For a worker-machine task, the continuous-timing method was used to obtain the times indicated in the table below. Element c is a machine-controlled element and the time is constant. Elements a, b, d, and e are operator-controlled and were performance rated at 100%; however, element d is performed during the machine-controlled element c. The machine allowance is 16%, and the PFD allowance is 16%. Determine (a) the normal time and (b) standard time for the cycle. (c) If the operator works at 140% of standard performance in production and two parts are produced each cycle, how many parts are produced if the total time worked during an 8-hour day is 7.4 hours? (d) For the number of parts computed in (c), what is the worker’s efficiency for this shift?
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Element a, b, c, d, e
Observed time (min) 0.30, 0.65, 1.65, 1.90, 2.50
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