Question: The snapback method was used to time study a worker machine cycle consisting of elements a, b, and c. Elements a and b are worker-controlled

The snapback method was used to time study a worker machine cycle consisting of elements a, b, and c. Elements a and b are worker-controlled and were performance rated at 100% during the time study. Element c is machine-controlled, Elements b and c are performed simultaneously. The PFD allowance is 12 % and the machine allowance is 10%. One work piece is produced each cycle. Determine (a) the normal time, (b) the standard time for the cycle, (c) the number of pieces completed if the worker works 7 hr and 10 min during an 8 hour shift, and his performance level is 135 %.

Element a b c

Obser. time 1.25 .90 .80

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