Panel drying and finishing

[David Love]

Let me elaborate a bit more.  If you put a finish on the rib side and then
dry it down, the panel will bow slightly in the opposite direction from how
you want the crown to be formed once you bend the panel over the ribs (it
will shrink more on the bare side).  So would there be any ill effect from
bending the panel back in the other direction when you are gluing the ribs
on or anything strange about what will happen once the panel is allowed to
take on moisture again?

David Love
davidlovepianos at comcast.net 
www.davidlovepianos.com

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of David Love
Sent: Friday, October 24, 2008 5:41 PM
To: 'Pianotech List'
Subject: RE: Panel drying and finishing

Wouldn't that then create some problem in terms of the stresses in the panel
if you put a finish on one side, dry the panel down and then glue the ribs
onto a somewhat warped board?

David Love
davidlovepianos at comcast.net 
www.davidlovepianos.com

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Ron Nossaman
Sent: Friday, October 24, 2008 3:35 PM
To: Pianotech List
Subject: Re: Panel drying and finishing


> Presumably, then, if it did warp and you just left it in the hotbox longer
> it should straighten out once the moisture transfer had equalized through
> the panel?
> 
> David Love

Mostly. The cells on the surface have filled with finish, and 
there is a slight physical constraint there, so it'll be 
straight when the MC is uniformly where it was when the finish 
was applied.
Ron N