Aha! was flat facts

[William R. Monroe]

Not sure if I made myself clear on that last bit, "What's more, this assumes
that friction is constant, whatever the pins position in the hole."  What I
mean is, if static friction has been overcome and the pin started to move,
is it not possible that after the tiniest movement, the pin encounters a
structural "something" in the block which results in an increase in friction
in that position, stopping the pin's movement?

Respectfully,
William R. Monroe

----- Original Message ----- 
From: "William R. Monroe" <pianotech@a440piano.net>
To: "Pianotech" <pianotech@ptg.org>
Sent: Monday, March 28, 2005 8:13 AM
Subject: Re: Aha! was flat facts


> Dean,
>
> True, static friction is greater than dynamic friction.  However, as long
> we're splitting hairs here, define jump.  What I mean is, it is easy to
> imply that if the pin overcame the static friction it would then make some
> large movement, resulting in a large pitch change.  I think arguing that
it
> jumps vs. makes micro movements becomes an issue of semantics.  Your jump
> can be my micro movement.  What's more, this assumes that friction is
> constant, whatever the pins position in the hole.  I'm unsure if this
would
> be the case or not.
>
> Respectfully,
> William R. Monroe
>
> ----- Original Message ----- 
> From: "Dean May" <deanmay@pianorebuilders.com>
> To: "'Pianotech'" <pianotech@ptg.org>
> Sent: Monday, March 28, 2005 8:00 AM
> Subject: RE: Aha! was flat facts
>
>
> > Static friction is greater than dynamic friction. If a tuning pin moves
> > it jumps, it does not turn in micro movements over time.
> >
> > Dean
> > Dean May             cell 812.239.3359
> > PianoRebuilders.com   812.235.5272
> > Terre Haute IN  47802
> >
> >
> > > -----Original Message-----
> > > From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On
> > > Behalf
> > > Of Ron Nossaman
> > > Sent: Sunday, March 27, 2005 11:38 AM
> > > To: Pianotech
> > > Subject: Re: was flat facts
> > >
> > >
> > >
> > >> I don't really buy into the "tuning pin turns" theory.
> > >
> > > Me either, nor the wire stretching. Music wire doesn't continue to
> > > stretch over time unless it's tensioned at it's yield point - then
> > > it stretches, necks down, and breaks.
> > > Ron N
> > >
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