Increasing Crown

[David Ilvedson]

Remember in the "good old days" when we used to wedge up the soundboard from below along the bridge.   Then cover the piano with blankets, stick in some shop lights and let bake for a few days.   Then we'd shim all the cracks, let dry then remove the wedges and supposedly we would have some more crown.    The theory being the wedges did push the soundboard up and the shims would help hold it there...this was some 30 years ago when I was apprenticing...

David Ilvedson




----- Original message ----------------------------------------
From: Terry <terry@farrellpiano.com>
To: Pianotech <pianotech@ptg.org>
Received: Mon, 14 Mar 2005 11:08:25 -0500
Subject: Re: Increasing Crown


>I didn't answer because I didn't know quite how to respond without sounding
>sarcastic.

>Sooooo, not meaning to sound sarcastic.........

>Yes, I suppose if you wedge up a flat board and glue on some auxillary
>laminations, you might be able to get the structure to retain a bit of
>crown - but will that do any good? You are increasing the mass of the ribs.
>What effect will that have? How much crown do you want? Will it get you
>enough crown?

>I guess I just don't have any real interest in haphazardly applying
>band-aids to a soundboard that is shot.

>Terry Farrell

>> I am currently fiddling with the idea of gluing
>> auxilliary laminations to the spine of existing ribs,
>> while the two are flexed together, along with a
>> backing caul, by a jig secured to the back of the
>> piano.
>>      I asked Terry Farrel to recommend a
>> laminate--perhaps 3mm thick, 3 ply, but have not heard
>> back from him yet. Anyone else care to comment?
>>      Thump


>_______________________________________________
>pianotech list info: https://www.moypiano.com/resources/#archives