Sanding Bridge Tops

[David Love]

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If you have bridge roll, or more accurately, soundboard collapse, is
releveling the top of the bridge going to solve the problem?  It seems
like you would just be adding pressure to an already weakened part of
the panel.  Then it's time for a new soundboard, it would seem. 
 
David Love
davidlovepianos@comcast.net 
-----Original Message-----
From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On
Behalf Of Joe Garrett
Sent: Monday, May 16, 2005 9:55 AM
To: pianotech
Subject: Re: Sanding Bridge Tops
 
David Love said: "No, I just use the string grooves themselves as the
guide.  Sand until
they just disappear.  Recheck the bearing and make adjustments to the
plate if necessary. "
 
That's all well/good, however, it assumes that the bridge hasn't
"rolled" and also that the bridge was made correctly in the first place.
If you ascertain that the bridge hasn't rolled then a quick check with a
small Square will tell you if you are on track. If the bridge has rolled
then you need to compensate. in that case, set up with a "T-Square" will
give you the correct angle.
Regards,
Joe Garrett, R.P.T.
Captain, Tool Police
Squares R I

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