I'm not so sure that just because static friction is broken by rendering = in the horizontal plane, that it would be broken in the vertical plane = at the same time. Hmmm... guess its time for me to check with my local = phycisist again. In addition, I think it should be pointed out in this discussion that = the downbearing of an individual string is fairly small - on the order = of a couple of pounds. So the friction required to keep the string = slightly off of the bridge isn't that great As to the ability of the hammer to lift the string off of the bridge. = I'm not as sure of that as I was a couple of weeks ago (this list will = do that to you) I think, as Ron Says, that humidity shifts have a lot = more to do with it in normal circumstances. I do maintain, however, = that a hard blow, especially in the upper treble where the hammer is a = lot closer to the bridge, can create some movement. John McKone, RPT St. Louis Park, Minnesota (612) 280-8375 "Sleepless in Minnesota" ----------------------------------------------- >From : Ron Nossaman <nossaman@southwind.net> Sent : 04/17/97 I've been wondering myself if a hard blow CAN drive a string up a bridge = pin, or if it's exclusively a humidity swing thing. It seems to me that a string rendering through the bridge would tend to = seat itself by virtue of downbearing once the stagger friction is = overcome and the string is sliding. You can pound a string flat (pitch = <G>) and have it come back up somewhat (I've seen it in about octave 6, = where all the weird stuff happens) without touching the tuning pin at = all. If the string has moved THROUGH the bridge pins, wouldn't = downbearing pull it down too? If a pianist CAN unseat strings it would = pretty much have to trash the unison tuning. Regards, Ron Nossaman At 05:24 PM 4/16/97 -0700, you wrote: >One small question keeps occurring to me as I read this thread: > >If, as seems possible, hard blows are enough to cause the strings to = ride up >on the bridge pins, and stay there, is it a good idea to reseat them? > >Would it be better to consider who is going to play the piano next? = What if >the next performer is heavy handed, and will drive them right back up? = Will >a pianist's unseating them trash our unisons at the same time? When we = do >whole-hearted test blows, do we drive them back up ourselves? What = happens >to the bridge top and pins when we seat -- unseat -- seat, over and = over? > >Carry on, list ... all cogitations gratefully accepted. > >Susan Kline >skline@proaxis.com >P.O. Box 1651, >Philomath, OR 97370 > >Murphy's out there ... waiting ... > > Ron Nossaman
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