PA 5-5 Consider the following four-step assembly... Consider the following tour-

Question

PA 5-5 Consider the following four-step assembly... Consider the following tour-step assembly operation with quality problems. Each resource is staffed by one employee The first resource has a processing time of 5 minutes per unit Step 1: Step 2 Step 3 The second resource has a processing time of 6 minutes per unit The third resource has aprocessing tirne of 3 minutes per unit With a 30% probability the low unit coming out of the third resource has to be reworked. In that case, the operations at the first, second and third resources are repeated You can assume that (a) rework always succeeds (ie. a unit going through the rework loop will always work after the third resource) and (b) the processing times for units in rework are the same as for regular units Step 4 The fourth resource has a processing time of 4 minutes per unit a. Where in the process is the bottleneck? Step 1 Step 2 O Step 3 O Step 4 (Round your answers to 2 decimal places) b. What is the capacty of the process? good units per hour

Explanation / Answer

Flow capacity of resource 1 = 60/5 = 12 good units per hour

Flow capacity of resource 2 = 60/6 = 10 good units per hour

Flow capacity of resource 3 = 60/3*(1-30%) = 14 good units per hour

Flow capacity of resource 4 = 60/4 = 15 good units per hour

a) Flow capacity of resource 2 is the minimum, therefore, it is the bottleneck.

ANSWER: Step 2

b) Capacity of the process is the same as the capacity of the bottleneck operation. Therefore,

capacity of the process = 10 good units per hour

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