Capstan angle

[Ric Brekne]

Hi David, and Phil

I got to agree with Dave here.  In fact, if the key is oriented 
horizontally and the ratio equated to the key being balanced thus, then 
the key ratio is exactly the straight line from the front of the key to 
the middle of the balance rail pin to the middle of the hole of the 
capstan.  Thats the balance ratio in anycase.  The ratio of the key in 
any other position can be calculated in the same way really after one 
adjusts for the offset from horizontal. Or... one can use Torque to 
figure it out for any given angle... which is more ususal I suppose.    
In essence tho.. the key ratio is dependant at any given time on its 
angular orientation.  But if half way through the key stroke the key is 
horizontal... then its perhaps easier to just view it that way to begin 
with for simplicity.


Cheers
RicB


Sorry, but you are incorrect about the key ratio.  The key ratio depends
completely on where the capstan enters the key, nothing more nothing
less.  The ratio of the wippen lever, on the other hand, will depend on
where the top of the capstan contacts the wippen heel.   

David Love
davidlovepianos@comcast.net <mailto:davidlovepianos@comcast.net>