Estimate the manual assembly time and design efficiency for the shaft assembly s

Question

Estimate the manual assembly time and design efficiency for the shaft assembly shown in Figure 3. 57. The assembly procedure is as follows: The retainer bush is placed in the work fixture. The shaft is inserted in the bush. The securing screw is inserted into the bush and is difficult to align and position. The spring tangles severely and, when separated from others, is dropped onto the shaft. The washer is inserted onto the shaft and then held down while the snap fastener is positioned using a standard grasping tool.

Explanation / Answer

1) Time Calculation for each part:-

a) Instert Shaft in a bush ti = 1.4L + 1.5

= 1.4 * 50 + 1.5

= 71.2 ms

b) Insert Screw = 1.4 * 2 + 1.5

= 4.3 ms ( Consider 5 % time required for fimement)

= 4.515 ms

c) Spring time = 1.4 * 40 + 1.5

= 57.5 ms (Consider 5 % extra for adjustment )

= 60.3 ms

d) Washer fiment = 1.4 * 1.5 + 1.5

= 3.6 ms

e) Snap fastner = 1.4 * 1 + 1.5

= 2.9 ms + 8.5 % consider for gripping tool

= 3.14 ms

Total Time = 142.7 sec

Efficiency = Number of parts * basic time for one part / Total time

= 5 * 3.6 / 142.7 (basic time consider which have no assy difficulties )

= 13 %

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