Yamaha C3 regulation

[Brad Smith]

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Hi Lance,
I had a similar experience with a 9 yr old Yamaha GH1.
I remember thinking that it felt as if the front rail felt punchings were
compacted, which made this unusually hard
landing.  Haven't seen that piano for several months, forgot about it until
yr post.

I am sure this will generate much discussion of the effects of let-off /
drop timing, etc.
Jack position in relation to knuckle core, and rep lever height, would be a
starting point.  It's easy to fake yourself out
by viewing the jack from the wrong angle.

At Yamaha performance piano training they mentioned setting your eyes "on
plane" with the back surface of the jack,
then using that vantage point, observe it's relationship to back of knuckle
core.

Also, try setting drop by feel in addition to sight.

Too much aftertouch can also create a 'cliff' which makes the bump seem more
abrupt.

Definite wall ??   Could you have some backchecks angled in to close,
catching hammers on the way up?



Brad Smith


  -----Original Message-----
  From: caut-bounces@ptg.org [mailto:caut-bounces@ptg.org]On Behalf Of
llafargue
  Sent: Tuesday, July 27, 2004 10:23 PM
  To: caut@ptg.org
  Subject: Yamaha C3 regulation


  List,

   I have a customer with a Yamaha C3 that's 4 years old.  It is like new,
very slight knuckle/hammer wear, but really good shape.  I have regulated it
and everything seems great except that the let-off bump feel seems excessive
and I can't figure out why, on this C3.  I have lubed everything, knuckles
with Teflon, McLube to all key pins, whippen/jack tops, etc, but when the
jack lets off, you really feel it.  Also, when playing pianissimo, at the
point of let-off, there is a definite wall that you hit and it actually
prevents some notes from releasing.  I am wondering what aspects of
regulation affect this.  Or is there something else I am missing?  Let-off
is about 1/8" to 1/16" graduated, drop a little more than that, checking is
close; rep springs are not too strong.  Knuckle and jack top shape seem
normal.  Thanks.



  Lance Lafargue, RPT

  LAFARGUE PIANOS

  New Orleans Chapter, PTG

  985.72P.IANO

  llafargue@charter.net



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