Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: lxapilot on June 02, 2012, 05:15:56 PM
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Occasionally my Mach-3 will randomly reset the zero height of my z-axis in the middle of running a G-code--causing the bit to ruin my piece on the way to its next location. This appears to happen when running a g-code longer than about 15,000 lines or so. If I run the same code over again, the same thing happens, but in a different place...I don't see anything wrong in the code. Has anyone else had this issue? Thanks in advance.
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Hi lxapilot,
No offence intended but are you certain that you are using a 'genuine' licensed version of Mach3 ??
Tweakie.
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Yes, it's a genuine, licensed copy. As it turns out, it's not the z-offset that's changing, it's the machine coordinates. As an example, the top of the piece in one of my projects is -2.3. All of the suddent, the machine coordinate changes to +1.5, which moves the perceived zero and ruins the wood. I would think this has to be a mechanical error, such as a motor binding, but I'm not sure. I've changed the z-axis acceleration from 4.0 all the way down to 0.8, with the same problem. I've also had this happen while in the middle of a long, straight cut with no programmed z-axis movement at all--all of the sudden my bit drops about a quarter inch further into the wood. Any ideas?
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Hi lxapilot,
If you zip and post (as attachment) a copy of the code you are having troubles with I can run it here. This should prove that it either is or is not a GCode / Mach3 issue.
(I never actually use offsets / machine co-ordinates as each job or fixture is generally always positioned in a slightly different place on the work table but there have been reported cases in the past where certain subroutines and offsets can cause conflicts).
Tweakie.