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Author Topic: Unexpected Crop Circles  (Read 6316 times)

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Offline PaulWC

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Unexpected Crop Circles
« on: May 18, 2013, 03:48:08 AM »
I've been away from Mach3 for a few years, so am frantically clearing mental cobwebs...

I have a problem with my first major attempt with Mach3.

3D G-code generated from STL model using the latest version of MeshCAM. Code proofed in CutViewerMill... all good.

Run code on Mach3 R3.043.066 install on CNC router, runs great, then suddenly takes off in a large circle.

The stray tool path occurs at a G2/G3 IJ code line, and behaves like it loses reference for absolute IJ distances. There is a G90 line at the start of code.

Attached pic shows a large circle that occured while running at approx line 1800. The smaller circle happened when restarting the  code.

Any suggestions?

Offline Hood

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Re: Unexpected Crop Circles
« Reply #1 on: May 18, 2013, 04:45:49 AM »
G90 is not Abs IJ mode, it is  G90.1.
However if that is what you had please attach your xml and I will take a look.
Hood

Offline PaulWC

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Re: Unexpected Crop Circles
« Reply #2 on: May 18, 2013, 10:06:00 AM »
The G90 was inserted by MeshCAM. I can easily change it to G90.1. Couldn't find a ref to G90.1 in RS274NGC_3 Docs?

Starting XML attached. No General Config changes other than screen on running XML, which is a 20 mile trip away.

Thanks, Paul

Offline Hood

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Re: Unexpected Crop Circles
« Reply #3 on: May 18, 2013, 01:41:05 PM »
Can you attach the xml you are using at the moment as settings can be changed by code and yours may be different from that one.
Hood

Offline Hood

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Re: Unexpected Crop Circles
« Reply #4 on: May 18, 2013, 01:43:30 PM »
Also if you click on the button on the main page in Mach that says G Code you will get a list and explanations of the ones used by Mach.
Hood

Offline PaulWC

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Re: Unexpected Crop Circles
« Reply #5 on: May 18, 2013, 02:17:48 PM »
Can you attach the xml you are using at the moment as settings can be changed by code and yours may be different from that one.
Hood

Will do soon...

Offline ger21

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Re: Unexpected Crop Circles
« Reply #6 on: May 18, 2013, 07:14:19 PM »
You should have both a G90 and a G91.1, and they need to be on separate lines.
Gerry

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Offline PaulWC

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Re: Unexpected Crop Circles
« Reply #7 on: May 18, 2013, 07:15:52 PM »
OK... here's the current running XML

Offline PaulWC

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Re: Unexpected Crop Circles
« Reply #8 on: May 18, 2013, 07:16:13 PM »
You should have both a G90 and a G91.1, and they need to be on separate lines.

Done!

Thanks

Offline Hood

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Re: Unexpected Crop Circles
« Reply #9 on: May 19, 2013, 03:26:34 AM »
Ok first look of your xml and it seems fine.
Do you see the crop circles in your toolpath view?
Can you attach the code you are getting it with?

Hood