[pianotech] balance hole jig

[Dean May]

Dean

Dean W May                (812) 235-5272 voice and text 

PianoRebuilders.com    (888) DEAN-MAY        

Terre Haute IN 47802

  _____  

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Ed Foote
Sent: Thursday, July 26, 2012 10:25 PM
To: pianotech at ptg.org
Subject: Re: [pianotech] balance hole jig

 

 

-----Original Message-----
From: jim <jim at grandpianosolutions.com>




>> I've only dealt 
with the half round dowels once so far. Seems like a good idea.  On a 
short key stick, as opposed to the long D sticks I think you're talking 
about, what are the down sides of the half dowel?  Do they jump around, 
click? Do they create an unstable key height in any way, or are they as 
good an idea as they seem? (there's mostly always engineering tradoffs)
 
 
Greetings, 
   It seems I was told, at the factory, back in the late 1970's, that the
original idea with the accelerated action was that the hole was a little
offside, so that the point of fulcrum would move proximally as the key was
depressed.  Much like the cut punchings.   This would accelerate the action
ratio throughout the keystroke, giving you maximum leverage at the
beginning, progressing to maximum velocity at the very end. 'From low gear
to high gear in .390".     At least, in theory.  I have never been around an
artist that could tell the difference, and the biggest effect to me is, as
Ron said, it makes key work more difficult.  
     I would opt for a a stiffer key with sole and top plates instead of the
thinner ones sitting atop the half-rounds. 
Ed Foote RPT


http://www.piano-tuners.org/edfoote/well_tempered_piano.html
 

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