Warped Action Parts

[Farrell]

Thank you Roger. Perhaps I should do that. I have heard of that before, and
I have the back rail snugged down with spring clips, but it would always be
good to get that curve out of there once and for all. Sounds like a plan.
Thanks for sticking this bug in my ear. Have fun in Reno. Send Derek to
Chicago in 2002! (And yourself, of course.)

Terry Farrell

----- Original Message -----
From: "jolly roger" <baldyam@sk.sympatico.ca>
To: <pianotech@ptg.org>
Sent: Wednesday, June 27, 2001 8:49 PM
Subject: Re: Warped Action Parts


> Hi Terry,
>              First you need to saw kerf the frame top and bottom,  about
> half way through the frame. Alternately about 6" apart. Glue veneer into
> the saw kerfs on the side that will effect the bending in the right
> direction.  Leave the other side kerfs open to allow for expansion. Once
> straight and fitted to the bed. Mount the stack, end brackets only
secured,
> you can now shim the feet of the other brackets.  Quite often just a few
> kerfs at the top of the bow will do the trick, the weight of the keys will
> help straighten things out.
> You need to have the glide bolts jacked up and clear of the bed, to bed
the
> front and rear rails. Once you have these two rails very close.  Go ahead
> and start bedding in the normal manner.
> Hope this helps.
> Roger
>
>
>
>
>
> At 05:21 PM 6/26/01 -0400, you wrote:
> >Does anyone have any good tried-and-true methods (or any good guesses)
for
> >aligning/leveling a keybed, keyframe and stack? I'm trying to do a
> >regulation on the Knabe I replaced the keybed in. Keybed is dead flat. I
> >have put excellent straight-edges every which way on it and it is very,
very
> >flat. My trouble arose when I leveled the keys on a very flat bench with
the
> >action clamped down (back action frame rail bows up). Put stack on after
> >leveling, put in piano, and keys were way low in middle. Turns out not
only
> >is the keyframe warped up, but the hammer and wippen rails are warped
> >upwards in the middle also. So when you attach the stack to the keyframe,
it
> >pulls up the middle of the keyframe even more.
> >
> >We are talking about a good (well, depending on how you look at it) 0.060
> >inch gap between a flattened back action frame rail and the center action
> >frame foot (front and rear) - lesser on others and zero at ends.
Obviously I
> >can just shim under the feet, but even here I get some conflicting
> >measurement results. I have even stood everything on end when measuring
> >warpage to eliminate the straightening effect of gravity, but then when I
> >lay it out on the flat bench, I get different measurments - not just a
bit
> >less or more, but rather the lowest foot is now the highest foot.
> >
> >Is there any hope here. I know very well what the heck the piano needs: a
> >new piano, or at least a new action frame, keys, and top action (would at
> >least solve this problem). But the plumber/electrician that is in full
> >charge of the fate of this hospital-owned piano does not feel it real
wise
> >to spend much money on it. I'm just trying to get the %&*# termite-eaten
> >thing to play!
> >
> >Thanks for any input. Anyone got a shoulder to cry on?
> >
> >Terry Farrell
> >
>