Meaning
Recursive path in a production process where defective units are sent back to an earlier stage for correction. A rework loop bypasses the normal flow of the assembly line to fix errors identified during quality inspections. It adds significant cost to the final product because the unit consumes labor and materials twice for the same step.
Resource Drain
Personnel assigned to the rework loop are not contributing to the primary production yield, which lowers the overall efficiency of the factory. Materials may also be damaged further during the repair process, leading to a higher scrap rate than if the part had been made correctly the first time.
Process Masking
High volumes of repair work can hide the true capability of the main line by making it appear that production is steady even when quality is poor. If the rework loop becomes a permanent part of the workflow, the root cause of the defects is rarely addressed because the system has adapted to tolerate failure.
Capacity Loss
Every hour spent fixing a mistake is an hour that could have been used to create a new, saleable unit. Management tracks the frequency of these cycles to identify which machines or operators require additional training or maintenance.