[CAUT] caut Digest, Vol 1103, Issue 85 Moving Wippen Rail

[Byeway222 at aol.com]

Rick Brekne's logical statement regarding the definitive action  spread 
measurement for a piano makes a lot of sense:-
 
I understand the thinking, but would point out that the  whippen center 
hammer center spread is really quite predetermined by the  position of 
the jack at rest when the action is a the desired regs specs. It  should 
be very perpendicular to the shank with the back side of the jack  
running an extension of the line of the back side of the knuckle core.   
Not a lot of room for moving this around unless you want to introduce  
friction problems.

Is it naive then, given this correct whippen position, to trace back  the 
action /key geometry from this point and say that the definitive  position of the 
capstan in the key is therefore exactly in the middle of  the lever heel ?  
And also, then calculate the correct key balance  position from these two 
crucial points on the magic line?
 
ric



   
-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://www.moypiano.com/ptg/caut.php/attachments/20071029/60a2d60c/attachment.html