Mystery Lines

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Mystery Lines

Postby PeterM » Fri Aug 16, 2019 6:30 pm

Hello,
I've run into this scenario several times and am wondering about it...
After setting up a job, I import a model from AutoCAD in stl. format. After setting the tool paths, the machined part appears like the attached image. I'm confused why these lines appear, as the AutoCAD model I created did not have any of them. I've tried adjusting the preview simulation quality in the VCarve Pro software, but that hasn't seemed to do too much. My concern is that the lines would show up in the finished machined product. BTW I am using version 9.518.
Thanks,
Peter
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Re: Mystery Lines

Postby mtylerfl » Fri Aug 16, 2019 6:39 pm

After you have imported the model into your VCarve software, do you see the "lines" on the model when in the 3D view? If so, then the triangulation resolution that the model was exported with is not fine enough.
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Re: Mystery Lines

Postby martin54 » Fri Aug 16, 2019 7:21 pm

What modeling resolution are you using when you set up the job in vcarve before you import the stl file? Have you tried setting up with a higher resolution?
As Michael says what does the 3D model look like in the 3D view after you have imported it?
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Re: Mystery Lines

Postby sharkcutup » Sat Aug 17, 2019 4:32 pm

If model appears okay after you have checked what the others have provided for you to check.

Then this is my thoughts on the problem:

Sometimes during the tool path process material is left for the finishing pass and it will leave discrepancies that you have noted . Are the noted lines showing up after the finishing pass preview or are you asking this question before you continue on with finishing pass?

Just some thoughts!

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Re: Mystery Lines

Postby PeterM » Sat Aug 17, 2019 7:17 pm

Thanks everyone for your helpful questions.....

Some answers are:
Yes, I do see lines after importing the model into VCarve software. So I guess possibly the triangulation resolution I'm exporting from AutoCAD isn't fine enough.
I tried setting up the finest modeling resolution in VCarve, but that didn't change anything.
Even with a fine finishing pass in the highest resolution, the lines are still there.

I'll try a higher triangulation resolution export from AutoCAD and let you know how it works....if I can figure that out :)

Best,
Peter
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Re: Mystery Lines

Postby ger21 » Sat Aug 17, 2019 10:41 pm

If it's a solid model, type FACETRES in AutoCAD and set it to 10, then export.
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Re: Mystery Lines

Postby PeterM » Mon Aug 19, 2019 1:48 pm

Thank you! - in AutoCAD, setting FACETRES to 10 did the trick precisely.

I have been looking online for the way to remedy this same issue when exporting an stl from SketchUp. Would anyone have a suggestion with this?

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Re: Mystery Lines

Postby Adrian » Mon Aug 19, 2019 3:52 pm

With Sketchup it's a bit trickier as the facets (segments) are set when the model is drawn rather than at export time.
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Re: Mystery Lines

Postby PeterM » Mon Aug 19, 2019 8:34 pm

Okay thanks....that makes sense. I'll try to work the issue backwards to rectify this in SketchUp.
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