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It is normal for spindle speeds to fluctuate occasionally during the course of a job due to variations in the cutting mechanics. However, excessive fluctuations may point to an issue with the spindle.
Note the change in pitch of the fluctuations:
“Peaking”: the spindle speed briefly INCREASES to a higher speed, before quickly returning back to nominal speed.
“Dipping”: the spindle speed briefly DECREASES to a lower speed, before quickly returning back to nominal speed.
Check the PCB in the spindle is correctly constrained (check this article)
Check spindle clamp has not been over-tightened
Check spindle data connection
Check the condition of the spindle brushes. Check that the brushes are still over 9.5 mm long (illustrated here).
Evaluate the job parameters (see “Evaluate the job parameters” in this article)
Elliot. is the author of this solution
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