Accuracy improvement for three axis CNC machining centres by geometric, load and thermal error compensation

Based on an indirect identification pre-calibrated technique it utilises a unique algorithm, which allows the system to compensate for the geometric error components of any normal orthogonal machine tool configuration. The rigid body model is modified to include for the non-rigid effects and a novel technique for reducing workpiece errors caused by the thermal distortion of a Computer Numerical Control (CNC) machine tool is introduced. The methodology and validation of the universal rigid body compensation model with its machine specific non-rigid body and thermal effects suitably integrated are demonstrated. Other elements such as: calibration methodology, dynamic measurement, non-rigid effects/compensation, and thermal distortion models are the subject of further papers leading to the overall objective(1,3,5,6,7,8).