wraped keybed

[Wimblees@AOL.COM]

In a message dated Tue, 27 Aug 2002 17:42:38 +0200, collin.s@skynet.be writes:

> Hello list.
> 
> Is there a way to cure a wraped keybed in a grand piano ?  There is about 1 cm gap between the front of the action and 
> the keybed.  Should I add some material under the action frame?
> Thanks for any idea.
> 
> Stéphane Collin.

Stephane

First of all, I think you mean warped, not wraped, keybed. (see misspelling). 

A 1 cm gap between the action and the keybed is not an indication that the keybed is warped. It probably means the glide bolts are too high in the middle. To solve this problem, start by raising all the glide bolts so that they do not contact the keybed. (If you want, you can remove the action, and see that the glide bolts are even or below the edge of the keyframe). Then, with the action in the piano, press down on the balance rail at one of the glide bolts. You will probably see the front of the keys dip down slightly. (The easiest way to do this is to fulcrum your hand between the action and the pin block.). You don't want this to happen. So lower the glide bolt until the keys do not move any more. The next step is to hit the keys the side of your hand at the balance rail with. Move the glide bolt either up or down, until you hear a knocking sound. This indicates the glide bolt is just above the keybed. You want to turn the glide bolt down just a few degrees more, so that you won't hear the knocking sound. That glide bolt is now int he correct posistion.

You have to do this to all the glide bolts. Start this procedure with the glide bolt in the upper treble, (not the last one on the right). Then do the next one to the left of that one. When you have that one right, go back and check the one you did first. Repeat this until all of the glide bolts are in the right place. (the last one you will do is the one on the far right). 

This will most likely solve your problem.

Good luck

Wim