Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: johnwlindsay on November 29, 2014, 07:57:41 AM
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While following tool path, periodically, the z axis just bores into the project, through the 3/4" material and into the sacrificial surface. Yesterday, it was on a toolpath where the depth was set at 1/4" and it goes as much as 1" deeper. I can run the same toolpath later and nothing happens. I can't figure it out, and it has ruined several projects doing this. John Lindsay
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Certainly having more than your fair share of problems John.
Could be that your Z axis is losing steps on the way up and thus goes deeper into the work on the way down.
Try halving the velocity and acceleration settings for the Z axis in motor tuning (save the changes) - see if this resolves the issue.
Tweakie.
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I tried reducing the feed rate by half before I saw your reply. Doing that, I didn't have any problem with it and got through the project ok. I am using an old XP machine, wondering if there are memory issues or something that causes the problem. Thanks for your reply.
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You say you reduced the feedrate, were you meaning the Velocity in motor tuning? That was what Tweakie was telling you to try.
Hood
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I think we figured this out. I was running the gcode off of the flash drive. Soooo...the machine wants to go to sleep - transferred all to the hard drive and it seems to be working fine. I think it was skipping steps and then taking up after a gap, I think we're ok now, but I have purchased a refurbished XP machine with a clean hard drive and more system memory to run the CNC with. I think that's a good precaution. I retired the xp machine a few years ago because it was having memory issues, and other instability issues. Sometimes we forget why we retire these machines. We'll see. Thanks for your help. I may be back.
john