I am quite new to FreeCAD. I am having problems with Part Design -> Fillet creating strange artifacts on inside corners. I have tested this both on Linux (FreeCAD 0.18) and Windows (64-bit, FreeCAD 0.17 and 0.18).
I have attached a small modell which demonstrates the problem (a rectangle sketch is swept along a Z-shaped sketch, then the fillet is added).
Outside corners work fine and produces the desired results, but on the inside corners I get a strange twisting shape in half of each corner.
I am obviously doing something wrong. Any hints on how I can get around this problem?
I think this is normal: sketch001 runs around the corner of the sketch path, visible by the rounded corner of the outside corner, so inside there is the same rounded but invisible which prevents the filet from succeeding
this also happens using sweep of "PartWb
but if I make radiuss at the angles of sketch001 using PartWb the corner is well rectangle, but not using PartdesignWb or the corner is always broken
Thanks for the replies. The current behaviour kind of makes sense if one imagines a physical rectangle sweeping along a profile bent with sharp angles.
Anyways, I found a work around by adding the fillets to the sweep rectangle (creating a rounded rectangle).
I am slowly learning my way around FreeCAD. "Luckily" the delivery of my 3D printer has been delayed for a month, thus I have more time to learn (trying to find a positive angle here...).
There are shapes that should be, but aren't refinable. Loft sometimes creates such faces. Here the situation is different, the shape is refinable, as Part->Refine shows.
So the issue is that refine isn't working here.