What washer? ( I'll put one on). Thanks, I hadn't tightened them at all. It appeared to me that to much tension in the middle of the post would eventually cause it to warp. I hadn't thought of tightening up the nut so much it would snap the plate. Nose bolt. I'll archive search for it. I detuned the strings necessary to tighten the ones along the perimeter of the pinblock. They were all into good wood, not a stripped one in the bunch. Keith R. ----- Original Message ----- From: "Kevin E. Ramsey" <ramsey@extremezone.com> To: <pianotech@ptg.org> Sent: Sunday, January 06, 2002 6:19 PM Subject: Re: Upright plate bolts > Keith, since I seem to be the first to respond to this, let me be the > first to give you this warning: > > "Confucius say, "He who over-tightens nose bolts, is asking for > trouble.' " > > If I read your post correctly, those are indeed nose bolts. They are > designed to prevent the plate from deviating too far from their design > parameters. They should not be loose, but they definitely should not be > cranked down. To do so could cause failure of the plate. And as my brother > the auto tech would say, it's good for the life of the instrument, once it > goes, that's it for the life of the instrument. ( Substitute auto for > instrument, in his case.) > So, don't go cranking those thingees down, just make sure they're not so > loose that the washer can be moved with your hand. > You'll probably hear from more expert people on this list, I just wanted > to get this warning out to you as soon as I could. Just snug 'em a little, > but don't crank down on 'em. > By the way, how did you get to the screws behind the strings? Got the > strings off? > > > ----- Original Message ----- > From: "Keith Roberts" <kpiano@goldrush.com> > To: <pianotech@ptg.org> > Sent: Sunday, January 06, 2002 4:43 PM > Subject: Upright plate bolts > > > > I have a 1911 A. B. Cameron upright, (given to me). As part of my > continuing > > education I am doing various projects that I get to see the immediate and > > long term effects of each project. I tightened up the plate bolts and > > screws, (the ones behind the strings were the loosest), and what a > > difference in the sound. The tubby sound all but dissapeared. However, > there > > is a stud that comes out of one of the back posts, through the sound board > > (not attached to), through the plate with a large square nut on it and no > > back up nut under the plate. This is located below the hitch pins for D5. > > There is also a screw that does the same thing on the post to the right > and > > is below the hitch pins of note B6. It appears to me that this might > affect > > the downbearing on the bridge and the tension of the soundboard. What is > the > > purpose of these, and how do I adjust them? Should I rely on my mechanics > > wrist and elbow function that tells me when it's tightened to the max > torque > > just before failure? Thank You in advance. > > > > Keith Roberts > > Associate PTG > >
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