On 2/21/2011 19:40, Pete C. wrote:

I think you should be looking for a tapered reamer.

Uh, yeah. Tapered end mills seem to be the only game in town, however.
The tapered reamers that I've seen are rated in inch/foot tapers.
Looking at Machinery's Handbook, the tapers are way too large.

Perchance a vernier protractor, dunno.