<VV> valve seat set screw retention/tap sizes

[Roger Gault]

These numbers don't make sense.  Any kind of #5 screw (.125" dia) is going
to fall through a 9/64" (.140") dia hole.  Additionally, 5-32 is a
non-standard screw.  Perhaps the numbers are 7/64" tap drill and 6-32 screw.
That's close to the right size for a 6-32 tap drill, and 6-32 setscrews are
readily available.

Roger Gault

----- Original Message ----- 
From: "Tom Willcox" <bakwudz@rcn.com>
To: <virtualvairs@corvair.org>
Sent: Monday, April 19, 2004 6:32 PM
Subject: <VV> valve seat set screw retention/tap sizes


> I have a question regarding the "cromwell method" of valve seat retention:
> according to two different sources, I am supposed to finish drilling 1/4
> inch deep with a 9/64 drill, then tap with a 5/32 bottom tap, then insert
a
> 5/32 set screw.  After searching for hours, my question: is there such a
> thing as a 5/32 tap OR fastener?  The only things I have found smaller
than
> 1/4-20 are 8-32, 10-32, 4-40, etc.  Am I missing something obvious, or is
> this information incorrect?  Where can I find this stuff?  This is driving
> me nuts!  (short drive, btw)
>
> Thanks,
>
> Tom Willcox
>
>
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