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# 1) A production manager must determine the processing

### Customer Question

1) A production manager must determine the processing sequence for seven jobs through the grinding and deburring departments. The same sequence will be followed in each department. The manger’s goal is to move the job through the two departments as quickly as possible. The site supervisor of the grinding department wants the SPT rule to be used to minimize the work-in-process inventory in his department. process inventory in his department.
Processing Time (Hours)
Job Grinding/ Deburring
A 3 /6
B 2 /4
C 1 /5
D 4 /3
E 9 /4
F 8 /7
G 6 /2
Requirements:
a. Prepare a schedule using the SPT priority rule for the grinding department (using the grinding times).
b. What is the total flow time in the grinding department for the SPT sequence? What is the make-span for the seven jobs in both the grinding and deburring departments (using the sequence found in part a)?
c. Determine a sequence that will minimize the make-span in both departments. Does using the SPT rule in the grinding department result in smallest make-span?
2) Use Microsoft Excel or word document to solve this problem.
A company produces sofas. The manager wants to prepare a plan for the next six months using the information:
Month 1 2 3 4 5 6
Forecast Demand 160 150 160 180 170 140
Cost Per Unit
Regular time \$100
Overtime \$150
Part time \$120
Inventory, per month \$10
Backorder, per month \$50
There are 5 workers, each making 30 sofas a month. The maximum number of sofas produced during overtime is 30 per month. Part-time workers can handle a maximum of 20 units per month. Beginning inventory is zero. Develop a plan that minimizes total cost. No ending inventory or backorders are desired at the end of month 6.
3) Explain each of the following terms with an example:
a) Time fences
b) Available to promise inventory
c) Takt time
d) Bill of materials
4) A flower shop uses 250 clay pots a month. The pots are purchased for \$2 each.
Annual holding cost is estimated to be 30 percent of purchase cost, and ordering cost is \$20 per order. The manager has been using an order quantity of 250 flower pots.
a. Calculate the EOQ.
b. Calculate the EOQ’s total annual inventory control cost.
c. What additional annual inventory control cost is the shop incurring by using the current order quantity?
Submitted: 1 year ago.