First, let's look at the cause of the backreference point failure. This failure may be caused by:

• Photoelectric switch damage: CNC machine in the implementation of the movement, need to detect the position of the workpiece through the photoelectric switch, if the photoelectric switch is damaged, it will lead to the machine can not determine the position, and then back to the reference point fault.

• Control System Failure: CNC machine tool control system is the core of the whole machine tool, if the control system failure, it will lead to the machine tool can not back to the reference point.

• Mechanical failure: CNC machine tool is a complex mechanical system, if the mechanical parts of the failure, such as loose lead screw or bearing wear, can also lead to machine tool back to the reference point.

Next, we will introduce how to solve the numerical control machine tool back to the reference point fault.

• Check the photoelectric switch: if the photoelectric switch is damaged, the photoelectric switch needs to be replaced. Before replacing, the photoelectric switch should check the circuit and wiring is normal, to ensure that the fault is not due to circuit or wiring problems caused by.

• Check the control system: if the control system failure, need to check the control system, find out the cause of failure and repair. You can locate the cause of the fault by checking the alarm information and reading the system status.

• Check mechanical parts: if mechanical parts are out of order, repair or replacement is required. Before checking the mechanical parts, should check the machine tool lubrication system is normal operation, because the lubrication system failure will lead to mechanical parts failure.

In general, CNC machine tool back to the reference point fault may be caused by a variety of reasons, so it needs to be carefully investigated and analyzed. If you can not solve the problem, you should seek professional help to ensure that the machine can resume normal work as soon as possible.