Overlapping OverlappingBasically, overlapping is a scheduling approach where the next operation is started on the first part of a batch without waiting for the preceding operation to be finished for the other parts of the batch.
The implementation of overlapping requires the following information:
•A transfer lot has to be entered into the routings, or on the WO. If the transfer lot field is left empty, no overlapping is implemented. When a transfer lot is entered in the field, the size of the transfer lot must be at least a hundredth of the size of the production lot, in such a way that there will be at a maximum 100 transfer lots.
•The type of overlapping has been specified on successive operations. For a particular operation, the overlapping is specified relative to the previous operation, which means that overlapping for the first operation of the WO is impossible.
•In order to use overlapping, it is necessary to click in the Overlapping box in the Preference window, Planning tab.
There are three possible types of overlapping:
•'01' Early Setup: The set-up is started before the first part of the first transfer lot arrives at the machine.
•'10' Simple overlap: The set-up is started when the first lot arrives at the machine.
•'11' Early Setup and overlap: The set-up is started in such a way that production can start when the first lot arrives at the machine.
