Relocating Knuckles

[Joe And Penny Goss]

Hi Phil,
Actually it is two jigs, a left and a right.
Joe Goss RPT
imatunr@srvinet.com
www.mothergoosetools.com
----- Original Message ----- 
From: "Phillip Ford" <fordpiano@earthlink.net>
To: <pianotech@ptg.org>
Sent: Friday, May 21, 2004 5:28 PM
Subject: Re: Relocating Knuckles


> PF wrote:
>
> > >...So, the knuckle location had to be changed...extracting the
> >hammers and rehanging them
> > >on new shanks and flanges with a different knuckle location.
> >This was a
> > >lot more money than 2 or 3 hours of my time and a set of knuckles.
> >
> >
>
> Jon Page replied:
>
> >Why not put identical weight hammers on new shanks.
> >(Unless the shank length is not generic).
> >This way you have a prehung set for some other job.
> >
>
> Jon,
>
> 1.  Your prehung set would have to be bored at the same length as that
> of the other piano that you intend to put them on.  With a Steinway
there's
> a good chance that that wouldn't be the case.
>
> 2.  They liked the sound of the piano with the existing hammers.  There's
> more to determining the sound from a given hammer than just its weight.
In
> my opinion it would be a dicey proposition taking off a known quantity in
> the form of hammers that were producing a sound they liked, and putting on
> an unknown quantity in the form of a set of new hammers, and trying to get
> a sound from them that they liked (and not causing comparisons with the
> previous hammers - it doesn't sound like it did before, what happened?).
>
> 3.  The hammers gave a 1/2 high Strike Weight (SW), to use Stanwood
> terminology.  In my experience the action will never feel right (it will
> feel heavy or sluggish on hard or fast play) with hammers that heavy on a
> 15.5 mm knuckle location, even if you can work all the geometry out so
that
> you get a decent overall ratio, reasonable touchweight, and no excessive
> leading.  So, something would have to be done anyway.  You couldn't just
> take those prehung hammers off and put them on another piano.  You would
> either have to move the knuckle location or cut down the hammer.  Unless
> you have some sort of jig for tapering the hammers with them installed on
> the shanks (I've heard that Roger Jolly has such a jig, but I don't) then
> you would have to extract them anyway to reduce their weight.
>
> Regards,
>
> Phil Ford
>
>
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