A new error compensation model for machining process based on differential motion vectors

The product variation in a machining process is mainly affected by datum error, fixture error, and machine tool path error. In spite of the success of equivalent fixture error approach to compensating datum error and machine tool path error, the machining-induced errors have not been explicitly modeled and compensated by the current compensation model based on equivalent fixture error. This will limit its application in compensation accuracy. This paper formulates a new error compensation model for machining process using equivalent fixture error concept based on differential motion vectors. With this model, datum error and machining-induced errors can be transformed to equivalent fixture locator errors and then compensated. A real cutting experiment and an error compensation simulation for machining process will be conducted in the case study to demonstrate the model validity.