Boring Holes into Curved Surface

Imagine a cylinder, but cut in half so that the cross section of
the object looks like a half-moon. I am trying to bore holes (fastener
holes, couterbores, etc) into the curved surface of the half-cylinder, but
(of course) perpendicular to its flat plane.

I have tried 2D sketch on the flat plane, an offset 2D sketch
(both above the curved surface and intersecting it), and a 3D sketch, but
I cannot get the holes to bore into the surface using the Hole Wizard. I
either get an error or the holes bore from the other (flat) side, which is
not the side I want.

What is the easiest way to get what I want? Any help? Thanks very
much,

Curry

 

Perhaps not use the hole wizard? Cut-revolve and cut-extrude?

 

Well, the problem with this is that I have no idea what fastener
holes I need yet; the design constraints could change. It's also easier to
see how different holes and hole features behave if you use the Smart
Dimension after putting the hole in with your design. I have to put holes
in around edges, so I have to make sure there is enough material to keep
it sturdy.

I'm sure there is a way to do what I proposed, but I don't know
the proper way. Thanks,

Curry

 

Thanks John!

That's exactly what I want, except I need the counterbores to be
perpendicular to the flat face of the object (and off-center). But I can
generalize from what you have already shown.

Thanks again!

Curry