[pianotech] Pitch change, etc.

[David Ilvedson]

FWIW...In "Under the Lid", in the stability chapter, Steve Brady thought the unfinished bridge cap would react to humidity changes more quickly than the finished soundboard but would  have a much smaller effect on pitch...

David Ilvedson, RPT
Pacifica, CA  94044

----- Original message ----------------------------------------
From: "William Truitt" <surfdog at metrocast.net>
To: pianotech at ptg.org
Received: 4/6/2010 2:50:28 PM
Subject: Re: [pianotech] Pitch change, etc.


>I find the idea of the epoxy laminated caps very interesting, in part
>because of the difficulty in consistently getting good hard rock maple
>bridge stock.  I can't speak to the tuning stability, but it would seem
>likely that the epoxy saturation would form a vapor barrier throughout the
>wood, thereby negating the effects of humidity on the cap and any movement
>of the wood associated with that.

>I had wanted to roll my own epoxy laminated bridge caps for my last rebuild,
>but was unable to find a supplier for the veneers required to make up the
>pieces.  I did chase one idiot supplier for 6 weeks, but could not get him
>to send me the veneers before I gave up on him.

>Any recommendations for a supplier, anyone?  I'm starting a B in a month or
>so that will get a new board and caps.

>Will Truitt



>-----Original Message-----
>From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
>Of Ron Nossaman
>Sent: Tuesday, April 06, 2010 1:59 PM
>To: pianotech at ptg.org
>Subject: Re: [pianotech] Pitch change, etc.

>David Ilvedson wrote:
>> "For instance, I've noticed, and it's been mentioned 
>> by others, that my RC&S rebuilds with epoxy laminated bridge 
>> caps stay in tune better than everything around them."
>> 
>> How many pianos do you have out there, Ron?   Sounds a wee bit
>unsubstantiated...to me.

>I don't know, a dozen or so of these. It's what I see in the 
>pianos I tune locally, and what techs I've done pianos for 
>tell me elsewhere. It's an observation I find interesting, not 
>something I'm ramming down your throat.
>Ron N