On 03/02/2015 02:00 AM, Gregg Eshelman wrote: > You could use a timing belt from the motor to the spindle > then put the encoder on the motor. Do the math thing with > the pulley ratio and you can get the spindle RPM. The problem is that for multi-pass threading, you need one index pulse per rev. If all the belts were set up for integral ratios, that would still work, it just might take several turns to find the index. But, you'd need to code the spindle count to compensate for this, or your threads would come out off by that belt ratio.
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