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Old 03-06-2018, 04:25 PM
CAMhead Legend
Join Date: Jul 2017
Posts: 102
Default machine forgets to raise in z

I am doing 4500 of these plastic doors from 3/16" HDPE. simple program and I run (8) out of a 5x10. Every once in awhile the Z forgets to raise and scraps a part. I have done 2000 of them with the same program and it started to do it about 500 pcs ago and i have scrapped (4) of them. Not sure why its happening. I did all my programing in vectric and like i said I have done a bunch already....majority are good but the material is not cheap and trying not to scrap anymore. Seeing if there might be a setting I accidentally unchecked or something. Figure one of you guys might have stumbled across this. My machine is a PT-510 ATC
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Old 03-06-2018, 05:12 PM
Charlie_L Charlie_L is online now
Stinger II Owner
Join Date: Mar 2012
Location: Wisconsin
Posts: 1,397

When there are goblins causing trouble like this I sometimes consider grounding problems on the dust collection side. Just an idea to consider.
Charlie L
Stinger II, 48 by 48, 1.7 kW Spindle, FTC + Laser + Recoil + Vacuum, July 2012
WinCNC 2.5.03, Aspire 9, PhotoVCarve, Windows 7 Pro SP1
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Old 03-06-2018, 09:00 PM
Rlee1972 Rlee1972 is offline
CAMaster Owner
Join Date: Mar 2017
Posts: 461

I have experienced something similar to this as well. I found Charlie's comment to be the case for my "gremlins" both times. Hope this helps!
Ron Lee
Blackshear, Ga
2018 Cobra Elite 5 x 10
20 Tool Holder
25HP Regen Vac

2017 Panther 408
6 Tool Rotary Carousel
Recoil Lathe
Aspire 9.0

Be humble.
Be kind.
Be grateful.
Life is too short and prone to quickly change to live otherwise.
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Old 03-06-2018, 09:47 PM
Gary Campbell's Avatar
Gary Campbell Gary Campbell is offline
CNC Tech & Trainer
Join Date: Dec 2012
Location: Marquette, MI USA
Posts: 2,762

Questions for the OP...
What you describe is nearly impossible. I.E., a file that has run successfully multiple times, to develop errors in subsequent runs. The Z, or any axis for that matter, does not forget to raise. If in fact, it did not raise there is a cause.

A few questions if I may...
Did the machine return to its original XY and Z zero location?
Was the file run from a local drive on the control computer?
Were there errors in parts cut after the damaged ones?
Did you see it happen?
Are you sure the material did not lift?
Are you sure a part did not break free?
Do you have a picture?
Gary Campbell
CNC Technology and Training
The Ultimate Woodworking Machine

"There are 10 kinds of people in the world. Those that understand binary logic, and those who don't"
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