TMU. Most predetermined motion time systems (MTM and MOST) use time measurement units (TMU) instead of seconds for measuring time. One TMU is defined to be 0.00001 hours, or 0.036 seconds.
The 17 Basic MTM-1 Motions
Chapter 5
REACH is the basic element employed when the predominant purpose is to move the hand and/or fingers to a destination or general location.
The predominant purpose of the motion is the deciding factor in classifying it as a reach. Holding or palming a light, small item such as a screw- driver, pliers, or scissors while moving the hand does not justify classifying the motion as a move rather than a reach. For example, in the needle trades, a scissors is often held in the palm of the hand while other operations such as reaching from the cloth on the working area in front of the operator to a bin containing pins are performed. The motion to the bin should be classified as a reach if the predominant purpose is to get the hand in a position to pick up some pins for the next operation.
Chapter 6
Move
Definition
MOVE is the basic element employed when the predominant purpose is to transport an object to a destination.
The predominant purpose of the motion is the deciding factor in classifying it as either a reach or a move. If the hand holds an object as an incidental fact to the reason for the motion, a reach will be performed. Basically, then, the decision as to predominant purpose hinges on the reason for moving the hand—was it to relocate the hand, or was it to relocate the object? Answering this question will clarify the kind of transport motion involved.
Turn may be defined as follows:
Turn is the motion employed to turn the hand either, empty or loaded by a movement that rotates the hand, wrist, and forearm about the long axis of the forearm.
https://babel.hathitrust.org/cgi/pt?id=mdp.39015003722058&view=1up&seq=156&skin=2021
Engineered work measurement; the principles, data, and techniques of methods-time measurement, modern time and motion study, and related applications engineering data, by Delmar W. Karger and Franklin H. Bayha.,
CHAPTER 9 Turn
Definition
TURN is the basic motion employed to revolve the empty or loaded hand by an action which rotates the hand, wrist, and forearm about the long axis of the forearm. While pure Turns as defined above do sometimes occur in industrial operations, they occur more frequently in combination with Reaches and Moves. This fact has led to statements by some sources that Turn is a special way of performing a Reach or Move. Such is not the case. While it is true that Moves and Reaches may include performance of the basic motion Turn, this does not preclude the ability of the worker to accomplish pure Turns alone.
CHAPTER 10
RELEASE LOAD
The basic element that requires the shortest time of any to perform is Release Load. Values of 1.7 TMU and 0 TMU have been assigned to the two cases thus far established. Undoubtedly the value of 1.7 TMU is high. It was obtained as the result of the measuring procedure employed when collecting data. Even in slow-motion pictures, Release Load is often found to consume only one or two sixty-fourths of a second, which would give values of approximately .4 or .8 TMU.
Release Load is so quick that its presence must usually be determined by analysis rather than by observation. In compiling the methods-time data, it was thought possible that Release Load might be ignored altogether in application. It was found after numerous checks with and without recognizing Release Load that the accuracy of the results was somewhat increased by including time for releasing. This may be attributable to the manner in which the data were compiled, i.e., time may have been assigned to Release Load which actually belongs to Move and Reach. Regardless of this, however, since the recognition of Release Load increases the accuracy of the methods-time data in application in their present form, it should be included in the manner outlined below.
DEFINITION OF RELEASE LOAD
Release Load is the basic element employed to relinquish control of an object by the fingers or hand.
The opening of the fingers, or hand, permitting the part to be free, as shown by Fig. 53, is the motion employed. It should be noted that, like Grasp, the definition limits the basic element of Release Load to releases which are performed with the hand only. If a part is released by opening a pair of tongs, it is accompanied by performing the basic element Move.
CHAPTER 11
DEFINITION OF DISENGAGE
Disengage is the basic element employed to break the contact between one object and another, and it is characterized by an involuntary movement occasioned by the sudden ending of resistance.
chapter 12
Walking
Operations that involve walking occur frequently in industry. Therefore a detailed study of walking time and methods is necessary if the method-time data are to be applied to this class of work.
MTM Maynard et al. 1948 Book chapters - Partial list
Source
https://babel.hathitrust.org/cgi/pt?id=mdp.39015003722058&view=1up&seq=130&skin=2021
Engineered Work Measurement: The Principles, Techniques, and Data of Methods-time Measurement Background and Foundations of Work Measurement and Methods-time Measurement, Plus Other Related Material
Delmar W. Karger, Franklin H. Bayha
Industrial Press Inc., 1987 - Work measurement - 503 pages
Includes extensive information on I.E. and work measurement software. Focuses on the MTM material that has been refined for more than three decades. Provides accurate answers to all questions regarding MTM-1 found in the MTM Association for Standards and Research MTM-1 Examinations. Covers the minimum work measurement background essential to all who must understand and apply MTM-1.
https://books.google.co.in/books?id=K-JSTQ0tkkkC
MOST Work Measurement Systems, Third Edition,
K. B. Zandin
CRC Press, 19-Dec-2002 - Technology & Engineering - 552 pages
This book is an essential guide for those in training for their MOST® certification and a great value to anyone looking to enhance their marketability to prospective employers. Revised to accommodate the evolving needs of current and emerging industries, the third edition clarifies the working rules and data card format for BasicMOST®, MiniMOST® and MaxiMOST®, presents a thorough description of the application of AdminMOSTTM, a version of BasicMOST® for measuring administrative tasks in retail, banking and service environments, and contains new photographs and illustrations. It is an excellent resource for practicing professionals and newcomers in the fields of industrial engineering and management.
A Long Case Study Using MTM, Therbligs and Process Charts
Improving the process of Assembling and Unassembling an Electric Mosquito Swatter
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Sep 17, 2022
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