On Wednesday 06 November 2013 01:57:34 Jon Elson did opine:
> andy pugh wrote:
> > On 5 November 2013 18:41, Gene Heskett <[email protected]> wrote:
> >> 8-30 tap? Andy, even in our bastardized USofA numbering system,
> >> thats illegitimate. Are you also making the screws?
> >
> > The Rivett Lathe company already made the screws. Those are what I am
> > trying to match.
> > I already had to make some #8-40 screws for a different part of the
> > machine. (Yes, the same machine has #8-30 and #8-40 threads mere
> > inches away from each other)
>
Crazy!
> BOY, glad I don't own a Rivett! I hope they had a good reason for doing
> that!
>
> Jon
>
Hmmm, now an 8-40 or 8-48, one of the two, was used, in a specially
hardened form with a conical stud head, as a single screw per ring scope
mount, by the Bushnell Riflescope folks for quite a while circa 40 to I
don't know when it was stopped, years ago. It actually worked quite well
as it reduced the bending moment on the scopes tube from the usual pair of
6-48 bolts mount, and because the bases slot for the screw recess was
wider, it allowed the screws that grabbed the conical shaped section to be
used as the scopes windage screws, thereby centering up the scopes own
internal windage adjustments.
I always wondered if they were strong enough to live through the recoil of
a 338 NULA rifle though. Those only weigh 6.5 lbs, so the recoil is not a
little but a whole bunch sharp.
But, in 40 years, I don't recall reading that one of those studs ever
broke.
Point being that 8-40 and 8-48 was/is an available tap size to the
gunsmithing trade. If no place else, check Brownells.com.
Cheers, Gene
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
You can never do just one thing.
-- Hardin
A pen in the hand of this president is far more
dangerous than 200 million guns in the hands of
law-abiding citizens.
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