Dust-free finishing for soundboards.

[gordon stelter]

--- Delwin D Fandrich <pianobuilders@olynet.com>
wrote:
> 
> ----- Original Message -----
> From: "gordon stelter" <lclgcnp@yahoo.com>
> To: "Pianotech" <pianotech@ptg.org>
> Sent: March 03, 2003 6:26 AM
> Subject: Re: Drying pinblock before stringing-slight
> clarification.
> 
> 
> > I still disagree, Ken. As I have experienced
> plenty of
> > pianos develop looser pins in winter, when the
> > humidity is low, I believe that this will "open
> up"
> > the holes a little prior to stringing, preventing
> some
> > fiber tear on pin pounding and then the pin will
> be a
> > little tighter when the EMC rises. As I am not
> going
> > to test this scientifically, and as  I am a
> neurotic
> > compulsive perfectionist with a "better safe than
> > sorry"-"do my very best for the customer" complex,
> I
> > will continue this practice until someone shows me
> > hard scientific evidence, not just their opinion,
> that
> > it is worthless.
> >      Have a Nice Day!
> >      Thump
> 
> Well, it is a fairly well researched and documented
> fact that a hole of
> given size in a piece of wood expands and contracts
> along with the expansion
> and contraction of the wood. This is Basic Wood
> Technology 101. Check R.
> Bruce Hoadley's 'Understanding Wood' for details.
> 
> So, since the change in tuning pin torque you are
> finding is also real and
> well documented, there must be some other mechanism
> at work here.
> 
> Since this subject comes up from time to time there
> is an accumulated (and
> accumulating) amount of information in the archives.
> One I have brought up
> in the past (others as well, I expect) is that the
> coefficient of friction
> between the metal pin and the wood surface changes
> as the moisture content
> of the wood changes. It decreases as the moisture
> content goes down and
> increases as the moisture content goes up. I've no
> idea if this change is
> enough to account for the variation in tuning pin
> torque felt in some pianos
> but, if it were a question I was interested in
> enough to do some research
> answering, this is where I'd start....
> 
> Del
> 
> 
> _______________________________________________
> pianotech list info:
https://www.moypiano.com/resources/#archives


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