Upright plate bolts

[Keith Roberts]

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
>
>