Half punchings on balance rail

[Joe And Penny Goss]

Hi Bob, You may not get much bang for your buck if the D's balance rail is
radiused at the pin.
To get the most cut the felt just behind and even with the balance rail pin.
To get less cut in the middle of the hole and the least at the  front edge
of the pin.
Joe Goss RPT
Mother Goose Tools
imatunr@srvinet.com
www.mothergoosetools.com
----- Original Message ----- 
From: "Bob Hull" <hullfam5@yahoo.com>
To: <pianotech@ptg.org>
Sent: Monday, September 06, 2004 1:21 PM
Subject: Half punchings on balance rail


> List,
>
> I have searched the archives for comments on the
> practice of cutting a felt balance rail punching in
> half and glueing it to the bottom of the key (behind
> the balance rail pin) in an effort to change lower
> downweight and/or strike weight ratio.
>
> My search didn't yeild any previous discussions.  I
> have tried this method (experimentally on the bench)
> which did lower the downweight too much, and lowered
> the strike weight ratio from 5.78 to 5.31.  I'm
> wanting a 5.5 ratio. The piano is a D on which I have
> just replaced the hammers. They are a little on the
> light side, I think, for a D. (#1 sw is 12.1, #40 is
> 9.7.)  It is in a small recital hall which doesn't
> require huge tonal projection.
>
> What do you think about this practice?  On another
> note I tried just cutting off 1/4 of the front part
> and it gave more desirable results.
>
> Comments?  Thank you for all the great help you
> usually give.
>
> P.S.  As you can tell, I'm trying to get a grasp on
> using the smartchart.
>
>
> Bob Hull
>
> __________________________________________________
> Do You Yahoo!?
> Tired of spam?  Yahoo! Mail has the best spam protection around
> http://mail.yahoo.com
> _______________________________________________
> pianotech list info: https://www.moypiano.com/resources/#archives
> ----------------------------------------------------
> This message has been processed by Firetrust Benign.