Or another possibility is to do the chamfer along the entire area, then boolean union the end part so you have this:



Then if you copy this edge over:



You can then make a cylinder with Construct > Revolve:



Then boolean difference using the cylinder as the cutting object:



- Michael

Michael.
I tried your first trick to get the right chamfer easily enough, but I can't get my head around what you did in your second example, Could you do a short video showing how things are orientated and how you placed the axis of rotation for the cylinder, please?

Thanks.
Martin.

Hi Martin, I selected the edge and then ran the Transform > Copy command.

For the base point I clicked on the chamfer surface that is near the edge, then used surface normal snap to some distance away, looks like this:



- Michael

Thanks, Michael.
The video was most helpful. MoI's incredibly powerful snap & construction line combination is just great in all sorts of ways.

Martin.