Brambach Regulation

[Joseph Garrett]

Andrew,
On  the Kimball  type knuckle and the Brambach the jack center must be in
line with the "knuckle  line", (built into  the  shank as  one  piece  of 
wood).
On  all  others  with  the "standard" knuckle  the  back of  the  jack must
be in line  with  the back edge of  the knuckle core  wood. Two different 
animals.<G>  I  can verify  this  with  the  Kimball Service  manual ,
(circa 1940's),  that  I  have.
While  "fiddling"  with the  jack  postition,  you  have  it  backwards, 
(either that,  or I explained  it backwards).  The line of  the  vertical
wood core on a  standard  knuckle is to  the  rear  of  the piano. So  is 
the  line  of  the built in knuckle. The  difference  is  that  the built 
in  knuckle,  vertical line HAS to align with the CENTER  of the jack, 
whereas  the core of  a  standard has  to  align with  the vertical  back 
of  the  jack. Clear as  mud,  I know....but,  when you regulate one of
those pianos with the built in knuckle, it will  become apparent in the
difference.<G>

Joe Garrett, R.P.T. (Oregon)
Captain, Tool Police
Squares R I



> [Original Message]
> From: Andrew and Rebeca  Anderson <anrebe at sbcglobal.net>
> To: <joegarrett at earthlink.net>; Pianotech List <pianotech at ptg.org>
> Date: 5/7/06 10:05:08 AM
> Subject: Re: Brambach  Regulation
>
> Interesting point Joe.  I just pulled the action on one of my grands 
> to fiddle with jack position.  I was taught the one way but am 
> curious.  Turns out that on this piano both references will put the 
> jack in the same position.  I'm guessing that in some pianos there is 
> more of a difference.  Perhaps you have more to add to this.  Is 
> there a concern that lining up the back (towards back of piano) edges 
> might contribute to cheating?
>
> I was privately wondering if close let-off might shorten ideal blow 
> distance on this.  After-touch is what you feel after the jack tender 
> hits the regulation button and disengages the jack from the hammer 
> shank knuckle.  You need enough of this for the action to cycle 
> without bobbling off of the top of the jack during soft piano 
> passages (jack failing to disengage).  Generally you don't want too 
> much or too little (read, some room for taste preferences).
>
> Have fun,
> Andrew Anderson
>
> ________________________________________________________
> It frequently takes more than one ugly fact to slay a beautiful theory.
> --Chad Orzel
>
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