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General Mach Discussion / y and z axis move opposite direction

« on: March 09, 2015, 05:07:06 PM »

Need help please. I have a KRMx02 router driven by Gekko G540 and Dell PC running Win XP sp 3, and Mach3. The machine has been running flawlessly for a long time. I have made no changes to Mack3 nor made any changes/updates to XP, and have not installed any new software. A few days ago I was running G code that has worked fine before, when on a new run the z axis began running down when it should move up. Later the same began happening with the y axis. The manual jog keys cause correct motion, but the DROs indicate motion in the opposite direction. I had this problem with the z axis over a year ago, but can't recall how I fixed it. Any help or suggestions will be greatly appreciated.

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General Mach Discussion / Mach3 goes crazy

« on: October 13, 2013, 08:55:54 PM »

I have a random problem with my CNC running Mach3 from g-code generated from Cut2D. I can't recall having this problem when running a single part, but when running for multiple identical pieces, the machine goes crazy from time to time. It might cut 3 of 10 pieces perfectly, but when moving to the next might not go to safe z and thus cut a path through a good piece toward the next piece starting point. Other times it may go to the next piece starting point and dive to the mechanical z limit (down). One other random action has been at the end of a run, and returning to zero it tries to go to a point outside of the machine. In this instance I noted that the x and y readouts were completely out of whack so that 0,0 was way outside of the machine boundaries. I can reload the same g-code and it will run past the point where it previously went crazy, so it does appear to be random, and not a problem in the g-code. The PC running Mach3 is dedicated - not connected to the internet, and not running any other programs other than Cut2D (just open - I don't design anything while Mach3 is running), and I don't use the mouse or touch the keyboard. I finally got ticked off today after ruining a couple hundred $ in parts and material, so I really need any help anyone here can offer. The one thing that dawned on me a while ago is that it might be a grounding problem. Without going back to my shop and checking, I'm pretty sure there is no common ground between the gecko controller, router power, controller power supply, and the computer. I'll check that in the morning, but if anyone has other suggestions I'll appreciate any help.
Warren

If I need to add a tag line here it's "When the winds of change blow build a windmill not a windbreak"