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General Mach Discussion / Re: sizes aren't correct anymore please help !
« on: December 20, 2014, 07:12:28 PM »
If the error is repeatable it sounds allot like the "steps per unit" is not correct and its a compound error problem. Meaning the farther the axis moves away from home or zero the more error is developed. The other key piece of info you posted, is you made allot of changes to your driver board settings and Mach 3 kernel speed and who knows what else.
I would do the stepper per unit math and get a baseline number to use in motor tuning window and start from there. Then using the Mach 3 step axis calibration function and move 6 or 10 inches and see what the error is. I have a 12" digital caliper I use to calibrate my steppers.
Moving the axis 0.100 or 0.900 is not really far enough to get a accurate error measurement because the accumulated error is very small at that point. Being off 0.04 @0.900" and 0.02 @ 2" I'm willing to bet its way off at 6".
I would do the stepper per unit math and get a baseline number to use in motor tuning window and start from there. Then using the Mach 3 step axis calibration function and move 6 or 10 inches and see what the error is. I have a 12" digital caliper I use to calibrate my steppers.
Moving the axis 0.100 or 0.900 is not really far enough to get a accurate error measurement because the accumulated error is very small at that point. Being off 0.04 @0.900" and 0.02 @ 2" I'm willing to bet its way off at 6".