Need to do cut-outs in arc

[john_mcclenahan]

This thread is essentially a duplicate post of

I've been trying to cut a hole for 30 minutes and I'm just frustrated and at a loss

Inner Arch and inner curve.skp (689.1 KB) I have a similar problem, but a bit more complicated. I have to cut rectangular holes in a arc side going all the way around 180 degrees. The holes have to be 1 per segment and there are 172 segments in the arc. I got the first one with great difficulty, as you can see in the attached .skp file, but the next one seems askew and won’t sit on the face. Is there a way to lock in the correct rotation? Also, since I am ascending up the arc, I have to ro…

Could a moderator combine them?