Frank Tkalcevic wrote: > My lathe CNC conversion uses a servo motor to drive the spindle. It is > 4000ppr, with an index pulse, controlled by a 5i20 and 7i33. It uses a 1:3 > pulley ratio. Can I set this up for threading? > > I had a quick try, machining a simple test thread, but as I expected, using > a standard setup, I got a 3 start thread because there are 3 index pulses > per spindle revolution. I suspect adding a simple pulse divider (divide the > index pulses by 3) wont work either, because there is the index-enable pin > which not only signals an index, but resets the encoder count to zero at the > 5i20 level. > > Or, you could gate the encoder's index with an additional optical sensor, so the index only gets through when the sensor is also blocked by a vane or tab on the spindle.
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