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« on: February 10, 2009, 10:39:41 AM »
Hi Hood, yep, that's checked and working - doesn't work without that - its all over the place without that checked. Z axis is near perfect no matter what happens with the spindle speed when checked, so I know that is working well.
Keith, I can't add that delay specifically as I'm using G76 (unless I change the macro??), however, this already has about 1 or 2 secs delay before each cut. Also, I feel the problem starts at the point the spindle slows, not before the start of the next thread cut. Its really counter-intuitive!
I'm starting to think it may be a bug in this version, either of the macro or Mach3...
As I said, everything is fine until the spindle slows more than about 5%. 3% or 4%, no issues but when the cut is sufficiently deep to slow it 5% then the very next cut exhibits this change in X axis, totally repeatably, in the next cut, and the next and the next but with no loss in actual position and no loss in steps. So it must be being commanded under Mach3 control otherwise the X DRO would be wrong, but it is absolutely accurate.
This is with and ORAC lathe and a 1/3hp motor (2000rpm) with VFD down to about 400rpm, so there is not much torque and no closed loop control of spindle speed - that is a future project...! With that in place I think this problem would not show up. But, it should not be moving the X axis during a cut.
Thanks for your input!
Woody.