What are the ten common faults and solutions for CNC woodworking lathes?

Many owners and friends of CNC woodworking lathes say that in the process of using CNC woodworking lathes, sometimes there will be failures such as machine stalls, large machining errors, and loss of machining programs. They want to know how to solve these common faults. Are you also troubled by all kinds of problems in the process of using CNC woodworking lathes? Today Leapion Laser summarized ten common faults and solutions, and shared them with you.

Phenomenon 1: There is no indication on the power supply and no information on the display screen after turning on

Reason: A. The power supply is not connected well or the fuse is burned out;

B. The signal cable is loose or disconnected.

Solution: Check the power cord wiring, disassemble the electric box to replace the fuse, and check whether the power cord is in good contact with the signal line.

Question 2: The CNC woodworking lathe can be turned on normally, but the power motor cannot run

Reason: power supply lack of phase, fuse blown or thermal relay tripped.

Solution: Check the power wiring, replace the fuse, and reset the thermal relay.

Question 3: The workbench stops suddenly while the CNC program is running

Reason: This phenomenon is generally caused by a mechanical failure, but it may also be caused by a failure of the control system.

Solution: At this time, you can first return the workbench to the origin and restart the processing program. If the workbench always stops when it runs to a certain position, it should be that a certain part of the transmission system is damaged, deformed or blocked by foreign objects.

A. First cut off the power, and then check whether the gap between the nut and the screw or the slide plate is too tight, whether there are foreign objects in the ball guide groove of the ball screw, whether the screw is bent or deformed, and the flexible gear in the stepper motor reducer Whether it is loose or stuck with foreign objects, etc.;

B. If there is no abnormality in the manual cranking, the control system is faulty. First, check whether the connecting plug of the stepper motor is in good contact. If the contact is good, the motor that has no fault can be replaced to verify whether the motor is good. If the motor still cannot work normally after changing the motor, it means that the control part is abnormal, and you can focus on checking the high-power transistor on the drive board and its protective component release diode.

Fault 4: During the execution of the CNC program, the monitoring state is returned and the work stops

Reason: Generally, it is caused by a failure of the monitoring program or strong magnetic interference.

Solution: Grounding or shielding can be used to solve the strong magnetic interference. If you do not execute the program or execute the instruction when you start the program, it will immediately return to the monitoring state. Generally, the monitoring program or computer hardware is faulty, and the suspicious chip can be replaced, such as the off-chip program memory chip, the programmable interface chip or the single-chip microcomputer itself. Sometimes an off-chip data memory failure can also cause this phenomenon. Otherwise, we have to find the manufacturer to re-debug.

Fault 5: When the CNC woodworking lathe is working, the tool stops at one place, and the stepper motor does not vibrate

Reason: the stepper motor control line is open

Solution: Reconnect the control line.

Special attention: Check that the wiring board plug of the control system under the button control board has been loosened or fallen off by mistake, and the wiring and plug on the stepper motor have been loosened or fallen off by mistake.

Phenomenon 6: The surface of the processed finished product shows regular screw patterns

Reason: The center sleeve is not processed as required. The concentricity is not high. The standard processing method is to combine the bearing block and the inner circle into one. The workpiece must not move in the middle, otherwise the inner and outer circles will not be concentric.

Solution: Click to re-customize the center cover.

Fault 7: Some stepper motors only rotate in one direction (tools only move in one direction)

Question 1: When measuring the DIR of the 5V interface and the wiring board, is there a voltage change when clicking 5V and 0V before and after? If it is not, it is a fault in the data line or the control system.

Solution: Replace the data cable or repair the CNC system.

Problem 2: There is a problem with the wiring board of the motion CNC control system. To determine this problem, you can replace the plug of the drive to the wiring board. If it is normal, it is a circuit board problem.

Solution: Replace the wiring board.

Question 3: The drive is faulty. You can replace the motor plug on the same drive. If the fault is transferred to another axis, it can be determined that the drive is faulty.

Solution: Replace the drive.

Fault 8: The stepper motor loses steps when the CNC woodworking lathe is running at high speed

Reason: It may be that the voltage of the drive power is reduced, which reduces the output torque of the stepper motor.

Solution: Check the driving power supply part. When the high-voltage switch transistor is damaged, the high-voltage power supply cannot be turned on. At high speed, the output torque of the stepping motor decreases and steps are lost.

There may also be a mechanical failure, so you should also check the lead screw, screw nut, slide, stepper motor reducer, etc. When there are parts that are bent, deformed or foreign objects, the running resistance will increase, and the phenomenon will not occur at low speeds. Obviously, but the running resistance cannot be completely overcome at high speed.

Fault 9: The tool does not return to the zero point at the end of the program operation

Reason: In this case, it is usually a failure of the control system. When the tool is in feed or in processing, the stepper motor runs at a low speed, and when the program returns to the zero point, it is required to return quickly.

Solution: The stepping motor runs at high speed and uses high-voltage drive power to increase the output torque. There is a switching transistor that controls the output of the high-voltage driving power supply. When the switching transistor is damaged, the high-voltage power supply cannot be turned on when the high-speed zero point is returned. The output torque of the stepping motor is not enough, causing the tool not to return to the zero point. It can be eliminated by replacing the switching transistor.

Fault 10: The size error of the workpiece after processing is very large

Reasons and solutions:

A. One possibility is that the screw or nut is loosely connected to the lathe. There is no tool resistance during idling, and the slide plate operates normally. Due to the increase in cutting resistance during processing, the connection between the lead screw or nut and the lathe becomes loose, causing the size of the processed workpiece to drift. The fault can be eliminated by tightening the connection part.

B. Another possibility is caused by the electric tool post. If the tool post cannot be automatically locked after changing the tool. When cutting, the tool deviates from the machining point, which can also cause the above phenomenon. At this time, check the knife holder locking device and the knife holder control box.

Fault 11: The machining program of CNC woodworking lathe is often lost

Solution to the cause: If the machining program is lost after the control system is powered off, and the machining program is re-entered after the machine is powered on, the machine can process normally, it may be that the backup battery voltage is reduced or disconnected, causing the machining program in the data memory to be in the machine tool. It cannot be maintained after power failure and is lost. Just replace the backup battery.

If the processing program is often partly or completely lost during processing, it is most likely that the data memory is faulty. At this time, the off-chip data memory or the single-chip microcomputer itself can be replaced.

Let me share so much today. For more questions about CNC machine tools, please contact Leapion Laser directly. Welcome to consult.