Verdigris

[Jim Coleman, Sr.]

Hi to all:

Experience has shown that teflon bushings get tight in the dry weather 
and click in the humidity weather.
 
The explanation is that as the fork of the shank expands with humidity,
the hole for the bushing widens. (I know this seems backwards when one
thinks of humidity tightening tuning pins, but that is another principle)
When the shank is dry, the fork shrinks and squeezes the teflon making 
the pin tighter.  If you do not agree, just look up all this stuff when
we discussed it about a year ago.

Jim Coleman, Sr.

On Mon, 16 Feb 1998, Jon Page wrote:

> At 11:23 PM 2/15/98 -0800, you wrote:
> >I'm not so sure this is the case. Fred gave a class some time back
> >wherein he espoused the value of teflon centers. He dropped a hammer and
> >flange into a glass of water at the beginning of the class. At the end
> >of the class, he pulled it out of the water and showed that it had the
> >same tightness as before it got doused.
> >Thomas A. Cole RPT
> 
> I saw a similar demo. Humidity shrinks teflon so the water-logged
> s/f was so loose the pin knocked.
> 
> 
> 
> Jon Page
> Harwich Port, Cape Cod, Mass. (jpage@capecod.net)
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