1. Positioning error: Positioning error mainly includes reference misalignment error and positioning pair manufacturing inaccuracy error.
2. Measurement error: When the part is measured during or after machining, the measurement accuracy, measurement tool accuracy, workpiece, and subjective and objective factors all directly affect the measurement accuracy.
3. Tool error: Any tool will inevitably wear out during the cutting process, and thus cause the workpiece size and shape to change.
4. Fixture error: The role of the fixture is to make the workpiece equivalent to the tool and the machine tool have the correct position, so the geometric error of the fixture has a great influence on the machining error (especially the position error).
5. 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 at each instant relative to its average rotation axis, which will directly affect the accuracy of the workpiece being processed.