More fiddling and it appears the encoder is 2000 CPR. At any given speed selection the spindle is turning a bit faster than specified, with the difference becoming greater the higher the speed. I believe this is due to it being a UK lathe and running at 60Hz instead of 50Hz, at least the difference seems to match that ratio. As a result the spindle-at-speed is staying false at all but the lowest speeds. I'm not sure of the best way to deal with this, not using spindle at speed, setting the tolerance rather high, something else? I seem to recall there was a parameter somewhere for an analog output offset that I could perhaps use, or how can I run the spindle closed loop and let linuxCNC hold the exact spindle speed?
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