Question: The following data is from a time study taken on a horizontal milling machine: Pieces produced per cycle: 1 Mean manual effort time per cycle:

The following data is from a time study taken on a horizontal milling machine:

Pieces produced per cycle: 1

Mean manual effort time per cycle: 4.62 minutes

Mean cutting time (power feed): 3.75 minutes

Mean performance rating for the operator: 100%

Machine allowance (power feed): 10%

Fatigue allowance: 15%

To calculate the standard time allowed for this task you need to separate the manual & machine time and then divide by the number of units produced per cycle. In the following table, calculate the manual Normal Time (NT) and Standard Time (ST) and the Machine Normal Time (MNT) and the Machine Standard Time (MST) and then divide this by the pieces per cycle

	Manual		Machine	ST for Manual & Machine	Standard Time
Observed Time	4.62 min.		3.75 min.
X RF	X 1.15		X 1.00
= Normal Time	?		?
X (1 + A)	X (1 + .15)		X (1 + .10)
= Standard Time	?	+	?	ST/pieces per cycle	?

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