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Online Free Access Handbook of Industrial Engineering includes all modules of IE Online Course Notes.
Lesson 212 of Industrial Engineering ONLINE Course.
Lesson 213 SIMO Chart Using Therbligs - Two Handed Chart for Micro-Motion Study
Lesson 214 Motion Analysis - Two Handed Operation/Process Chart - Operator Motions Chart
Lesson 215 SIMO Chart Analysis
For each step or operation in the process chart - material processing, inspection, handling & transport, warehousing, temporary stocking & delay, when operators are involved, a two-handed process chart is to be prepared for each operator involved. Similar a machine work sheet or chart is also to be prepared to study machine work in the process.
The Two-handed process chart for Motion Study
The two-handed process chart is a process chart in which the activities of a worker's hands (or limbs) are recorded in their relationship to one another
The two-handed process chart shows the two hands (and if the feet are involved, feet also) of the operative moving or static in relation to one another, usually in relation to a time scale.
The two-handed process chart is prepared for analysis of repetitive operations. At least, one complete cycle of the work is to be recorded. Recording of every movement of the hand is recorded.
Symbols and Meanings
O OPERATION Is used for the activities of grasp, position, use, release,
etc., of a tool, component or material.
=> TRANSPORT Is used to represent the movement of the hand (or limb) to
or from the work, a tool or material.
D DELAY is used to denote time during which the hand or limb being charted is idle (although the others may be in use).
▼ HOLD is used to represent the activity of holding the work, a tool or material — that is, when the hand being charted is holding something.
Preparing the chart requires observation and this enables the motion study specialist to gain
an intimate knowledge of the motions involved in the job.
The first step in making an operation chart, or left- and right-hand chart or two-handed chart is to draw a sketch of the work place, indicating the contents of the bins and the location of tools and materials. Then observe the motions of one hand of the operator. Mentally record each motion and then compare the motions and with the mental picture prepared. Then record the motions of that hand and then compare once again. Thus, the motions of one hand, say left hand are observed for number of cycles and the chart is filled on the appropriate side. Then, the other hand is observed, mentally recorded, compared, then it is written on the paper and compared.
Each motion is subjected to questioning from ECRS perspective. From the questioning, improvements are developed. A brain storming group can be formed for the questioning of each motion. The group can be shown some successful motion study examples through videos or printed articles and reports. The ideas that are generated should be written down in chart form when they occur. Different ideas are compared. The best method is generally that which requires the fewest movements.
The two-handed process chart can be applied to assembly as well as component making jobs. In the assembly of small parts with close fits, "positioning" should be shown as a separate movement apart from the actual assembling movement. Attention gets focused on the different movements that way improvements in each movement can be thought of during simplifying activity.
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https://www.youtube.com/watch?v=aw6UVbaojgM
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Application and Case Studies
PRODUCTIVITY IMPROVEMENT ON LAMP ASSEMBLY LINE
Conference Paper · October 2016
Improving The Assembly Process of Down lighter by using Two Hand Process Chart
Kajal Sejpal
International Journal of Engineering and Advanced Technology (IJEAT)
ISSN: 2249 – 8958, Volume-6 Issue-4, April 2017
In this project, productivity is improved by optimizing certain operations of the manual assembly process of a product. In this paper, flow process chart of assembly line of a particular product is
studied. The two hand process chart of selective time consuming operations is carried out. The time saved and improvement to the operations is noted. A new standard process in manual assembly line is created, time is saved as well as energy of the worker is also saved. This leads to increased units of production and lesser fatigue.
https://books.google.co.in/books?id=lHHB-3qayLUC&pg=PA149#v=onepage&q&f=false
Updated on 4 Nov 2021, 26 May 2021, 12 June 2020, 11 September 2016
Updated on 4 Nov 2021, 26 May 2021, 12 June 2020, 11 September 2016
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