When a routing for a work order is planned, it may often be possible to begin an operation before the previous operation has been completed. The degree to which an operation may begin before the previous operation has been completed is referred to as the overlap percentage. A 100 percent overlap means that an operation is scheduled to start simultaneously with the previous operation. A 25 percent overlap indicates that an operation is scheduled to start when the previous operation is 75 percent complete.
You can control the overlap percentage allowed for an operation using the Overlap % field for a work order step on the Work Order Entry Operations tab. You can also maintain the overlap percentage for a standard routing step using Routing Maintenance.
Note An overlap percentage entry for the first step in a routing has no effect because there is no preceding step. Overlap percentages are also ignored when multiple operations are performed at the same center.
Example
The first step of a work order requires 40 hours of run time with a start date of 5/11/03, and the work center for the step is available for 8 hours a day. The second step requires 16 hours of operation at a different work center that also operates for 8 hours a day. If the overlap percentage on the second step is 25 percent, the start date for the second step is calculated by backing out 10 hours (for example, 40 x 25%) from the completion of the first step. The following table compares the scheduling for the two steps first with 25 percent overlap and then without any overlap.
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5/11/03
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8 hours
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|
|
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5/12/03
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8 hours
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|
|
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5/13/03
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8 hours
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|
|
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5/14/03
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8 hours
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2 hours
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|
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5/15/03
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8 hours
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8 hours
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|
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5/16/03
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6 hours
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8 hours
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5/17/03
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|
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8 hours
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Although the start date for the second step is 5/14/03, only 2 hours were scheduled for that day. With 0 percent overlap, the second step cannot start until the first step is completed.
For more information, see:
Scheduling
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