How Do You Isolate The Cause Of A CNC Machine Tool Spindle Noise To A Mechanical Or Electrical Problem?
You notice an unususal noise when the spindle is rotating. Is it mechanical or electrical in nature? How can you tell? Most people seem to always gravitate toward the possibility that the spindle bearings are defective. Often it is the bearings that are causing the noise. However, a problem with a spindle sensor or spindle amplifier can create oscillation or rattling noises. This should be the FIRST THING YOU DO when troubleshooting. Run the spindle at a safe speed for any tool that might be in the spindle at the time (or chuck if you are dealing with a lathe). Find a speed where the unusual noise is as clear and pronounced as possible. Turn of the MAIN BREAKER of the machine. Listen for the unusual noise as the spindle coasts to a stop. Make your determination: If the noise is still present and becomes less pronounced as the spindle slows down, you have yourself a mechanical problem, whether it be bad bearings or some other cause. However, if the noise is being generated electrically,
