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Messages - scudzuki

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11
General Mach Discussion / Re: Backlash Compensation question...
« on: November 01, 2008, 08:49:28 AM »
A less elegant solution would be to turn off b/l comp and compensate in the code. Of course this is also a far more complicated solution.
Joe

12
The issue is introduced by microstepping the stepper motor. Microsteps are not necessarily even divisions of full steps, as you've experienced. The rack and pinion drive likely intoduces some translation error as well.
Joe

13
General Mach Discussion / Re: Synchronising Motors
« on: October 23, 2008, 11:30:21 PM »
You would slave the a, b, or c axis to the x axis. The slave axis motor would need its own driver. And yes, provided you have the motor tuning correct (most likely you would have identical motors, drivers, and tuning on the x and slave axis).
Joe

14
General Mach Discussion / Re: changing feed rate during direction changes
« on: October 23, 2008, 06:30:12 AM »
Thanks for the primer on the obvious features of cutter comp. When cutter comp is enabled, the controller calculates the feedrate on the contour, not the toolpath, so in the above scenario, it would slow the feedrate at the ends of the slot.
Joe
1st class machinist
Moldmaker
CNC programmer

15
General Mach Discussion / Re: changing feed rate during direction changes
« on: October 22, 2008, 05:51:35 PM »
Doesnt' this happen automatically when using cutter comp?
Joe

16
General Mach Discussion / Re: still getting softlimits warning
« on: October 22, 2008, 05:48:18 PM »
So it's not just me...
Maybe if I include the G56 and the linear move in the same line...
Usually G54 is active (work offset 1). I used G56 because I had another offset saved in G54. I likely won't use offsets other than 1 often so I can try the routine using G54 and see if I get the same results.
Joe

17
General Mach Discussion / Re: still getting softlimits warning
« on: October 22, 2008, 06:41:02 AM »
I included fixtures.dat and a screenshot of the offsets table. Thanks in advance. How do you ever get any real work done when you spend so much time helping out here?
Joe

18
General Mach Discussion / Re: still getting softlimits warning
« on: October 21, 2008, 08:04:46 AM »
Yes the offsets are there. I did not enter them there directly of course, I zeroed the DROs while offset 3 was active.
Joe

19
General Mach Discussion / Re: still getting softlimits warning
« on: October 20, 2008, 08:06:05 PM »
I went in originally and selected work offset 3 by clicking in the box and typing 3, <enter>. I then zeroed x and y. When I run the program, while G56 is active, I change an axis dimension (lets say I re-zero x, which is off .001"). When I close Mach3, it prompts me to save the work offset (fixture save?) which I do. I boot up the PC the next day, fire up the mill, do a ref all, and run the program, which drops it in the center of my test fixture (occasionally off by .0005", but pretty good IMHO). If the work offsets are not in the xml file, I can tell you they are stored somewhere. Isn't entering work offset 3 the same as G56?
Joe

20
General Mach Discussion / Re: still getting softlimits warning
« on: October 20, 2008, 07:22:55 PM »
very simple program

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