Solution-HW2.pdf - Cycle Time Analysis of Manual Work 2.1...

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Cycle Time Analysis of Manual Work 2.1 If the normal time is 1.30 min for a repetitive task that produces one work unit per cycle, and the company uses a PFD allowance factor of 12%, determine (a) the standard time for the task and (b) how many work units are produced in an 8-hour shift at standard performance. Solution : (a) T std = 1.30(1 + 0.12) = 1.456 min (b) Q std = 8(60)/1.456 = 329.7 pc (if rounded, 329 pc) 2.3 The normal time to perform a certain manual work cycle is 3.47 min. In addition, an irregular work element whose normal time is 3.70 min must be performed every 10 cycles. One work unit is produced each cycle. The PFD allowance factor is 14%. Determine (a) the standard time per piece and (b) how many work units are produced during an 8-hour shift at 100% performance, and the worker works exactly 7.018 hr, which corresponds to the 14% allowance factor. (c) If the worker’s pace is 120% and h e works 7.2 hours during the regular shift, how many units are produced? Solution : (a) T std = (3.47 + 3.70/10)(1 + 0.14) = 4.378 min
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