# Week 6 Assignment Problems 14.2, 14.3 and 14.9

Week 6 Assignment

PROBLEM
14.2
Using the product
structure for Alpha in Solved Problem 14.1, and the following lead times,
quantity on hand, and master production schedule, prepare a net MRP table for
Alphas.

ITEM

QUANTITY ON HAND

Alpha

1

10

B

2

20

C

3

0

D

1

100

E

1

10

F

1

50

Master Production Schedule for Alpha

PERIOD

6

7

8

9

10

11

12

13

Gross
requirements

50

50

100

PROBLEM 14.3
Hip Replacements, Inc.,
has a master production schedule for its newest model, as shown below, a setup
cost of \$50, a holding cost per week of \$2, beginning inventory of 0, and lead
time of 1 week. What are the costs of using lot-for-lot for this l0-week
period?
SOLUTION
Holding cost = \$0 (as
there is never any end-of-period inventory)
Ordering costs = 4
orders × \$50 = \$200
Total cost for
lot-for-lot = \$0 + \$200 = \$200

Problem 14.9
Products, Inc., has just provided you with the schedule and lead times for the
bracket in Problem 14.8. The unit is to be prepared in week 10. The lead times
for the components are bracket (1 week), base (1 week), spring (1 week), clamp
(1 week), housing (2 weeks), handle (1 week), casting (3 weeks), bearing (1
week), and shaft (1 week).
a) Prepare the time-phased product structure for
the bracket..5in;’=”” list=”” lfo1;=”” level1=”” l1=”” baseline;=”” 0pt;=”” 0in;=”” “calibri”,”sans-serif”;=”” 18pt;=”” 0);=”” 0,=”” rgb(0,=””>b) In what week do you need to start the
castings?Problem 14.13Electro Fans has just
received an order for one thousand 20-inch fans due week 7. Each fan consists
of a housing assembly, two grills, a fan assembly, and an electrical unit. The
housing assembly consists of a frame, two supports, and a handle. The fan
assembly consists of a hub and five blades. The electrical unit consists of a
motor, a switch, and a knob. The following table gives lead times, on-hand
inventory, and scheduled receipts.
a) Construct a product structure..5in;’=”” list=”” level1=”” baseline;=”” 0pt;=”” 0in;=”” “calibri”,”sans-serif”;=”” 18pt;=”” 0);=”” 0,=”” rgb(0,=”” lfo2;=”” l0=””>b) Construct a time-phased product structure..5in;’=”” list=”” level1=”” baseline;=”” 0pt;=”” 0in;=”” “calibri”,”sans-serif”;=”” 18pt;=”” 0);=”” 0,=”” rgb(0,=”” lfo2;=”” l0=””>c) Prepare a net material requirements plan.ReferenceHeizer, Jay, and Barry
Render. Operations Management, 11th Edition. Pearson Learning
Solutions, 2013. VitalBook file.

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