The reasons for abnormal machining accuracy of lathe machine can be follows:
1 Lathe machine feed unit is changed or changes.
2 Zero offset of each axis is abnormal.
3 Axial backlash is abnormal.
4 Motor abnormal operating conditions:such as electrical and control part, mechanical failure, such as screw, bearings, shaft coupling and other components.
5 In addition, processing program,tool selection and human factors, may also lead to abnormal machining accuracy of lathe machine.