Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: Mel Stanley on January 17, 2018, 02:16:12 PM
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I recently added CNC to my RF31 Mill. While testing its ability to precisely repeat cutting a 2 inch square, I noticed that on the second pass (and on) it cuts an additional .010 on the bottom of the square along the X axis, each which is then reflected on the X axis cut along the top of the square. For each time I repeat this the path along the Bottom and top of the square becomes wider. Cuts along Y axis sides of the square stay in their original width. I have checked everything as far as offsets, wrongly tuned motors, etc, and I am stumped.
Has anybody experienced this problem and how was it resolved?
Thanks
Mel Stanley, Utah
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Hi Mel,
your machine is gaining/losing steps in the Y axis.
May I suggest as an experiment swap the drive signals to the X and Y axes stepper drivers and run the same program.
If the drivers and steppers are good the fault will stay on the Y axis and you can look closer at your Mach installation
or BoB. If the driver and/or stepper are faulty the fault will now be on the X axis.
Gives you a means to focus on the right area.
Craig
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And to add to what Craig said, this is a new install correct? If that axis is binding in some way or the steppers are not geared right it will miss steps. I added CNC to my RF31 mill - drill years ago and it was very disappointing, so slow.
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Yes it is a new install with a "newbie" steering it and i might as well be blindfolded.
I thank you for your advice and thank you for posting it. At least now i have a way to isolate the problem.