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Topics - swarfmeister

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General Mach Discussion / Backlash Problems
« on: December 24, 2013, 06:08:03 AM »
I am having a strange issue with Mach3 backlash compensation.  I am using a 4' X 6' router.  I am using steppers and Lead shine servos with 90V AC power supply (2 X 240V AC transformers).  Max speed of the machine is 10,000mm/min.  It works fine at that speed.  Manufacturer rates it a twice this.  The machine works absolutely fine with backlash compensation turned off.  I have no problems with correct travel or simultaneous moves of the axis.

If I move one axis at a time (X, Y or Z) everything works as expected with the backlash compensation enabled.  If I try to move any two axis concurrently there is no problem as long as I move in such a way that backlash compensation is not activated.  If I move in a manner that enable backlash compensation the machine clunks, drops steps and (occasionally) squeals.    

I am trying to surface my spoil board and, by the end of the surfacing operation I have lost ~3 inches in X.  Repeat with backlash compensation of and there is no clunking and the machine works as expected.

e.g. I can replicate is I start the y axis moving in one direction continuously and whilst it is moving, I move the x axis or z axis one way, then the other (say 2 seconds in either direction).  Even if the x/z axis is stationary but Mach3 determines that it is a change in direction from the last move, the axis will lock up.

Changing motor speeds and acceleration makes no difference.    I have tried backlash settings of 50% of max, as well as 20, 10, 5, 1.  All has no effect.

My backlash settings are very small for each axis:
X  0.030mm
Y  0.055mm
Z 0.035mm

I confirmed Constant Velocity mode is turned on.

I am using Mach3 R3.043.066 (Latest) on Windows XP and the software is registered.

Can anyone help?

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