On Fri, 07 Aug 2009 00:40:27 +0000, Stealth Pilot wrote:

On Thu, 06 Aug 2009 11:15:50 -0500, Tim Wescott
wrote:

On Wed, 05 Aug 2009 22:24:52 -0400, Ned Simmons wrote:

On Wed, 05 Aug 2009 20:53:04 -0500, Tim Wescott
wrote:


They may be 55 degrees, but they sure as heck aren't 1/8" OD -- the
shaft measured too close to 3mm to be anything else, and the OD of the
threads was definitely 3mm, too.

The limits on the major diameter of a 5-40 UNC-2A thread are
.1242/.1191 -- within .001 of 3mm.

Hmm. Clearance hole for 5-40 is 1/8, this is definitely smaller than
that.

just another thought. why not borrow the accordion and run a tap through
the hole that *is* a size you can match parts for.

Stealth Pilot

That's not an issue -- the piece was broken but good; I had to make an
entirely new one. The replacement uses 1/8" drill rod ('cause I had it)
turned down on the ends and threaded 4-40.

I just thought it was neat to find this interesting bit of historical
trivia sitting in my hand, and even better to be able to use it to pull
my sister's leg a bit.

--
http://www.wescottdesign.com