bore distance: was Re: hammer replacement

[David Love]

Newton:

Another issue is the starting point for the shank.  Boring to the let-off 
point positions the shank slightly higher and reduces resistance at the 
beginning of the key stroke effectively reducing the force required to get 
the key moving.  (I'm sure there's a more technical explanation)

David Love


>From: Newton Hunt <nhunt@optonline.net>
>Reply-To: pianotech@ptg.org
>To: pianotech@ptg.org
>Subject: Re: bore distance: was Re: hammer replacement
>Date: Fri, 29 Jun 2001 09:41:16 -0400
>
>Hi David,
>
>Interesting question you raise.
>
>I always calculate to string height because that is where the engineer
>determined the optimum mechanical advantage for the action.
>
>But...
>
>If you measure from bore center to strike point then add 1/8" to an
>imaginary line, that line represents the optimum regulation height for that
>hammer.  No matter whether that point is below or above the actual string
>height.  So, taking that in reverse...
>
>		Newton

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