It is generally regarded as a focus in the field of geometric metrology to evaluate cylindricity for inside diameter of huge cylindraceous workpiece.Error separation technique is developed by the application of photoelectric sensor with high precision

in which spindle straightness and motion errors can be directly measured.At the same time

the overall structure design and measurement process are given.The models of error compensation and cylindricity evaluation are obtained based on detailed error analysis.The models are proved to be correct by the simulation result.