Warped keyframe

[Jon Ralinovsky]

Hi Roger,
Would this method also work on a Yamaha back rail?  I have a similar 
problem on a C3 - the ends are well-bedded, but the area in the 
middle is rather uncooperative.  There aren't any kerfs, save the 
cut-out for the una corda lever.

Respectfully,
Jon



>Hi Victor,
>                  A healthy saw kerf half way through the rail, at 
>the top of the crown, of the warp.Two kerfs, from the underside 
>about 6" on either side of the crown kerf.  Shim the lower kerfs to 
>straighten the frame.  Then bed the frame in the traditional manner.
>Warped frames have a nasty way of moving with humidity changes, the 
>high side saw kerks, helps to stop any warping upward movement if 
>they are left open.
>Regards Roger
>
>
>At 07:41 AM 2/11/02 -0500, you wrote:
>  >Heelo all,
>  >
>  >I need your help in deciding what to do with a Howard #550 (Kawai) Ser#
>  >2905365.
>  >They key frame is warped upwards at the center of the front rail. I am not
>  >sure if the balance area or the back part of the4 frame is also warped. Did
>  >not get the chance to look at it; and could not really figure out how to do
>  >it in a small apartment.
>  >
>  >What is the best remedy.
>  >
>  >Thanks
>  >
>  >Regards.
>  >
>  >Victor Belanger
>  >Somerville, MA
>  >

Jon Ralinovsky
Piano Technician
Department of Music
Miami University
513/529-6548