Hmm, rechecked my math, looks like the .750 OD is what I want for the
base, wall thickness @.0625, sight block of 3/16 (.1875), sight .550,
barrel CL to surface .312, add em up and it's 1.112, minus the concave
sight base (.005 or so).

Tool post grinder. Erk. Lessee, start looking through the usual suspects...


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.

The compound isn't intended for cutting accurate shallow tapers, that is
why taper attachments for lathes exist. You will likely have to go by
trial and error, test cutting some scrap and test fitting until you find
the correct setting.

Some of the tapers I used to turn on the lathe compound were .0025" taper in
~3" for facing 33rpm record dies IIRC. First I'd cut the face with the
slight taper, then grind with the tool post grinder feeding 0.0002" at a
time. The compound can work for cutting shallow accurate tapers if set up
properly.

RogerN