Bravo. Bernhard Stopper Richard Brekne schrieb: > I was going to mention something along these lines but had decided to > not... but since you bring this in.... > > It is of course interesting to delve into as much as you can. I have > my own project going with explaining pitch changes due to string > deflections at the bridge and and with the help of PhD Alexander > Galembo arrived at a set of math formulas for calculating change in > pitch for change in length. This employs Hookes law and is a different > approach then using elongation formulas... which I have yet to see a > sensible explanation for in this context. Regardless of approach... > one is immediately confronted with a host of friction moments and it > gets very iffy for more then very general querries right away. > > In the end... as related to the present issue... about all you can > model with maths here is how much increase in tension a free standing > string will experience for any given amount of movement for a pin of a > given diameter. Once you start adding termination and other friction > points as in a real piano you are not going to get much of anything > meaningful with math models... only hints of what <<should be>> under > uniform and ideal conditions... which of course never are in existence. > > In the end... a techs job is from a practical perspective a matter of > feeling, touch, listening... and putting these together to arrive at a > sensation of <<knowing>> what the string and pin are doing for > whatever kind of stress you are exerting on them. That takes > experience... lots of it. The rest is academic... interesting... > perhaps useful.. perhaps as much a goose trail as anything else > depending on the tech pursuing the trail. > > Cheers > RicB > > > Theory and Practice of Piano Tuning by Brian Capleton has a 40 page > chapter on Setting the Pin. > www.amarilli-books.co.uk > > Ed Sutton > >
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