Help using sweep to create an inverse fillet

jan_bader301

Hello,

I'm having trouble creating an "inverse fillet". My goal is to recreate the bottom fillet on a box for the top edge so they can be stacked easily.

Here's my current drawing. Sweep works nicely when I select the circle for the form and a single edge. As soon as I try to follow the edge and select one of the corners, OnShape fails because the sweep intersects. Doing each edge in a separate sweep doesn't do what it's supposed to - supposedly because of the circles orientation in the sketch.

My next try would be to create a sketch for each fillet, but that seems excessive and I hope there's a better way. Looking forward to any tips!

Thanks,
Jan

glen_dewsbury

Having the same fillet radius inside and out (10mm) does not give s good transition around the corners. The corner by that method causes a thickening at the mid point of filleted around the corner.

https://cad.onshape.com/documents/39513ab339bd67686ae45ebc/w/f9fa650b1b3024298632ac6a/e/c867a084dfd65722998f5c57

glen_dewsbury

Having the same fillet radius inside and out (10mm) does not give s good transition around the corners. The corner by that method causes a thickening at the mid point of filleted around the corner.

https://cad.onshape.com/documents/39513ab339bd67686ae45ebc/w/f9fa650b1b3024298632ac6a/e/c867a084dfd65722998f5c57

robert_scott_jr_

Hello Jan. How about stacking a couple and doing a Boolean Remove? - Scotty

eric_pesty

You need to remove the part of the circle that will "turn back on itself" in the corners.
Just draw a vertical line in you path (aligned with the inner wall) and only sweep the part of the circle on the left of it:

jan_bader301

Thanks a lot, that helped.