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General Mach Discussion / Re: I can't seem to get Backlash Compensation to work...
« on: October 02, 2009, 09:59:28 AM »
I'll test cutting a square tonight and measure it just to make sure my issue are 100% with backlash and not the motor settings, altought from what I have cut so far, everthing turns out the size and position it should. I originally drilled my table using the router with 128 evenly spaced holes on the 4X8 table. It worked perfect but I could tell I had small backlash issues when changing directions.
The circle issue appears to be mostly backlash in the X axis and I will see if I can reduce it further with Machine adjustment. I tested cutting a 2" circle positioned at +1",+1", clockwise and with the machine starting at 0,0 and starting cutting at X2",Y1". As it rotates around the circle clockwise starting at the right side of the circle it cuts straight down for a small distance as the X axis changes direction from where it started, then starts the turn (creating an egg shape at the lower right side of the circle, does the circle well from their until it gets to the upper left side of the circle where it does the same as the lower right when the x axis changes direction, again, egg shaped upper left of circle. What supprized me is that the backlash settings in Mach didn't affect the shape of the circle at all, leading me to believe it isn't working. Even putting in .07 as the X and Y backlash, no change at all. It should have changed the shape of the circle a little. I'll keep testing. It has backlash settings for XYZ and ABC.... what are the ABC settings for? Is that for machines with more than 3 Axis?
The circle issue appears to be mostly backlash in the X axis and I will see if I can reduce it further with Machine adjustment. I tested cutting a 2" circle positioned at +1",+1", clockwise and with the machine starting at 0,0 and starting cutting at X2",Y1". As it rotates around the circle clockwise starting at the right side of the circle it cuts straight down for a small distance as the X axis changes direction from where it started, then starts the turn (creating an egg shape at the lower right side of the circle, does the circle well from their until it gets to the upper left side of the circle where it does the same as the lower right when the x axis changes direction, again, egg shaped upper left of circle. What supprized me is that the backlash settings in Mach didn't affect the shape of the circle at all, leading me to believe it isn't working. Even putting in .07 as the X and Y backlash, no change at all. It should have changed the shape of the circle a little. I'll keep testing. It has backlash settings for XYZ and ABC.... what are the ABC settings for? Is that for machines with more than 3 Axis?