[Files] knuckle pic

[Farrell]

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Perhaps another good way to evaluate a knuckle-to-center-pin distance =
match would be to adjust let-off so it did not occur, replace the front =
key pin punchings and felt with a block of wood, and then carefully =
measure hammer rise for a full key depression. The wood under the key at =
the front rail pin will ensure a repeatable key depression amount, and =
if the effective knuckle distance is the same on both the old and new =
shanks, the hammer rise will be exactly the same.

Terry Farrell

----- Original Message -----=20
From: "David Love" <davidlovepianos@earthlink.net>
To: "Barbara Richmond" <piano57@flash.net>; "Pianotech" =
<pianotech@ptg.org>
Sent: Wednesday, March 10, 2004 11:31 PM
Subject: Re: [Files] knuckle pic


> I have a sample kit of Abel parts that I got from Wally Brooks.  =
Basically,
> I weighed the strike weight of the hammer assembly on a sample note =
and
> also measured the corresponding balance weight ((UW + DW)/2).  Then I =
took
> a sample shank and wrapped a piece of lead solder around the end of =
the
> shank to duplicate the SW of the original sample (easier than trying =
to
> find a hammer just the right weight).  Put it on the piano and =
measured the
> balance weight again.  It was closest to the original with the 18mm =
flange.
> Abel and Renner both make a 17mm flange but only Abel makes an 18 mm
> flange.  Since there was a bit more lead in the key than I would like =
at
> the target strike weight for that note, I opted for the 18mm flange.=20
> Double checked the regulation as well.=20
>=20
> David Love
> davidlovepianos@earthlink.net
>=20
>=20
> > [Original Message]
> > From: Barbara Richmond <piano57@flash.net>
> > To: <davidlovepianos@earthlink.net>; Pianotech <pianotech@ptg.org>
> > Date: 3/10/2004 8:19:07 PM
> > Subject: Re: [Files] knuckle pic
> >
> > So, David, what did you do?  Did you measure, figure what was close =
and
> buy
> > some samples?
> >
> > Barbara Richmond
> >
> > ----- Original Message -----
> > From: "David Love" <davidlovepianos@earthlink.net>
> > To: "Pianotech" <pianotech@ptg.org>; <files@ptg.org>
> > Sent: Wednesday, March 10, 2004 8:46 PM
> > Subject: RE: [Files] knuckle pic
> >
> >
> > Speaking of which, I am replacing a set of these on an AB Chase.  =
One of
> > the challenges of these knuckles is trying to determine just where =
the
> > leverage point is.  You don't exactly have the normal core/center =
pin
> > dimension to reference.  It appears, however, from my initial =
trials, that
> > it corresponds most closely to a C-18 shank from Abel, i.e. a Mason =
Hamlin
> > style shank with an 18 mm knuckle to center dimension.
> >
> > David Love
> > davidlovepianos@earthlink.net
>=20
>=20
>=20
> _______________________________________________
> pianotech list info: https://www.moypiano.com/resources/#archives
> 
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