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Ovals that aren't ovals

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BanksAg
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Ovals that aren't ovals

Postby BanksAg » Tue Dec 12, 2017 6:17 pm

I'm hoping someone will have some ideas for me to try. I'm working on a sign with a name & wedding year inside of an oval frame. It's drawn in Rhino 3D, which I don't know if anyone else on here uses; it's along the same lines as AutoCAD, SolidWorks, etc. I have to export it as a dxf to import it into Sheetcam (Rhino doesn't do svg's). I've played with the export settings and tried earlier dxf versions, and get one of two things: 1) the outer oval is distorted or 2) any of the curves end up faceted instead of smooth. I attached picture of what it looks like in Rhino, along with what I'm seeing in Sheetcam, as well as the dxf files. I don't seem to have any issues with circles, other curves, or straight lines. Is there something unique about the geometry of an oval that could be giving me problems? I even tried drawing a couple of other ovals in another file, and I get the same issues.

Thanks for any thoughts you might have.

Tim

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Tim Eggleston
Banks High School
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acourtjester
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Re: Ovals that aren't ovals

Postby acourtjester » Tue Dec 12, 2017 8:36 pm

I would switch from Rhino to Inkscape projects like that are very easy to construct as you can convert normal fonts to paths. It will do all kinds of shape following with the letters, it welds letter to lines. And it saves in SVG or DXF file formats, FREE for download too a large number of tutorials on the web too..
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East German
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Re: Ovals that aren't ovals

Postby East German » Wed Dec 13, 2017 7:49 am

Hello Tim

I do not know the program. I opened it with VCarve and saved it then it works.

I hope this help!?

Peter

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Re: Ovals that aren't ovals

Postby Old Iron » Wed Dec 13, 2017 9:44 am

I'm with Tom on this one.
I use a combination of Inkscape, Qcad and then go to Sheetcam for a lot of my processes.

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Re: Ovals that aren't ovals

Postby bhamer62 » Thu Dec 14, 2017 1:43 pm

An ellipse is considered a spline in many CNC cutting machines, they just don't care for them... They won't polyline in ACAD at all so I don't use them in ANY design....period. Draw your stuff using 3 point arcs and practice blending the start stop points to give a smooth transition Works for me....

BanksAg
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Re: Ovals that aren't ovals

Postby BanksAg » Thu Dec 14, 2017 4:42 pm

Thanks for the input guys. I'll try playing with arcs in the future to see if we can make that work.

I do have, and can use Inkscape, but to be honest I don't like it near as much as a good CAD program, and since I offer college credit through our local community college for Rhino I need to stick with that as much as I can.

Thanks for the help.

Tim
Tim Eggleston
Banks High School
Banks, OR

Arc Pro 4800
PowerMax 45XP
Mach 3, SheetCam
Inkscape, Rhino 3D

Old Iron
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Re: Ovals that aren't ovals

Postby Old Iron » Thu Dec 14, 2017 6:26 pm

Qcad draws eclipse with no trouble and my CNC plas will cut, with no issues.

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MemFor
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Re: Ovals that aren't ovals

Postby MemFor » Thu Dec 14, 2017 8:26 pm

Some reading into splines vs polylines might give you some insight. I recently learnt all programs do not interpret curves the same way.

This link might help: https://discourse.mcneel.com/t/save-as-dwg-arcs-become-line-segments-and-circles-become-octagons/21505/7


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