How to determine whether the sound of the woodworking engraving machine is abnormal?

Woodworking machine is generally used stepper motor, stepper motor has a pause for every step, noise is normal.
At a certain frequency, the engraving machine also produces a body resonance that emits noticeable noise. Such noise will not affect the normal use of the machine.
The noise affecting and detrimental to woodworking machines mainly includes the following two types:
1. The spindle motor emits abnormal noise during operation.

The generation of this kind of noise proves that the spindle bearing has quality problems or the spindle bearing has reached the end of its service life, or the quality of the spindle bearing has been reduced or damaged. At this time, replacement may be considered.

2. An abnormal noise is generated when walking in the axial direction. Many of these phenomena exist on the X-axis.

Mostly axial motor bearings are damaged or X-axis guides lack lubricating oil, dirty, over-tightened, ball wear, ball drop, etc., must be dealt with promptly.