maybe what they are doing at the Bluthner factory is different from what I do but when I remove material the pitch goes up in my scratch test. Perhaps this is not the best test. Chris Solliday ----- Original Message ----- From: "Ron Nossaman" <rnossaman at cox.net> To: "College and University Technicians" <caut at ptg.org> Sent: Friday, February 22, 2008 10:25 AM Subject: Re: [CAUT] Shank Pitch > > > Chris & all > > > > I do know that to lower the pitch on a reed organ reed you scrape > > material from the bass end of the reed making the mass of the end of the > > tongue heavier in relation to the overall reed and the pitch goes down. > > I have never tried it on a hammer shank but I can see where the same > > principle would apply. > > > > Norman Cantrell > > Hi Norman, > In the organ reed, scraping the tip of the reed removes mass, > raising pitch. Scraping the base end of the reed decreases > stiffness, lowering pitch. > > Resonant frequency in anything is determined by a combination > of stiffness and mass. In the case of hammer shanks, it would > appear from the reported results that the loss of mass > realized in thinning has a greater affect on "doink" pitch > than the loss of stiffness. > > I don't tune shanks, so I wasn't aware of this. I would have > expected the shank pitch to drop. Interesting. > Ron N
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