Positioning error: The positioning error mainly includes the reference misalignment error and the inaccurate manufacturing error of the positioning pair.
Measurement error: When the part is measured during or after processing, the measurement accuracy is directly affected by the measurement method, the accuracy of the measuring tool, and the workpiece and subjective and objective factors.
Tool error: Any tool will inevitably wear during the cutting process, which will cause changes in the size and shape of the workpiece.
Fixture error: The function of the fixture is to make the workpiece equivalent to the tool and the machine tool to have the correct position, so the geometric error of the fixture has a great influence on the machining error (especially the position error)
Machine tool error: including spindle rotation error, guide rail error and transmission chain error. Spindle rotation error refers to the variation of the actual rotation axis of the spindle relative to its average rotation axis at each instant, which will directly affect the accuracy of the workpiece to be processed.