Warped Action Parts

[Warren Fisher]

Terry,
If you level in the piano, you don't have that problem
Warren

Farrell 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

--
Warren Fisher RPT
fish@Communique.net
1422 Briarwood Dr.
Slidell, LA 70458-3102