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 > > >
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