[tlharris]

Hi all -
Scratching my head on this one for a while now.... not really a showstopper, I just don't understand it.

I'm trying to cut these out of plywood, and I typically bisect the inside corners of notches for fit clearance. This one, however, doesn't want to recognize 'inside' as 'inside'. I export the faces out as DXF from Inventor, and open in BC v25 Pro. I've tried contouring the shape, reversing it, and running as straight lines.

Any ideas?
Thanks -

[jrmach]

I don't know why,and I do not know how,But your Arcs are bad geometry.I re-drew your arcs using 3 Entities method,and all is good.Make sure your arcs are what you want.When I put a point on your arc at 50 percent,the point did not seem to be on the arc.Something going on with file.Someone more knowledgeable maybe chime in.Anyhow,if the arcs I re-created look good,you are in business.

[tlharris]

Thanks, JR.
FWIW.... and maybe this is more of an Inventor issue than a BC one, but I'll share anyway -

My usual workflow to grab 2D faces in Inventor and Export Face As.... and send out as DXF. I usually use DXF2010 format, which BobCAD likes just fine. (If I'm sending to our creative team, who uses Adobe Creative Cloud, then I have to dumb it down to DXF2000 for Illustrator) The vast majority of the time, I have no issues.

In Inventor, if I split a face, and then export one part of it as a DXF..... that's when these weird anomalies creep in. Only happened a couple of times. One fix, as you offer, is to recreate the geometry in BC. This definitely solves the immediate problem, but I try to avoid this, as there's always a chance - as I think you suggest - that some of the design intent may have gotten lost in the recreation. i.e. the new geometry approximates the old well enough, but you never know really how far off it it is or why.

The alternate that I came up with is just to export the solid from Inventor as a SAT, and work with that in BC. This seems to work fine, and it's what I do for all 3D elements anyway.

Thanks for tinkering with this. Sometimes way easier to understand what's happening with a couple of sets of eyes on it.

Cheers -
Todd

[BurrMan]

The "Bad Geometry" is not bad geometry with the point issue. Just set the wireframe display quality to a higher value to see the arc where it actually is, intersecting with the point.

I couldnt figure out "why" the geometry acted up like that. A quicker fix than re-drawing the arcs is to just run arc fit on the entire batch, then reselect. I think you'll have to make a contour after that to control the specific direction.

For sure just bring in the SAT file and get your edges from that in BobCad. It will just save on translation of entities....