Mgt 2070 Assignment #9 Answers

Mgt 2070 Assignment #9 Answers

14.11Given the product structure, master production schedule, and inventory status

a) Develop a gross requirements plan for Item C.

To develop a Gross Requirements Plan for item C, we note from the diagram that one of item C is used in Assembly A and another is used in Assembly H. Note that existing inventories arent taken into account in a gross requirements plan. Our plan should thus show requirements for all three components:

Item123456789101112

AGross Req10050150

Order Rel10050150

HGross Req10050

Order Rel10050

CGross Req1001005050150

Order Rel1001005050150

b) A net requirements plan for Item C.

Our net requirements plan does taken into account existing inventories and provides us with some more detailed quantities. Once again, it should show items A, H, and C:

Item123456789101112

AGross Req10050150

On Hand

Net Req10050150

Planned Receipt10050150

Planned Release10050150

HGross Req10050

On Hand

Net Req10050

Planned Receipt10050

Planned Release10050

CGross Req1001005050150

On Hand5050505050505000000

Net Req501005050150

Planned Receipt501005050150

Planned Release501005050150

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 table on the top of page 607 gives lead times, on-hand inventory, and scheduled receipts.

a)Construct a product structure.The product structure diagram is:

b) The time-phased product structure is:

Frame

SupportHousing

Handle

GrillsFan

Hub

Fan Assembly

Blades

Motor

SwitchElec

Knobs

1234567

c) The net material requirements plan is:

Lot SizeLead TimeOn HandItem ID1234567

110020 FanGross Requirements1000

Projected On Hand100

Net Requirements900

Planned Order Receipts900

Planned Order Releases900

1100HousingGross Requirements900

Projected On Hand100

Net Requirements800

Planned Order Receipts800

Planned Order Releases800

2200GrillsGross Requirements1800

Projected On Hand200

Net Requirements1600

Planned Order Receipts1600

Planned Order Releases1600

3150Fan

AssemblyGross Requirements900

Projected On Hand150

Net Requirements750

Planned Order Receipts750

Planned Order Releases750

1Electrical

UnitGross Requirements900

Projected On Hand

Net Requirements900

Planned Order Receipts900

Planned Order Releases900

2FrameGross Requirements800

Projected On Hand

Net Requirements800

Planned Order Receipts800

Planned Order Releases800

Lot SizeLead TimeOn HandItem ID1234567

150SupportsGross Requirements1600

Projected On Hand50

Net Requirements1550

Planned Order Receipts1550

Planned Order Releases1550

1400HandleGross Requirements800

Projected On Hand400

Net Requirements400

Planned Order Receipts400

Planned Order Releases400

1HubGross Requirements750

Projected On Hand

Net Requirements750

Planned Order Receipts750

Planned Order Releases750

1002BladesGross Requirements3750

Projected On Hand50505050

Net Requirements3750

Planned Order Receipts3800

Planned Order Releases3800

1MotorGross Requirements900

Projected On Hand

Net Requirements900

Planned Order Receipts900

Planned Order Releases900

12120SwitchGross Requirements900

Projected On Hand208

Net Requirements880

Planned Order Receipts888

Planned Order Releases888

Lot SizeLead TimeOn HandItem ID1234567

251KnobGross Requirements900

Scheduled Receipt200

Projected On Hand200200200

Net Requirements700

Planned Order Receipts700

Planned Order Releases700

15.13The following jobs are waiting to be processed at a small machine center:

JobDue DateDuration (days)

01026030

02025816

0302608

04027020

05027510

In what sequence would the jobs be ranked according to the following decision rules: (1) FCFS, (2) EDD, (3) SPT, (4) LPT? All dates are specified as manufacturing planning calendar days. Assume that all jobs arrive on day 210. Which is the best decision rule?

a)FCFS because all jobs arrived on day 210, and presumably in the order given, the FCFS sequence is:

010, 020, 030, 040, 050

b)EDD

Job SequenceDue Date

020258

010260

030260

040270

050275

Note that longest processing time was used to choose between jobs 010 and 030.

c)SPT

Job SequenceProc Time

0308

05010

02016

04020

01030

d)LPT

Job SequenceProc Time

01030

04020

02016

05010

0308

Scheduling RuleAverage TardinessAverage Flow TimeAverage # Jobs in System

FCFS7.457.63.4

EDD7.454.83.3

SPT6.639.62.4

LPT12.061.23.6

20 Fan

Switch

Motor

Blades (5)

Hub

Handle

Knob

Supports (2)

Frame

Electrical

Housing

Grills (2)

Fan Assembly