Crown in Key Bed

[Wimblees@AOL.COM]

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In a message dated 2/18/01 8:00:39 PM !!!First Boot!!!, gnewell@ameritech.net 
writes:


> I am presently working on a Kranich and Bach that appears to have a
> >one-eitghth inch crown in the key bed.  (Using a straight edge held down
> >at the back of the key bed, it is 1/4 inch off the keybed at the front.)
> >
> >Is this the way the piano was designed or is this damage of some kind?
> >
> >The key frame is VERY flexible in that when it is removed, the front rail
> >can easily wave in the breeze.
> >
> >Larry Messerly, RPT
> >Prescott, AZ
> 

I am not sure of the crown in the keybed, but I do know that a K&B key frame 
is very flexible. Why I don't know. I always assumed it was a poorly designed 
key frame. But perhaps it is made that way on purpose. When leveling keys, 
don't we want a 1/16" crown in the middle? Perhaps what K&B did was put that 
crown in the keybed, and made the frame flexible to allow it to conform to 
the bed, without putting tension on the frame.

Willem 

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