rolled bridge -'continued'

Farrell mfarrel2@tampabay.rr.com
Sun, 29 Sep 2002 08:43:56 -0400


Good grief. I gotta straighten out those clowns in Quality Control!   Correction:

"What is the bridge shape like all along and to the front and rear of long bridge?"

Should read:

"What is the soundboard shape like all along and to the front and rear of long bridge?"

Sorry folks.

Terry Farrell
  
----- Original Message ----- 
From: "Farrell" <mfarrel2@tampabay.rr.com>
To: <wayne.hohle@sympatico.ca>; "Pianotech" <pianotech@ptg.org>
Sent: Sunday, September 29, 2002 8:38 AM
Subject: Re: rolled bridge -'continued'


> Often, when a crack develops in a soundboard (I think especially when the crack has existed many years) the edges will separate and curl up from the ribs. This does not necessarily have any effect on bridge orientation.
> 
> The task still remains:
> Describe the shape of the soundboard and describe the orientation of the strings in relation to the bridge top (describe downbearing in detail). These are required to answer your question with authority.. What are the downbearing angles - speaking length, bridge top, and backscale? Take at least six detailed sets of measurements along the long bridge. Do you have a Lowel Downbearing Gauge? What is the bridge shape like all along and to the front and rear of long bridge? Characterize soundboard profile between each set of ribs with a taught string, and examine the profile on either side of the bridge - one side can have some positive crown while the other side has negative crown.
> 
> You may never know exactly what caused the damage (excessive swings in humidity? poor design? poor manufacturing techniques? substandard materials?), but with the resultant data you can characterize what the damage is. From there you can come up with a recommendation for what does the customer do.
> 
> Terry Farrell
>   
> ----- Original Message ----- 
> From: "Wayne Hohle" <wayne.hohle@sympatico.ca>
> To: <wayne.hohle@sympatico.ca>; "Pianotech" <pianotech@ptg.org>
> Sent: Sunday, September 29, 2002 8:11 AM
> Subject: Re: rolled bridge -'continued'
> 
> 
> > Wayne Hohle wrote:
> > 
> > > hi there
> > > the other day i looked at a cutomers piano, a grand about 5'6'', that had a long crack on the hitchpin side of the bridge, the tenor treble bidge,. the sound board was also ridged there so this must be a rolled bridge. the tone quality was also very weak. what caused a bridge to roll in the first place, and what is  the repair solution
> 
> >     some asked if i could discribe the crack. looking from the bottom of the  piano at the sound board the crack curves upward  noticeably with the high side of the crack on the bridge side of the separation. if you look at the sound board from the top and standing at the keys i get the impression that the sound board dips down or has
> > minimal crown. any feed back on the same question- what caused the damage and what does the customer do
> 
> _______________________________________________
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