[pianotech] Soundboard deflection - Pitch raise

[David Love]

Are you suggesting that soundboard deflection is the cause for the
predictable 25% - 30% loss in the initial pitch correction even when that
net change is similar whether pianos have no crown and no bearing or quite a
bit of crown and ample bearing?

 

David Love

www.davidlovepianos.com

 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of PAULREVENKOJONES at aol.com
Sent: Tuesday, August 04, 2009 2:46 PM
To: pianotech at ptg.org
Subject: Re: [pianotech] Soundboard deflection - Pitch raise

 

And unproved. David, where's the data?

 

P

 

In a message dated 8/4/2009 11:45:27 A.M. Central Daylight Time,
AlliedPianoCraft at hotmail.com writes:

Interesting.

 

Al G

 

 

From: David Love <mailto:davidlovepianos at comcast.net>  

Sent: Tuesday, August 04, 2009 10:05 AM

To: pianotech at ptg.org 

Subject: Re: [pianotech] Soundboard deflection - Pitch raise

 

Not board deflection but plate contraction is the culprit.  

 

David Love

www.davidlovepianos.com <http://www.davidlovepianos.com/> 

 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Al Guecia/AlliedPianoCraft
Sent: Tuesday, August 04, 2009 4:19 AM
To: Pianotech List
Subject: [pianotech] Soundboard deflection - Pitch raise

 

I did 2 pitch raises yesterday (new customers). One was at A-418 and the
other was A-420 before I started. What I found interesting was the amount of
board deflection. On one of the pianos (A-418), the first 3 notes (A-0, A#-0
& B-0, were dead on, (go figure) on my first pass. I raised the pitch to
440, (some notes on this piano were 190 cents flat, wow!). On my second pass
the first 3 notes were about 10 cents flat. I was surprised that the board
deflected that much. No question here, just an observation I thought I'd
pass on.

 

Al G

 

 

 

  _____  

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://ptg.org/pipermail/pianotech.php/attachments/20090804/d1a1754a/attachment-0001.htm>