How to judge abnormal noise of CNC Router

How to judge abnormal noise of CNC Router

There is noise for Woodworking CNC Router with stepper motors when it is processing
materials by every step,it is normal.
Under some frequency,there is resonance for woodworking cnc router,and then there is noise,
this kind noise can not influence the performance of the cnc router.

The following noises will be harm for woodworking cnc router.
1. There is abnormal noise when the spindle motor is moving.
   This kind noise indicates the quality of the spindle motor is not good or the spindle
   bearing is broken.
2. There is noise when the spindle is working along three axes,the problem offen happen in
   X axis.
   It is probably that the motors bearing is broken or there is no lubrication oil for X axis. If there is dirty,too tight,and the ball is worn out,you must deal with it timely.