Compression ridges was :Do you dry the ribs, along with the board, prior to gluing ?

[Prof. Euphonious Thump]

Compression set, combined with stiffening of the wood
through aging,  would make those areas stiffer, not
less stiff, hence more inclined to augment higher
frequencies, would it not ?
    The only problem I see is that the compression set
has caused the board to lose crown, hence bearing. If
the board was designed in the first place with
inadequate restance to down bearing, well, that's
another problem entirely.
 Thump



--- Greg Newell <gnewell at ameritech.net> wrote:

> David,
> 	Said much better than I. Thank you.
> 
> Greg Newell
> Greg's Piano Forté
> www.gregspianoforte.com
> 216-226-3791 (office)
> 216-470-8634 (mobile)
> 
> -----Original Message-----
> From: pianotech-bounces at ptg.org
> [mailto:pianotech-bounces at ptg.org] On Behalf
> Of David Love
> Sent: Friday, February 01, 2008 10:31 AM
> To: 'Pianotech List'
> Subject: RE: Compression ridges was :Do you dry the
> ribs, along with the
> board, prior to gluing ?
> 
> The problem of determining the extent of damage to
> the panel goes beyond
> what is visible in the form of pressure ridges and
> may be much more
> extensive than what you can see.  The issue is
> whether the extent of the
> damage compromises the panel's ability to achieve
> the requisite stiffness to
> vibrate at certain frequencies, mostly high.  Since
> the cost of replacing
> the panel is negligible when you factor in the labor
> costs of removing the
> panel in one piece undamaged, removing the ribs (you
> would be smart to
> convert this to a rib crowned assembly), repairing
> the obvious areas of
> damage to the panel, it just doesn't make sense to
> me to not replace the
> panel--especially when you can't be sure of the
> outcome.  Unless you are
> clinging to the romantic notion of old wood being
> better, I see no reason to
> go this route and I don't see evidence of old wood
> being better.  If you are
> hoping for performance which is just adequate or
> slightly compromised, then
> it just doesn't make sense.  
> 
> 
> David Love
> davidlovepianos at comcast.net 
> www.davidlovepianos.com
> 
> 
> 
> 
> 
> 



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