--- 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 __________________________________________________ Do you Yahoo!? Yahoo! Tax Center - forms, calculators, tips, more http://taxes.yahoo.com/
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