9/32 agraffes (DNA)

[Ron Nossaman]

At 08:46 AM 2/26/99 -0500, you wrote:
>OK Ron,
>
>So what _is_ the difference between a singe and a double cut helix
>thread?
>		Newton
>
>

Single helix has *one* groove and advances, in the case of 36tpi, 1/36th of
an inch per revolution.Double helix has *two* grooves running side by side
and would advance 1/18th of an inch per revolution at the same tpi. That's
it. Needless to say, the double helix won't fit a single helix threaded
hole. Even if I had a double helix tap to make a proper (used loosly) thread
for these ASOs, it would be a real bear to get them squared up and tight
with the fast advance rate of the double thread.  

 Ron