the man in immediate command. There are, however, great dangers of injustice, and of the exercise of favoritism or spite disastrous to efficiency of the working force as a whole, if too much power is entrusted to petty officers. I think this is on the whole the safer view to adopt. The assignment of work, even, when not determined by general routine, is now sometimes advantageously directed from a central works office, where a work dispatcher has every machine in the shop displayed before him on a board, with its jobs in hand or accumulated systematically tabulated on slips, and he directs the next movement for each man and machine on the floor, as a train dispatcher moves the trains on a railroad.


The individual jobs are usually designated by numbers connecting them with the work to which they apply. The time each man works is usually recorded by a representative of the accounting or auditing or cost department, called a time clerk or a timekeeper. Very generally each workman registers his entrance and departure by punching a time clock or some similar automatic recording device, so that
the total time for which he is paid is indisputable. The division of his time among various jobs (if his work is of such character that it is divided among several jobs) is noted either by himself, by his foreman, or by the time clerk, who then makes frequent rounds of the shop and visits every man often enough to keep close track. These time records, like the material records, are usually kept on individual cards, which can be assembled afterwards for such tabulations and cost determinations as are desired and may be kept as long as deemed advisable for further reference. The system of payment is determined by the management in the light of such appreciation as the managers may have of the virtue and benefits of the several advanced wage systems, and under such limitations as the prejudices of the men or the effective restriction of the union may require. The ideas of Taylor and Gilbreth can be seen in Going's description of practices.

5. The care and maintenance of tools and machinery; 

The fifth cardinal area for industrial engineering is  the care and maintenance of tools and machinery. The larger mechanical equipment, power transmission, etc., is too often left more or less vaguely to the engineering or mechanical department, from whom it devolves upon the foremen. There is, however, a generally recognized and almost universally established institution called the tool room (advocated by Taylor), which has two separate functions; one is the custody and issue of small tools, which are provided, ground, kept in order, and given out to the men as needed, account being kept by hanging a brass check representing the tool on a hook bearing the workman's number. The other and larger function 'of the tool room is the making of standard and special tools, jigs, fixtures, etc., and the repair of machines and machinery. The knowledge of the mechanical department given the responsibility of care and maintenance of machinery is not deep enough and also the principal causes of waste and loss of time are not investigated and science is developed.  Here is an opportunity for most profitable use of the industrial engineering specialist to increase efficiency of the organization.

6. The recording of expenditures and costs that is, of money. 

The cost department receives  time and material cards which are verified by auditors as necessary.  They are sorted by numbers so that all cards belonging to any particular job, machine, or desired item of product fall together. From these the complete material and labor cost of any piece or product (or by proper prearrangement, of any part of a unit of product or of any operation upon any part) can be figured up and recorded. It is part of the function of the cost department  to connect expenditures with certain manufacturing accounts. It also determines by comparison whether the expenditure and the production value achieved are in fair proportion. The production value has to be higher than the expenditure incurred.   The cost department should compare each individual operator's time on each job with recorded times made by other men on the same jobs. If he has been soldiering (producing less by working deliberately slowly) and has done altogether in 60 hours only what the records show that other men have previously done in 25 hours, the facts are made clear and proper action can be taken. The cost department, properly conducted, may thus become a mine of valuable information for industrial engineering department to understand the cost incurred in each production step and the relation between engineering decisions and resultant cost. It provides estimate for the possible cost savings for the modifications proposed by industrial engineering department. It also supports shop superintendent to find the comparative worth of his men. It supports  the commercial or sales organization by showing  what margin of profit currently exists and affords a guide to possibilities of meeting competition. It also permits close estimates to be made on new work, by a comparison with similar jobs in the past. Industrial engineers have to take interest in cost recording and analysis as it provides them cost measurement or cost information to drive their cost reduction activity.

We have the basic books by Taylor, Gilbreth and Emerson by 1911. Hugo Dimer and C.B. Going wrote books on industrial engineering and factory administration by synthesizing the writings of pioneers. Dimer also gave his interpretation of industrial engineering as expressed by Taylor. Industrial engineering evolved over the last 100 years on these foundations.  Machine related work did not get the attention that is required in industrial engineering curriculum. It was pointed out by Walter Rautentraunch in 1908 itself. But the correction did not take place. Operations research groups became dominant to strengthen the weak industrial engineering discipline due to its exclusive focus on operators' activity. But the real reason for weakness of industrial engineering is neglect of engineering component of engineering systems for increasing efficiency. Japanese experts on scientific management and industrial engineering have made significant progress in the engineering improvement area. SMED, Pokayoke and TPM are all innovations in engineering areas. One can see TPM actually reflecting the ideas given by Going.

Machine work study is now proposed to create special focus on machine work in industrial engineering discipline.




Posts on Material from Going's Book

Industrial Engineering - The Concept - Developed by Going in 1911














Chapter 6









Chapter 7






Chapter 9