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16 Cards in this Set
- Front
- Back
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define motion study |
the study of the body motions employed in performing a job to develop the most efficient work method |
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Why motion study? (4) |
to develop the most efficient work method - eliminate unnecessary motions - simplify necessary motions - facilitate and speed-up effective motions - adopt most favorable motion sequence |
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What is the researchers' motion study method? (2) |
establish motion elements (Therbligs) develop the principles of motion economy |
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What is the engineers' motion study method? (3) |
analyze motion elements in a job apply the principles optimize the work method |
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List the 17 Therbligs (motion elements) |
search, select, grasp, reach, move, hold, release, position, pre-position, inspect, assemble, disassemble, use, unavoidable delay, avoidable delay, plan, rest to overcome fatigue |
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define time study |
a method for determining the "standard time" required by an "average" "fully-qualified" and "well-trained" operator working at a "normal pace" to complete a task |
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Why do time study? (5) |
- establish fair days work - production planning - labor planning - comparison of machine and method effectiveness - health and safety reasons |
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What is the general procedure of a time study? |
Communicate with management Analysis of work methods and materials Break down the job into Therbligs Observe the process Evaluate performance ratings (skill, effort, conditions, consistency) |
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Performance rating = ________ + ________ |
Performance rating = 1 + sum of offsets |
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normal time (average worker) = _______ * ___________ |
normal time = mean observed time * performance rating |
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standard time = ___________ * (1 + ________) |
standard time = normal time * (1 + allowance factor) |
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1 TMU = ___________ |
1 TMU = .036 s |
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describe methods-time measurement (MTM) (2) |
- decompose tasks into elemental motions - use pre-determined timing data of the elemental motions to estimate total task time |
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Move TMU = (______ * ______) + _______ |
Move TMU = (table value) * (weight factor) + constant |
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TMU code crap |
Move symbol + distance + case Move symbol + case |
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Why MTM? |
to predict task time/overcome a limitation of time study |
