I'd like to add an encoder (e.g. a basic single-pulse type) to my spindle for realtime RPM and maybe rigid tapping. Wondering if anyone has done one of these and if so how they went about it--phototransistor type, Hall-effect sensor, etc.? I've done a simple one to enable RPM monitoring and threading on a lathe with LinuxCNC, but not sure about best approach for this, particularly something that won't affect spindle balance.
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