3 Axis CNC router

**JoeHarris** · 28-01-2018

So I tried the calibration tool in MACH3 this evening. Moved a centre finder 600mm up the x axis against a steel rule. To the eye it was bang on. Moved it 500mm on y axis and it was maybe out by 0.5mm over that distance. So why was it out over 50mm when cutting??

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**Clive S** · 29-01-2018

Originally Posted by JoeHarris

So I tried the calibration tool in MACH3 this evening. Moved a centre finder 600mm up the x axis against a steel rule. To the eye it was bang on. Moved it 500mm on y axis and it was maybe out by 0.5mm over that distance. So why was it out over 50mm when cutting??

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Is it missing steps? What are you setting for that axis?

**JAZZCNC** · 29-01-2018

Originally Posted by Clive S

Is it missing steps? What are you setting for that axis?

Clives right it's missing steps but not because of anything you have done or the machine.!!

It's most likely the Step pulse is on then wrong side of the slope. It happens often with IP-M and Leadshine drives or any drive that can select the leading edge.

Easy to see and easy to fix. The test is to knock up some G-code which moves say 500 times from point A to B doesn't matter how far.
So G0 x10 then back to X3 repeated 500 times will be plenty. Then last move back to X0.
What I do is setup dial gauge and zero out against the axis. Then run code, this why only move to X3 so not smacking gauge each move then last move back to it with X0.

If out it will soon become clear.

If doing this the fix is to go into MOTOR OUTPUTS and toggle the Step Lo box. This is the only box other than Enable that IP-M uses on that screen.

Hope this fixes you.