Exporting Sketch to DXF - Fillets not drawing correctly

[jonKPEFF]

Hi all - I'm having trouble with exporting a sketch to DXF. The part is very simple - a box rectangle, extruded to 0.25". When I Save as DXF, the resulting geometry is as expected. I then edited that sketch and added 10mm fillets to the corners. The extruded model in Fusion looks as expected, and the sketch is fully defined. When I Save as DXF with the fillets, the resulting geometry is wrong - I basically get an oval with a small bump on it. Any ideas? Thank you for any help you can provide!

Sketch in Fusion:

Resulting DXF:

[HughesTooling]

Can you attach the DXF file, you might need to ZIP it to upload to the forum. My guess is the DXF is OK but the program you're opening the file in can not read polly curves, this has come up before. Have you tried reimporting the DXF into Fusion?

Mark

[jonKPEFF]

I think you're right! I didn't think to import the dxf back into Fusion, but it does work as expected. So it's my other software: I'm trying open the file in dxf2gcode to eventually send it to a mill.  It doesn't have trouble with circular holes - do you know how the fillets are different? Is there a way to avoid them being encoded as....whatever they are, that round holes aren't?

I suppose I should just use the Manufacturing flow in Fusion to do this - something new to learn!

[HughesTooling · Accepted solution]

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@jonKPEFF wrote:

: I'm trying open the file in dxf2gcode to eventually send it to a mill. 

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Why are you using dxf2code? Can't you use the manufacture workspace in Fusion to generate code?

The problem you're seeing is because the profile is joined into a chain (polycurve) and some programs can handle lines and arcs in the same polycurve.

Mark

[jonKPEFF]

Thank you Mark! I appreciate your advice. I agree - the Manufacture tools in Fusion will do well. I've used dxf2gcode because it's incredibly simple for cutting multi-stepped 2d contours like I'm doing here - define a tool, load a DXF, export gcode. My mill is a little Chinese 3018 which has no axis zeroing, so I already have to manually set the machine zero to setup each job - the more advanced capabilities of Fusion (stock config, machine config, etc) just add complexity and that doesn't improve the final product. Except that hopefully I'll be able to have rounded corners on my part. 🙂

I started into learning the Manufacture tools and think I get it. Now to dial in my machine configuration, and I'll give it a try. Thanks again for your help.

[HughesTooling]

What control software are you using?

Mark

[jonKPEFF]

I'm using Candle GRBL Control. Open to all suggestions to streamline the new workflow!

[HughesTooling]

There is a GRBL post included with Fusion. As you don't have limit switches you could try setting safe retracts to Clearance Height. If you know how to set the control's machine origin(G53) it would be safer to use the G28 or G53 option though.

Mark