Hi all. New to Lightburn and really enjoying it.
I’ve been making sketches in Fusion 360 and then importing those into Lightburn as DXFs. It’s mostly been fine but I’m having an issue on one particular file with arcs. The issue is that one of the arcs gets noticeably skewed/twisted when imported into Lightburn - all the other geometry seems to be ok. It’s the center-right arc. You can see the sketch in Fusion has 4 regular arcs at the center. But, imported into Lightburn one of these arcs, the right most one, is twisted. I made a quick dummy file with just four arcs and a centerline and it’s being imported correctly. So, not sure what could be going on here. I’ve tried a few things like deleting the twisted arc (in Fusion), and mirroring the one from the correct, left side. Didn’t fix it. I also made a second sketch where I projected all the lines from the original sketch to see if that would change anything - nope. The arcs aren’t fully dimensioned (in blue) but there are other sketch elements that are not fully dimensioned and those seem to be imported fine. Any ideas? I suppose I could rebuild the full sketch I want from the test sketch (given that the test sketch arcs appear to be importing correctly), but was hoping to understand what might be going on here. Is there a better, “cleaner” way to go from a Fusion sketch to Lightburn other than using the Sketch - Save as DXF feature? Thanks!
Can you upload your DXF to have a look at? BTW, you’ll probably have to add a ‘.txt’ extension to the file otherwise I think the forum software will reject it.
Fully define the sketch should do the trick.
I fully defined the arcs, then imported into LB. The result is actually worse than before - more of the arcs are twisted. Seems very strange.
I went back and fully defined the entire sketch, not just the arcs. Looks like it imported correctly. I guess the lesson is to fully define or at least lock a sketch before importing.
The DXF file that is getting twisted is attached. It looks like I can get rid of the twisting effect if I fully define the sketch but it still seems weird that only one non-fully-defined element would get distorted.
05DXFTEST01.dxf (5.3 KB)
There’s something very odd going on here. I’ve opened your DXF in a number of 2D CAD programs as well as AutoDesk DWG TrueView and CorelDraw 2018. It looks as you’d expect in all of them, however if I import it into LB I also get the weird double curve as in your screenshot. I think @LightBurn might like to take a look to see what’s going on. Quite why fully defining the sketch in Fusion 360 fixes it doesn’t make any sense at all to me because any associativity and constraints will not be exported in the DXF.
Ok, thanks for checking. Good to know it’s not just me going crazy. Curious if LB can advise.
Jimcoy - we have a winner! That fixed it. Mine was set to some small value. Before (left) and after (right) changing that setting to zero. Thank you!
Well that’s a bug. Found and fixed for the next release. This is with the auto-join still enabled:
Cool. Appreciate you guys checking into it and addressing it. I’m new to LB and so far enjoying it. This forum is a big help too. Cheers.
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