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  • Why not filter for 500 Hz or a harmonic, to eliminate noise? For that matter, would direct pickup from coils placed near the shaft or other vibrating part work better than an accelerometer? Commented Aug 20, 2021 at 2:31
  • Please can you elaborate a little more. My hardware knowledge is close to nothing. Commented Aug 20, 2021 at 4:10
  • If the spindle rotates at 30,000 RPM, that's 500 revolutions per second, so likely the vibration is at that frequency, in which case an LC pass filter would emphasize that frequency, reducing signal outside it pass-band. On the other hand, if you're trying to pick up vibrations such as the bit chattering against work, you might want to block noise from the spindle rotation with a blocking filter. This is a bit too complex to explain from scratch, research L-C band pass filter. Commented Aug 20, 2021 at 16:58