Mark Wendt (Contractor) pravi: > At 08:43 AM 3/25/2010, you wrote: > >> Mark Wendt (Contractor) pravi: >> >>> At >>> .001, sometimes I'd get no movement (I'd here stepper motor noise but >>> no movement on the dial indicator), other times I'd get a half-thou, >>> >>> >> This can be only mechanical then... Check backlash and endplay of nut... >> check coupler too.. If motor make step and gantry not then don't blew >> software :D >> >> Slavko. >> > > > This is on a rack and pinion system, pulley mounted directly on > stepper, pinion has pulley mounted directly to it, with cogged timing > belt driving the pinion. All these numbers were with the gantry > moving in one direction, jog and hold, jog and hold, while watching > the dial indicator for movement between jogs, which there was > none. Does backlash come into play when all moves are in the same direction? > > Mark > > > If you use microstepping then you can just need to much.. Anything above 8th is wasted. Regular steppers doesn't make same steps with microstepping. Backlash can deflect measurment even if you move in same direction. Seems silly but it's true. If you tend to stop gantry to fast then stored kinetic energy in gantry move "slash" and voila.
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