[CAUT] Steinway repetition center pin height

[A440A at aol.com]

 Greetings, 

  I wrote: 
>>I think he is referring to capsizing the action, where the hammer

    shank is so far below its rest position that the jack cannot return under 
the

    knuckle. >>
 

RicB writes: 
<<  I dont think I've ever run into this situation. And I 

am trying to picture how it could come about. Anyone care on expounding 

on this a bit more? << 

       Yes,  When the hammershank is too far above its rebound cushion, 
(often miscalled the "rest cushion"),  there exists the possiblitity that under 
fast repetition, the hammer will rebound all the way down to the cushion while 
the jack is escaped.  In this event, the key cannot return high enough to allow 
the jack to reset and the note will not play until the key has been struck 
several times and the balancier lifts the jack aaaallllll the way back up so that 
the key can reset.  The basic problem is that the knuckle can be so low in 
the coincidental arcs formed by the hammershank and whippen, (as measured at the 
knuckle/ repetition interface), that jack can't get underneath it from this 
low a position.    
      If there is a tremendous spring strength, this effect can be minimized, 
but then you have a very definite resistance to escapement, ruining the 
sensitivity of pianissimo playing.  
Hope this helps, 

 
Ed Foote RPT<BR><BR><BR>**************************************<BR> See what's 
free at http://www.aol.com.</HTML>