S & S 'A' parts, geometry -- shanks and flanges

[Richard Moody]

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> From: Newton Hunt <nhunt@jagat.com>
> To: pianotech@ptg.org
> Subject: Re: S & S 'A' parts, geometry -- shanks and flanges
> Date: Tuesday, October 06, 1998 7:39 AM
> 
> I've taken readings from .357 to .395 in the same set!!!  Does it not
> also effect the relationship from whippen centerpin to hammer flange
> centerpin?...Where's that knuckle supposed to be at rest?
> 
> Good question, Dave.  If I remember my theory right, the knuckle lies
> along a straight line from hammer to wippen centerpins at the beginning
> of let-off.
> 
> Go check an action and let me know.
Newton

May I suggest if he checks the action out with the knuckle variation
between .357 and .394, and THEN IF they all lie on that "legendary line
between hammer center to wippen centers" a  some might already be at the
strings before let off.  
	My reasoning is this, the line never changes during an action event. The
jack reaches  let off regardless of how big the knuckle is, until the
capstan is adjusted. If so,  knuckles of different size  will not all lie
on that line at let-off 

Ric Zig Zag