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> Got any idea why Im getting what appears to be a rapid here?, G-Code Question
djb
post Oct 26 2008, 05:02 AM
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I was running a job today(or trying too) and i was getting a weird -z rapid at around line 650 or 850 (sorry dont remember which) It dropped fast enough to make the machine lose steps and I cant tell whats doing it.

N610 G3 X0.248 Y-0.85 Z0.364 I0.108 J-0.299
N620 G1 X0.789 Y-1.013
N630 G3 X0.889 Y-1.028 Z0.364 I0.121 J0.481
N640 G1 X1.786 Y-1.027
N650 G3 X1.913 Y-1.003 Z0.364 I-0.032 J0.531
N660 G1 X2.458 Y-0.838
N670 G3 X2.422 Y-0.23 Z0.364 I-0.108 J0.299
N680 G1 X2.247 Y-0.177
N690 X2.175 Y-0.417
N700 X1.805 Y-0.307 F10


N810 G3 X2.375 Y-0.478 Z0.364 I-0.028 J0.061
N820 G1 X2.175 Y-0.417
N830 G2 X2.163 Y-0.407 Z0.364 I0.006 J0.019 F20
N840 G1 Z0.614
N850 X2.335 Y0.063
N860 G2 X2.319 Y0.062 Z0.354 I-0.01 J0.018 F10
N870 G1 X1.931 Y0.177 F20
N880 G3 X1.786 Y0.197 Z0.354 I-0.177 J-0.744
N890 G1 X0.86 Y0.196

Got any ideas?

David


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Sprut_UK
post Oct 26 2008, 07:33 AM
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Lines 840 -> 860 don't look quite right. On line 840 the Z is doing a linear move up to 0.614, and on line 860 there is a clockwise arc which also plunges the Z (helix ?).
I wouldn't have expected this to cause a rapid move though........
The G-code doesn't really tell us a lot, we would need to see your project and postprocessor to be able to work out what is going on.

Dave


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djb
post Oct 26 2008, 03:39 PM
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QUOTE (Sprut_UK @ Oct 26 2008, 07:33 AM) *
Lines 840 -> 860 don't look quite right. On line 840 the Z is doing a linear move up to 0.614, and on line 860 there is a clockwise arc which also plunges the Z (helix ?).
I wouldn't have expected this to cause a rapid move though........
The G-code doesn't really tell us a lot, we would need to see your project and postprocessor to be able to work out what is going on.

Dave


Dave, thanks for the response!

Heres my project: http://gtmbuild.com/misc/project.stc

Heres the sprutcam post: http://gtmbuild.com/misc/PCNC1100_1-17-08.spp

I have my plung set through drill point with an approach set to a 45 degree angle and a .02" radius. I use this method regularly and have never had a problem. I ran the program twice, resetting the machine and it didnt seem to make a difference, so am wondering if these exact settings are exposing some bug somewhere in my control software or the post. Got any ideas?

David


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Sprut_UK
post Oct 26 2008, 05:45 PM
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David, the problem appears to be being caused by the 'Z cleanup parameters' option (Strategy tab) in the Waterline roughing operation.

What is happening is that for some reason SprutCAM is creating a very coarse helical plunge move which I think that your control is probably having trouble interpreting:



If you turn off the 'Z cleanup parameters' then the strange move is not calculated. Your revised project is available here

I would suggest that you pass this on to your SprutCAM dealer or direct to Sprut Russia for their analysis.

Dave


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djb
post Oct 26 2008, 11:47 PM
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Thanks Dave.... really really appreciate it! I turned off the approach via curve and used the tangent option and it seemed to work also. At least I know what the problem is now. I will send this report to Tormach and Yuri! Thanks again... biggrin.gif David


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