Diagnose This! (A puzzler)

[Alan]

You are right. But hold all calls, please, we already have a winner!

(Considering the prize, you don't know how lucky you are to be number
two.)

Alan R. Barnard
Salem, MO


-----Original Message-----
From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On
Behalf Of Jerry Cohen
Sent: Wednesday, July 16, 2003 4:30 AM
To: Pianotech
Subject: RE: Diagnose This! (A puzzler)


The jack spring was too long or mispositioned,
preventing the jack from fully returning, despite the regulating button.

Jerry Cohen
New Jersey

--- Alan <tune4u@earthlink.net> wrote:
> Yes, but how? Turning the regulating screw
> accomplished nothing.
> 
> Alan R. Barnard
> Salem, MO
> 
> 
> -----Original Message-----
> From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On
> Behalf Of Avery Todd
> Sent: Tuesday, July 15, 2003 8:38 PM
> To: Pianotech
> Subject: Re: Diagnose This! (A puzzler)
> 
> 
> Correct the position of the jack under the
> knuckle????
> 
> Avery
> 
> At 08:32 PM 07/15/03 -0500, you wrote:
> 
> >Piano: Late model Geo. Steck small grand.
> >
> >
> >
> >The Problem: G#3 failing to play on a hard blow.
> >
> >
> >
> >Observations: Plays with perfect reliability on
> soft blows but misses
> >almost every time on hard blows (jumps up a little
> but no where near
> the
> >string).
> >
> >
> >
> >Possible causes eliminated:
> >
> >
> >
> >1.       Key stick is NOT cracked or broken
> >
> >2.       “Catcher Interference” ruled out by the
> umpire—hammer tail is
> NOT
> >snaggin’ or draggin’ on the buckskin.
> >
> >3.       Hammer, shank, and knuckle are fine.
> Observed, from marks on
> the
> >knuckle, that it was only resting on one side of
> the rep lever. Hammer
> >not
> >centered well on strings either. Adjusted the
> lateral position of both
> >hammer and rep lever to better align everything.
> Had no effect on the
> >problem. (Before you squawk, the piano is pretty
> new; the hammers
> >virtually grooveless*.)
> >
> >4.       Examined whippen assy. No problem with
> flanges or centers. No
> >cracked or broken parts. Nothing missing. Nothing
> unhooked or out of
> >its
> >slot, etc. All in like new condition.
> >
> >
> >
> >Clues:
> >
> >
> >    * Let off was early (maybe 3/8”) and turning
> the adjusting dowel
> > didn’t seem to change the letoff point. Hmmm …
> >    * Jack height was good but jack was too far
> forward. Aha! Jack
> isn’t
> > getting fully under the knuckle and is tripping
> out so fast on a hard
> > blow that there is nothing to lift the hammer!
> Yes, yes!
> >    * Turned the jack regulating screw … jack did
> not move any further
> > back. I could push it back, but it just came
> forward again when
> released.
> >    * The wippen spoon was bent a little, more
> angled than on
> neighboring
> > whippens … almost as though someone (factory?) was
> trying to get that
> > jack into position. Straightened the spoon. No
> help. Turned the
> > regulating screw until the felt and dowel were no
> longer even touching
> 
> > the spoon. Jack stayed right where it was.
> >
> >
> >Hint: I had to remove the jack to fix the trouble
> but there was no
> >problem, whatsoever, with the jack. In reinstalling
> the jack, I used a
> >certain tool that I already had at hand … (what a
> giveaway!)
> >
> >
> >
> >Puzzler: If I said any more, it wouldn’t be a
> puzzler now would it?
> >What
> >simple thing was necessary to restore this key to
> full power and proper
> 
> >regulation?
> >
> >
> >
> >Prize: One of my regular clients. (Note: I get to
> pick which one, and I
> >have someone specific in mind.)
> >
> >
> >
> >(To Joe Garrett: Thanks, Joe. And feel free to
> submit an entry.)
> >
> >
> >
> >Alan R. Barnard
> >
> >Salem, MO
> >
> >
> >
> >*Grooveless? Like, wow, Man, that is so un-glad. I
> am, like, totally
> >bummed for you. I really feel for that felt. Have a
> flower.
> >
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> 
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> 
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Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.495 / Virus Database: 294 - Release Date: 6/30/2003