jacks Does and naugahyde?

[Isaac Sadigursky]

Hi,Sarah! maybe,i was to tired last night and forgot to mentioned:once
whippen is out,check whippen flange center pin and tip of the jack for any
burrs of sharp edge {it needs to be slightly      rounded},also leather
roughness onn the hammer butt is critical..ghood luck! isaac


> [Original Message]
> From: Don <pianotuna@yahoo.com>
> To: PTG <pianotech@ptg.org>
> Date: 11/23/04 7:37:15 PM
> Subject: jacks Does and naugahyde?
>
> Hi Sarah,
>
> Baldwin Hamiltons from that era (at least the ones I
> have seen) place positive pressure on the whippen.
> This means the jack spring has to be much
> stronger--but it also means there is never lost
> motion. A poor trade off imho, as when the instrument
> ages repetition gets flakey.
>
> The butt "leather" was Doe skin--then a modern mirical
> material called "corfam" which unfortunately got hard
> and clicked. Today many makers use "escane" which
> seems to have all the good features of doe
> skin--without killing bambies.
>
> Most people would focus on the jack flange reacting to
> humidity change causing poor repetition...but I think
> the wippen flange may be the culprit.
>
> >... which was once exactly the problem with my little
> >Hamilton.  It was aggrivated by higher humidity.  As
> I >recall, the Hamiton butt leather isn't really
> leather >but is some synthetic stuph.  Perhaps it
> expands >somewhat with humidity???  Anyway, the cure
> was to add >a wink more lost motion, at least on *my*
> piano.
>
>
>
> =====
> Regards,
> Don Rose, B.Mus., A.M.U.S., A.MUS., R.P.T.
> 3004 Grant Rd, Regina, SK, S4S 5G7
> Tuner for the Saskatchewan Centre of the Arts
>
> http://us.geocities.com/drpt1948/
>
>
> 		
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