[CAUT] Downbearing Error

Willem Blees wimblees at aol.com
Mon Nov 19 12:02:02 MST 2007


What caused the downbearing to be much to begin with?


Willem (Wim) Blees, RPT
Piano Tuner/Technician
Honolulu, HI
Author of 
The Business of Piano Tuning
available from Potter Press
www.pianotuning.com


-----Original Message-----
From: Richard Brekne <ricb at pianostemmer.no>
To: pianotech at ptg.org; caut at ptg.org
Sent: Mon, 19 Nov 2007 8:08 am
Subject: [CAUT] Downbearing Error


Hi folks?
?
Looking for advice as to how to go about correcting a downbearing error. There is too much downbearing. The thought is to remove bridge pins ... say five unisons at a time.... shave down the bridge top string up again. This will necessitate plugging bridge pin holes and redrilling as I need to come down probably 2-3 mm in places. ?
The high spot of string deflection is the leading edge of the bridge. My question is whether its best to leave the back edge at the height it is and angle the bridge surface down more towards the leading edge... or should I remove equally across the entire surface of the bridge ?... or is there another way of going about this.?
?
I cant change anything about the plate height in this instance. I have to accomplish this by altering the bridge. Back lengths are too long to raise them enough by half rounds... and that would look wrong here anyways.?
?
Thanks for any input.?
?
Cheers?
RicB?
?


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