Dynamic tolerance analysis of multi operation manufacturing process

A component is typically produced through several machining processes in a manufacturing environment. Tolerance is assigned to each operation considering the inherent capabilities of the process and the blue print (B/P) requirements. The tolerance chart is a graphical representation of a process plan used to establish the link between interrelated machining operations, and defines a procedure to control the tolerance stack up. Existing tolerance charting procedures are essentially of static nature. They are used to validate the process plan and assign tolerances to cuts at the pre-production stage. Based on the original manual tolerance charting procedure, a dynamic tolerance charting system has been developed. This system assigns tolerances to cuts and validates the process plan based on actual process measurements. An overview of algorithms developed for dynamic tolerance charting is presented. The results show that dynamic tolerance charting may be used as an effective tool for process control