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I realized this should probably be here. Cutting issue and G-code translation error?

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Taliesin77
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I realized this should probably be here. Cutting issue and G-code translation error?

Postby Taliesin77 » Fri Apr 20, 2018 11:26 am

I have a Hypertherm 65 on a Hornet cutting table, and I just started having issues with cutting all the way thru the material. It seems to be with Finecut consumables are having problems with all gages of material. I changed all the consumables, including the swirl ring, but still got this when cutting 3/16".

Image
So I changed to standard consumables, and the toolpath has a translation error in the "teeth" of the part( seen on the right side on the middle cut-out).

standard consumables gave me this:
Image

Here's a picture of the toolpath:
Image

I thought it was maybe a one time thing, but I got the same when I tried to cut it again.
Image

Any help would be appreciated.
Last edited by Taliesin77 on Mon Apr 23, 2018 9:30 am, edited 1 time in total.

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acourtjester
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Re: I realized this should probably be here. Cutting issue and G-code translation error?

Postby acourtjester » Fri Apr 20, 2018 1:10 pm

I would say you have a movement problem, holes are not round and the 2 hole on the line are not shown that way in the drawing.
And the beginning and end of the cut path do not meet. YOu may have a loose connector to a axis motor. The teeth as you call them could be the drive is skipping and not moving. They all seem to be in the same axis direction.
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Taliesin77
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Re: I realized this should probably be here. Cutting issue and G-code translation error?

Postby Taliesin77 » Fri Apr 20, 2018 1:17 pm

acourtjester wrote:I would say you have a movement problem, holes are not round and the 2 hole on the line are not shown that way in the drawing.
And the beginning and end of the cut path do not meet. YOu may have a loose connector to a axis motor. The teeth as you call them could be the drive is skipping and not moving. They all seem to be in the same axis direction.



acourtjester, the cut with the finecut consumables followed the correct toolpath, they just didn't cut through (which is one issue I am also wondering about). The change from finecut to standard consumables is what brought the toolpath error. The fact that the exterior cut without problem makes me believe it is a software issue, not a mechanical, axis motor issue.

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acourtjester
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Re: I realized this should probably be here. Cutting issue and G-code translation error?

Postby acourtjester » Fri Apr 20, 2018 9:51 pm

I don't think fine cut is for 3/16" (0.1875") book stated 10 Ga max (0.1345").
Maybe another poster will voice their Idea, Changing tip should have no effect on the path the torch moves.
DIY 4X4 Plasma/Router Table
CandCNC DTHC-IV & Feather Touch
Hypertherm PM65 Machine Torch
Drag Knife and Scribe
Miller Mig welder
13" metal lathe
Small Mill
Everlast PM 256 tig

Taliesin77
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Re: I realized this should probably be here. Cutting issue and G-code translation error?

Postby Taliesin77 » Mon Apr 23, 2018 9:33 am

Here is a picture of the toolpath trace on the monitor:
Image

You can see that the red line is the actual movement of the torch and the green is the intended path.

plasmanewbie
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Re: I realized this should probably be here. Cutting issue and G-code translation error?

Postby plasmanewbie » Mon Apr 23, 2018 10:14 am

I have seen that before where the torch begins tracking off the correct path at a certain point. In every case I have seen there will be a funky line, loop, or something of sort at the location where the torch begins tracking wrong. Often you need to zoom in VERY close in CAD to see this. Can you upload the file so we can have a look?

Taliesin77
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Re: I realized this should probably be here. Cutting issue and G-code translation error?

Postby Taliesin77 » Thu Apr 26, 2018 2:13 pm

plasmanewbie wrote:I have seen that before where the torch begins tracking off the correct path at a certain point. In every case I have seen there will be a funky line, loop, or something of sort at the location where the torch begins tracking wrong. Often you need to zoom in VERY close in CAD to see this. Can you upload the file so we can have a look?

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plasmanewbie
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Re: I realized this should probably be here. Cutting issue and G-code translation error?

Postby plasmanewbie » Thu Apr 26, 2018 3:05 pm

Well I had a look at your dxf and don't see anything strange so I'm stumped. Sorry I couldn't help :?

all names have been taken
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Re: I realized this should probably be here. Cutting issue and G-code translation error?

Postby all names have been taken » Tue May 01, 2018 8:53 pm

Did you get this solved? I may have an idea. If you did get this figured out, could you fill us all in?

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Re: I realized this should probably be here. Cutting issue and G-code translation error?

Postby Stout » Wed May 02, 2018 10:46 am

I looked at the file also and did not find any issues. The facts:
The finecut example completed the job without a motion issue so the drawing seems to be OK.
The controller seems to know where the torch was when it did not follow the path which means that the motion and the controller appear to be operating properly.

I am starting to suspect you have some type of hi frequency bleed causing a drive or motor to move. If you are compiling your G code as incremental, then the motor may have moved due to a voltage or hi freq problem. The controller just says to move from wherever it currently is to this direction for this this length. In absolute mode, every movement is based on 0.0 position so you may be able to compensate for any outside interference. You might try changing your coordinate system to absolute.
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