In case anyone is interested: % G0 X0.000 G0 X0.001 %
Starting from position X=0.001" my Tek MSO3034 scope shows the move back to zero and then to 0.001. The direction line set in the + direction rises to the - direction and moves to 0.000. Then immediately changes to the + direction and another 15 step pulses to move back to 0.001. And then the direction line toggles 3 times. And although DIRSETUP in the ini file is set to 1000 nS the actual time from rising dir pin to first step pulse in this example was 2.89mS. The change in direction to first step to go back to 0.001" was 3.23mS. John > It doesn't appear to do any harm since the step lines are stable. But it's > odd > and very repeatable in either direction. The direction signal always returns > to + direction regardless of the jog direction. The attached screen shot > show > a 0.001" move in the negative direction with exactly 15 steps which matches > motor encoder and 3:1 pulley and 5 TPI lead screw. > > I'll temporarily remove the limit switches, backlash and run a short G-Code > program that moves 0.001 and then -0.001" and capture the direction signal. > Very curious. >
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