Question

A production  process at Kenneth day Manufacturing is show in the figure below. The drilling operation occurs separately  from , and simultaneously with the sawing and sanding ,which are independent sequential operations.  A product needs to go through only one of the three assembly operations ( the operations  are in parallel)

6 units/hrs

Sawing 

2.2 units/ hrs

Sanding

Drilling 

1.8 units/hr

Welding

5 units/hr

Assembly 

0.7 units/hr

Assembly 

0.7 units / hr

Assembly 

0.7 units/hr

A)..........Drilling  or Sanding or sawing or welding  or assembly?.  

B) The bottleneck time is .........minutes per unit (round your response to three decimal places)

C) the throughout time of the overall system is ...........minutes ( round your response to two decimal places)

D) If the firm operates 10 hours  per days ,20 days per month , the monthly   capacity   of the manufacturing process is ..........units (Enter your response as a whole number)

Answer 1

Effective capacity of assembly 0.7+0.7+0.7= 2.1 units per hour

Process	Capacity (units/hour)	Cycle Time in mins= 60 /capacity
Sawing	6	10.00
Sanding	2.2	27.27
Welding	5	12.00
Assembly	2.1	28.57
drilling	1.8	33.33

Answer a: Drilling is a bottleneck because it has a most cycle time

Answer b: bottleneck cycle time is 33.33 mins

Answer c: Throughput time is sum of all process times= sawing + sanding + welding + assembly =10+27.27+ 12+(60/0.7)= 134.98 mins

Answer d: total working hours= 20 days*10 hours per day= 200 hours per month

Production capacity= bottleneck capacity= 1.8 units per hour

Total production per month= total working hours* Production capacity= 200*1.8= 360 units per month