[pianotech] Pressure ridges

[A440A at aol.com]

Mike writes:

<< No experience here, but it seems logical to repair a pressure ridge the 

same way one would repair a crack.  Cut away the damaged wood and fill 

with either a spruce shim or thickened epoxy.  Like crack repair, this 

would be mostly cosmetic, although you might expect this action to 

prevent the rib separation that sometimes follows cracking. >>

        I think cutting up a soundboard because a pressure ridge is evident 
is asking for trouble.  If there is no rib separation, there is no problem.  
The separation and cracking tend to go together, but that is usually associated 
with hide glue, which fractures easily once the crack begins.  I don't 
remember a Yamaha that had ribs coming loose in normal usage.  
   Sometimes it is better to let the instruments age with their cosmetic 
blemishes rather than attempt major surgery. 
Regards, 



Ed Foote RPT 
http://www.uk-piano.org/edfoote/index.html
www.uk-piano.org/edfoote/well_tempered_piano.html
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