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« on: June 01, 2012, 04:50:49 PM »
After cutting 100 of the same piece without trouble, or change to any setting, the Z started plunging deeper on the piece. It would plunge to drill a hole and not lift up the specified amount. As it continued to drill the next couple of holes it wouldn’t pull up enough to clear the surface and would route a line leading to the next hole. I’ve tried turning everything off and restarting everything and I get the same issue. I noticed when I was cutting the previous pieces that when the machine returned to the start position after completing the job the DROs for X & Y were not zeros so I would just hit “Go to Zero” and then start the next job.
When it started ruining material I decided to check the steps on the Z axis and when I did, I found that the positive direction was fine but when I went in the negative direction it was off a bit. I tried going back and forth with calibrating the steps and could get close but not as close as I would like so I went in to motor tuning and stepped up the acceleration and velocity wondering if that might have some effect on the stepping. Much to my dismay the motor for the Z started to vibrate badly so I ran it to the limit switch and it stopped. After resetting the acceleration and velocity back where I had it (60 and 10 respectively) I got the jogging to slow down but it still vibrates badly even when no jogging is taking place. When you look at the motor it is just going back and forth rapidly causing the spindle to shake up and down until I either close the program or run it up to its limit switch.
Is there anything you can tell me that might help?
Thanks a bunch - bingart