Beginner: Maintain consistent thickness rounding off inner/outer walls?

[Anonymous]

I'm surprised I'm having such a hard time finding answers to this question.  I expected it to be somewhat common.

I used the Shell feature on a box extrusion to create wall thickness on my object.  I want to now round the corners of the box, but I can't find the appropriate way to do this.

If I apply a fillet to the inner and outer edges of the corners of the shell, I need to calculate the radius manually for each if I want to keep a consistent wall thickness along the curve.  Seems I'm not using the best approach.

As an example, in the below image you will see that the straight parts of my shell are narrower than the curved part because the fillet radius is the same on both sides.  Something better than fillet to use for this?  Tips?

[etfrench]

Try filleting before shelling.  You may be able to move back in the timeline to do this.

[Cotral.RD2 · Accepted solution]

As etfrench replied its better to fillet the exterieur surface before shell operation.

If this is not possible you need to create two fillets. Just substract the thickness of the body from the outer radius to get the inner radius

Example if the thickness is 13 mm and the radius of exterieur fillet is 14mm then the inner fillet must be 1mm to have a constant thickness

do not forget to accept the solution in case you found it useful

[Anonymous]

Thanks to both of you.  I don't want to go back early in my model (shell was created very early on) so I'm just going to do separate fillets with calculated radii..  I didn't realize it was that straightforward

I use variables for dimensions of almost everything in my model, so I can just set outer radius to edgeRadius and inner to edgeRadius-wallThickness .. this seems like the best option in my case.

I thought there might be a different tool I wasn't aware of that was meant for this purpose

thanks again

[workshop3WSY]

Thanks a lot@Cotral.RD2 for this very good explanation. I had the same question / problem and your answer solved it perfectly.