dxf export for laser/plasma creates duplicate layers

[supernetdude]

I've been searching the forums but haven't seen much of an answer to this issue.


I use F360 for milling, 3d printing, plasma, and laser. The laser doesn't use gcode so have to export dxf file. F360 plasma CAM isn't that great compared to Sheetcam for doing things like turning THC on/off, rules for slowing down on sharp corners, etc. So prefer to design in Fusion then export to DXF and generate gcode from Sheetcam.


The first problem is when exporting a sketch it includes all the extra construction lines and stuff I don't need. It would be great if I could export DXF without construction lines (feature request). So the easiest solution has been to do a small extrusion of the sketch, then create new sketch on top surface, project object, then export the dxf from that sketch. As some have noted, this creates duplicate lines on top of each other that sheetcam and laser machines will try to cut twice. Is there any fix for this? My current solution was from another plasma user who suggested opening in inkscape, ungrouping the lines, then moving some of the line segments off to reveal the single bottom layer. After doing all that, resave to dxf or svg and it will cut fine in plasma or laser. But this is a lot of extra work that we should have to do. Are there any plans to fix this so the single sketch from the extruded surface only includes 1 layer of lines?

[supernetdude]

Follow up for my issue:

I came across different post that happened to mention in profile > preferences > general > design there is check box for "auto project geometry on active sketch plane". I had this checked. I unchecked this, went back to my 3d extruded model, created new sketch on top surface, clicked project, changed selection filter to body, clicked body, and then ok. Closed sketch, exported to DXF, opened in Sheetcam and VIOLA! it works perfectly. So it appears to be bug in the auto project function, I think is project the top and bottom surfaces. If I have time I will try to create model that would have a different bottom surface and see if it adds lines for things that are on bottom surface as well as top surface.

[paul.clauss]

Hi @supernetdude

Thanks for posting! I found that I was able to recreate the duplicated sketch geometry you described - this appears to be an issue with the "Auto project geometry on active sketch plane" and the  Project command rather than the DXF export, as I notice the sketch lines are duplicated after the projection in the original sketch. This error is carried through when the sketch is exported in DXF format. 

I've logged a bug report (FUS-38574) with our development team to investigate a fix for this problem behavior - we appreciate you bringing this to our attention! As this is investigated, I would recommend disabling the "Auto project geometry on active sketch plane

With regards to exporting the sketches without sketch lines - this is a great feature suggestion for the Fusion 360 Ideastation! Please create an Ideastation post if you would like to see development consider including this option in a future update.

[supernetdude]

Paul -

Thanks for the help and logging the bug. I have a working solution now and will use that until the bug is fixed.

The request for dxf export without constraints was already made for laser cutting so I added my notes to that previous request.

Glen