Large Gouge in 3d finishing

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Large Gouge in 3d finishing

Postby infamous_panda » Wed May 01, 2019 2:19 am

Gents,

My machine took a big chunk out of my sword handle early in the finishing process. The gouge does not show up in the toolpath viewer..... re-posted the program with a slightly different max depth and ran it on the other side since the piece was still usable now I ended up with 2 gouges! Funny thing is that the rest of the program runs fine after gouging.

System is windows 10
UCCNC 1.2109 with UC100 connected to a G540
Fusion360 for post

gcode attached

https://photos.app.goo.gl/enBFaB96nEwWasvU9

please help
Attachments
sebastisword handle finish.tap
(133.22 KiB) Downloaded 491 times
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Re: Large Gouge in 3d finishing

Postby cncdrive » Wed May 01, 2019 7:15 am

You Z axis motor stalled I guess. Maybe too high speed or too high acceleration setting.
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Re: Large Gouge in 3d finishing

Postby infamous_panda » Wed May 01, 2019 10:12 am

My understanding is that a stalled motor will have lost steps and the rest of the of the path would be off. These gouges are near the very beginning of the job. The rest of it runs fine.
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Re: Large Gouge in 3d finishing

Postby RWC » Wed May 01, 2019 11:00 am

I'm curious why you start in the G17 plane then switch to G18 near the gouge ? ? ?
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Re: Large Gouge in 3d finishing

Postby infamous_panda » Wed May 01, 2019 11:04 am

Here is the backside of the part, running the same program. There are two gouges.

Another weird issue is looking at the pattern of the finish has some scalloping artifacts. The lines should be parallel, but instead it looks like the Z moves at a very slight angle. It's not a bad look in this case but it's wrong.

https://photos.app.goo.gl/gbv7f3qzS6ncChum7
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Re: Large Gouge in 3d finishing

Postby cncdrive » Wed May 01, 2019 11:32 am

OK, we will debug this, but today is a national holiday here, will check it tomorrow to see if we see the issue.
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Re: Large Gouge in 3d finishing

Postby infamous_panda » Wed May 01, 2019 12:57 pm

Okay,

It's an Issue with UCCNC. Ran the same program in Mach3 and it's perfect. I did a comparison with the Z slightly lifted since I did not run a roughing pass first and I did not want to take a very heavy cut. The Z in both instances are equalized. The issues with the UCCNC cut:

1. Big gouges near the start of the program. On a previous version of this file there was only one gouge.
2. Scalloping on the parallel finishing. Seems that the passes move in an slight arc rather than straight lines
3. The overall Z-cut depth seems slightly lower than in Mach.

Please help ASAP. The timing of this is very inconvenient.
Attachments
MVIMG_20190501_084158.jpg
MVIMG_20190501_084154.jpg
MVIMG_20190501_084147.jpg
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Re: Large Gouge in 3d finishing

Postby infamous_panda » Wed May 01, 2019 1:14 pm

RWC wrote:I'm curious why you start in the G17 plane then switch to G18 near the gouge ? ? ?


I don't know... My limited knowledge on Gcode programming prevents me from digging deep into Fusion's output. I did read a little on those commands from your note and think you are on to something relating to how UCCNC is interpolating a circle. The cuts appear to be very slight arcs instead of straight lines. However the toolpath window does look correct so I'm really at a loss. Maybe there is a setting in Fusion to clear this up.

Whatever the case Mach3 seems to produce the intended result.
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Re: Large Gouge in 3d finishing

Postby ger21 » Wed May 01, 2019 1:23 pm

Have you tried UCCNC 1.2049?
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Re: Large Gouge in 3d finishing

Postby cncdrive » Wed May 01, 2019 3:06 pm

What are your CV path tolerance settings BTW? (General settings/Constant velicity parameters)
I'm asking this, because your code seems to be low coordinates values, so it seems to be inches, so maybe your tolerances are so high compared to the coordinates that it causes these visible path errors.
For Linear error max. and Corner error max. try 0.001 if your units are inches. (Which seems to be from your g-code.)
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