> Date: Thu, 10 Apr 1997 19:06:22 -0400 (EDT) > From: Jon Page <jpage@capecod.net> > Subject: Re: String breakage > To: pianotech@byu.edu > Reply-to: pianotech@byu.edu > 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). Hey how about the technician at the school?... > 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 > > > > > > > ilvey, RPT Pacifica, CA
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