Kuang, By 'force' rather than 'torque' are you _bending_ the pins? A big, big mistake. Torque is part of the 'setting the pin' process, there is also setting the string. I don't think you understand enough to be tuning yet (just deriving from your posts). I think you need to align yourself with a technician who will direct you in your persuit rather than formulating your own theories and experimenting on school pianos. Jon Page Harwich Port, Cape Cod, Mass. (jpage@capecod.net) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ At 12:45 PM 4/10/97 -0400, you wrote: > > >On Thu, 10 Apr 1997, Avery Todd wrote: > >> Kuang, >> >> This is something you should *seriously* consider changing. I don't know >> for a fact about that practice causing more broken strings, but it isn't >> necessary at all. You introduce a lot of tuning stability problems (which I >> believe you mentioned having in one of your earlier posts) and you add a >> lot of excessive wear on the tuning pin hole, which will eventually >> contribute to loose pin problems. > >I think loose pin problems could be avoided. I believe pin holes wear out >because of unnecessary forces excerted by the pin holes (don't they only >wear as result of years of tunings?). This is kinda hard to explain >though. If you only apply force ( _not_ torque), then the pin hole wall >must apply an opposite force unless your pin is not stationary (here comes >Newton's law of mechanics). However, if you apply a _torque_, then the >pin hole wall wouldn't have to oppose any force at all (well, except some >friction). If you constantly apply forces only on a pin, then the >diameter of the hole at the top is going to increase (the diameter at the >bottom probably won't change at all). If you want to veryfy this, >measure the diameters of a worn pin hole. How do you know if you are >excerting a torque and not force? Well, hold a tuning pin in the air, >and turn it using a hammer. If the pin stays stationary, then you're >excerting a torque. If not, then you're excerting a force. >In reality, this can mean alot of stress for your thumb though :< > > >> The tuning flat thread was primarily referring to a very slight "bump" >> on the pin to break loose any strings that were rusted at the pressure >> points. I can see no advantage at all of going a half step flat before >> pulling the string back up. But I can see a *lot* of disadvantages of doing >> so. >> Just my opinion. Thanks. > >That's a good point! Now I can see that it's really not necessary to >pull down a half step. > >> >> Avery >> >> >Ever since I began to tune flat before going up in pitch, more and more >> >strings break from tuning, _not_ playing. >> >> >I broke at least 3 strings while I was tuning last month. >> >The reason why so many string broke is because I always tune at least a >> >half note flat (100 cents) before going up in pitch (almost always). >> >> SNIP >> > >> >Kuang Wang >> >> _____________________________________ >> Avery Todd, RPT >> Moores School of Music >> University of Houston >> 713-743-3226 >> atodd@uh.edu >> http://www.uh.edu/music/ >> _____________________________________ >> >> >> > >Kuang Wang > >
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