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Problem with Arc Center Location Error
« on: January 26, 2013, 06:13:04 PM »
I'm having a problem where Mach3 (v. R3.043.066) is giving me error messages "Radius to end of arc differs from radius to start".  As I understand it, this message is only supposed to occur if the error is more than 0.0002".  I've checked the math and my calculations show the error at almost 10x less (0.00003").  The code was generated by MeshcamArt and runs fine under Cutviewer but not when I actually try to cut the part with Mach3.  Here's an example of the issue:

X2.2058 Y1.2136
G2 X2.2737 Y1.4341 I0.7115 J-0.0985 F10.0

Is anyone aware of any other reason this error message might occur?

By the way, I have other similar G2 moves that work just fine in the same program.  This also cannot be a hardware issue as I am getting the error on loading the code into a computer not connected to the NC router.

Thanks for any advice.

Offline Hood

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Re: Problem with Arc Center Location Error
« Reply #1 on: January 26, 2013, 06:42:40 PM »
Working fine here with that version of Mach loaded, maybe attach the full code your xml and I will see if its still ok. Not the greatest at G Code but may find something ;)
Hood
Re: Problem with Arc Center Location Error
« Reply #2 on: January 26, 2013, 07:39:07 PM »
Thanks for your assistance.  I extracted the bit of code and attempted to run it separately in case there was something else in the file that was causing the problem.  Got the same error.

Here's the entire file (all 18,758 lines).  The first problem occurs at line 7148

Brian

Offline Hood

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Re: Problem with Arc Center Location Error
« Reply #3 on: January 26, 2013, 08:16:02 PM »
Working fine here so looks like its a setting somewhere in your config, if you attach your xml I will load it and see if I can find the problem.
Hood
Re: Problem with Arc Center Location Error
« Reply #4 on: January 26, 2013, 09:02:30 PM »
Again, thanks for your continued help.  Attached is the XML.  By the way, the problem occurs with two different machines using different XML's although they came from the same base.

Brian

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Re: Problem with Arc Center Location Error
« Reply #5 on: January 27, 2013, 03:54:31 AM »
I think its your G16 in the initialisation string on General Config that is the problem.
Hood
Re: Problem with Arc Center Location Error
« Reply #6 on: January 27, 2013, 03:44:04 PM »
Thank you so much, Hood.  That did indeed fix the problem. 

I'm not sure how the G16 got into the Init string but putting G15 in the string fixed the problem.  (Without the G15, just deleting the G16 did not seem to work - it kept reappearing.)

Anyway, now I can mill!  Also for reference by others, the IJ mode (General Config) has to be "Inc"

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Re: Problem with Arc Center Location Error
« Reply #7 on: January 27, 2013, 05:06:02 PM »
If you had done a G15 from MDI and regenerated the toolpath it would have been fine.

IJ mode is dependant on the code and the mode it was written in, your code ideally should have a G90.1 or G91.1 at the start of it to tell Mach which mode it is in.
Hood