Lead Times
Lead times for operations and manufacturing are expressed in terms of several components.
Lead Time Components
• Queue. Amount of time a lot must wait at a work center before the operation is set up and production begins. Occurs when there is a backlog of jobs at a work center and is frequently the single longest component of manufacturing lead time.
• Setup. Time required to prepare a work center to process a lot or batch quantity for a specific operation.
• Run
• In Routing Maintenance (14.13.1), the average time required to manufacture a single unit.
• In Process Definition Maintenance (15.13), the average time to process an entire batch.
• In Routing Maintenance (Rate Based) (14.13.2), run time is expressed in terms of an hourly production rate.
In all cases, the system stores run time internally as the run time per unit.
• Wait. Amount of time a lot or batch must remain at a work center after production is completed before it can be moved to the next operation.
• Move. Time a lot or batch spends in transit from one operation to the next.
• Subcontract. Number of days required for an outside supplier to process the lot.
