[pianotech] balance hole jig

[Ed Foote]

-----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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