How to round hollow arc?

I’m puzzled by this seemingly simple problem. If I create a hollow arc, how to round it’s edges? The purpose is to model a hatch to model airplane.

What I’m trying to do is to round the corners. On top of the image is my attempt of drawing an arc and push/pull it away. Problem is that when hollowing the arc, that push/pull stops to the rounding I made.

Thank you for an example, followme seems really useful, but not quite what I was looking for (or I don’t get how I should use it). What I’m trying to do is to cut each of the four corners round, not to round the top edges. Badly drawn picture:

Do a search in the forum for either boolean subtract, or “intersect with model”.

I’d like to help, but I haven’t the foggiest idea what you’re trying to do. Just because you are cheerfully candid about the picture being drawn badly, that doesn’t mitigate the fact that it’s, well, drawn badly. Why not draw us a good one that gets the point across?


Right. Here’s a couple of pictures what I’m trying to accomplish. I’m trying to model a hatch for rc airplane. Looking at top it’s easy to do, just a rectangle with rounded corners:

Here’s when things go difficult (at least for me), looking from front you can see that the hatch top surface should have round surface:

(Image link here, I’m not allowed to attach second picture: )

Now it seems that I can either draw a rectangle with rounded corners to fit the hole, but the top side would be flat or I can draw a square hatch with rounded surface, but then I can’t figure out how to round the corners.

Thanks for your patience, I hope this clarifies.



Yeah, that makes all the difference. Now you have two more or less identical (well, quite similar) solutions:


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Thanks a lot guys, that was extremely helpful. Now I finally got it =)