[pianotech] treating bridges with CA

[Porritt, David]

Ric:

Aren't Cincinatti Conservatory/Wapin patents valid in Norway?

dp


David M. Porritt, RPT
dporritt at smu.edu


-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Richard Brekne
Sent: Tuesday, December 01, 2009 4:10 PM
To: pianotech at ptg.org
Subject: Re: [pianotech] treating bridges with CA

    Has anyone ever tried to design a bridge made our of metal?  I know
    it would sound different but at least it wouldn't crack.

    Scotty

I dont really think that would be necessary.  Most bridges hold up by 
and large really well... its the thing about string grooves that all to 
often get exasperated by over enthusiastic string seating procedures 
which also do bridge pins anything but good often as not that is the 
real problem.

One thing I've been trying out is a variation on the three bridge pin 
thing Wapin does along with three center pins cut to size that sit just 
aft  (forward of the back set of course) of each set of bridge pins 
under the strings. Keeps the string off the wood itself. The front 
bridge pin is vertical, the middle pin just 3 mm aft and slanted as is 
usual for the front pin and then the usual back pin. Seems to work just 
dandy. Totally erases any problems that can arise due to string grooves.

Cheers
RicB