I'm building a 4140 3" rivet squeezer yoke out of 4140. Here's a
couple of pictures as examples:

Yoke itself -
http://www.averytools.com/images/variant/icon/1124.jpg
Mounted on squeezer -
http://www.clearairtools.web.aplus.n...%20New%20S.jpg

I think of machining the profile from 1/2" bar stock, drilling the
holes, and then having it heat treated to Rc 42-46.
However, this is my first go at heat treating and I'm concerned that
growth and warpage are going to be a problem.

Will this process work or should I heat treat first and then machine/
drill? Is it feasible to drill 7/16" holes through 1/2" of Rc 46
steel?

Thanks for the help,
-DC