[CAUT] Steinway repetition center pin height

[Chris Solliday]

I don't think I could have said it better myself.
Chris Solliday
----- Original Message ----- 
From: <A440A at aol.com>
To: <caut at ptg.org>
Sent: Friday, June 15, 2007 10:38 PM
Subject: Re: [CAUT] Steinway repetition center pin height


> 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>
>
>