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MFG/PRO 9.0 User Guide Volume 3: Manufacturing - QAD.com

MFG/PRO 9.0 User Guide Volume 3: Manufacturing - QAD.com

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104 <strong>MFG</strong>/<strong>PRO</strong> USER GUIDE — MANUFACTURING<br />

Table 6.6<br />

Sample Schedule<br />

Setup<br />

Fig. 6.5<br />

Operation Times<br />

Ï See “Lead<br />

Times” on<br />

page 37 for<br />

details.<br />

.<br />

Queue Setup Run Subcontract<br />

Operation 10 6 1 .05<br />

Operation 20 1 day<br />

Operation 30 5 .01<br />

Wed Thu Fri Sat Sun Mon Tue<br />

Queue 6.0 Setup 1.0<br />

Run 5.0<br />

Different release and due dates are possible using forward versus<br />

backward scheduling. This is because some lead time <strong>com</strong>ponents are<br />

scheduled in shop days and some in calendar days. A shop day lead time<br />

<strong>com</strong>ponent may be in effect over a weekend in one direction, whereas in<br />

the opposite direction, a calendar day <strong>com</strong>ponent may be in effect.<br />

Lead Time Calculations<br />

Subcontract<br />

1 day<br />

X X Queue 5.0<br />

Run 1.0<br />

Wed Thu Fri Sat Sun Mon Tue<br />

Queue 6.0 Setup 1.0<br />

Run 5.0<br />

Forward Scheduling<br />

Backward Scheduling<br />

X Subcontract<br />

1 day<br />

Queue 5.0<br />

Run 1.0<br />

The system uses an average manufacturing lead time calculated from<br />

averages of queue, setup, run, subcontract, wait, and move times for<br />

routings. The calculation assumes the average order quantity for the itemsite<br />

or item.<br />

The operation start and stop dates indicate when an order will occupy a<br />

work center. Queue time precedes the start date. Setup, run, and<br />

subcontract times fall between the start and stop dates. Wait and move<br />

times follow the stop date.<br />

When an order quantity differs significantly from the average order<br />

quantity, the system may allow too little or too much time to <strong>com</strong>plete the<br />

order. The greater the difference between the actual quantity ordered and

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