Phil, I don't understand. >>I am continuing to investigate action screw torque. One thing that has >>turned up on some correspondence is the admonition not to crush the >>flange. Any thoughts on why this is a bad idea, other than aesthetics? Why would you "want" to crush the flange and cause damage? If one does, sooner or later, it's going to cause a problem. JMHO. Avery >>Would the flange have a tendency to get loose sooner as a result of some >>crushing? Is the magic circle of sound detrimentally affected by flange >>crushing? >> >>Phil Ford > > I had a case where, after tightening action screws, one of the hammers > became sluggish in returning. I loosened the screw a quarter or half > turn, and it freed itself up again. Tried tightening the screw again and > it became sluggish. All I can figure is that the pressure of the screw > was distorting the flange just enough to cause the "ears" (that the pin > goes through) to not be quite parallel -- like a bent axle from too heavy > a load. > But the other reason not to overdo it, especially during dry weather, > is that when it gets humid, the part will swell and crush wood > fibers. Then the next time they shrink, and action screws are tightened, > they might split or be damaged further. > --David Nereson, RPT > > >_______________________________________________ >pianotech list info: https://www.moypiano.com/resources/#archives
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