Mass Loading Bridges

Ric Brekne ricbrek@broadpark.no
Fri, 03 Feb 2006 21:08:57 +0100


Hi Terry

I wonder if you could give a few specific examples of use.  Like what 
would be a typical use for these in the high treble... in the low 
bass... etc.  The descriptions so far almost make it sound like you 
could approach the killer octave problem to somewhat a successfull 
degree this way.  There too you have a loud percussive and short lived 
tone development.

One other thought... I wrote a while back about an idea I had for useing 
opposing magnets in a not so very dissimiliar fashion.  Got to thinking 
that with these high power magnets one could provide both more (a 
little)  mass and extra stiffness. 

Just musing a bit tonite

Cheers
RicB



Here is a pictures of an assortment of brass-mass - all done from round
stock, bandsaw and small drill press.

Below is picture of them installed.

Terry Farrell

----------------------------------------------------------------------
----- Original Message -----
 > I'm finally getting around to working on the piano which had a boomy
 > crossover from the long bridge to the bass bridge.  I'm envisioning
 > getting some rolled brass stock and cutting off pieces for
 > this.  I've cut aluminum with a carbide blade, I think brass might be
 > a little harder.  How difficult is this to do?  I'd drill a screw
 > hole in the center and temporarily set under the bridge until I get
 > the impedance I want.
 >
 > How do you pro's do this?  Where do you source your material and what
 > is your favorite means of machining it?


Url : 
https://www.moypiano.com/ptg/pianotech.php/attachments/88/ee/09/6b/attachment.jpe

Url : 
https://www.moypiano.com/ptg/pianotech.php/attachments/de/a2/61/c1/attachment.jpe


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