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AH !!<br>
<br>
Yes... well this clears up things quite a bit. One runs into a
similiar situation often enough with the hammers just plain regulated
too high often enough. Just recently ran into a case of this on one of
Bergens more important instruments. Oddly enough... the fellow who did
the regulation was attempting to deal with repetition problems.... go
figure. Hammers were regulated in this case to 36 mm !!! from the
strings.<br>
<br>
I have not thought of this has being related to relative positions of
the balancier and hammershank centers tho. And I am still a bit foggy
on how these can contribute to this condition. An explanation would be
greatly appreciated. On the surface of it... it would seem that as
long as you regulate with in reasonable correspondence to specs... all
should work reasonably well.<br>
<br>
Cheers and thanks<br>
RicB<br>
<blockquote><br>
Greetings, <br>
<br>
I wrote: <br>
>>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. >><br>
<br>
<br>
<blockquote>RicB writes: <br>
<< 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? << <br>
</blockquote>
<br>
Yes, When the hammershank is too far above its rebound cushion,
<br>
(often miscalled the "rest cushion"), there exists the possiblitity
that under <br>
fast repetition, the hammer will rebound all the way down to the
cushion while <br>
the jack is escaped. In this event, the key cannot return high enough
to allow <br>
the jack to reset and the note will not play until the key has been
struck <br>
several times and the balancier lifts the jack aaaallllll the way back
up so that <br>
the key can reset. The basic problem is that the knuckle can be so low
in <br>
the coincidental arcs formed by the hammershank and whippen, (as
measured at the <br>
knuckle/ repetition interface), that jack can't get underneath it from
this <br>
low a position. <br>
If there is a tremendous spring strength, this effect can be
minimized, <br>
but then you have a very definite resistance to escapement, ruining the
<br>
sensitivity of pianissimo playing. <br>
Hope this helps, <br>
<br>
</blockquote>
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