hammer acceleration

[David Love]

With any action job prior to doing a weigh-off I routinely put teflon powder
on the knuckles, polish the capstans and key pins, spray the top of the
balancier with McLube, ease at the front and balance rail, and regulate.  In
fact, I usually play the keys in a bit just to get the nap on the knuckles
smoothed down.  This particular phenomenon I have noticed occasionally and
just wonder if it doesn't have something to do with the geometry rather than
friction.
----- Original Message -----
From: "Richard Brekne" <rbrekne@operamail.com>
To: <pianotech@ptg.org>
Sent: August 24, 2001 1:04 PM
Subject: Re: hammer acceleration


> "David Love" <davidlovepianos@earthlink.net> wrote:
>
> >>   Roger/Newton:
> >
> >   In this case it is new parts.  Renner wippens, Abel shanks.  Center
pins
> >   are fine everything is lubricated properly and adequately.  I am aware
of
> >
> >   the static friction element but it seems more than that.   I do notice
> >   that the leather on the Abel shanks is much different than the leather
on
> >   Renner shanks, which I have generally used in the past.  The Abel
knuckles
> >   seem not as smooth and soft as Renner's.  Any comments on that?
> >
> >
> >     David Love
>
>
> You can try rubbing some Teflon powder into the knuckles and into the
whippen cushion. Inspect and polish the capstans as well.
> Another thing is to check out how the knuckles are glued on. You might be
suprised to see how many are "slightly" angled one way
> or the other and how much of a difference this can make. Of course even
regulation is also point.
>
>
>
> Richard Brekne
> RPT, NPTF
> Sydneskleiven 1
> 5010 Bergen Norway
> mailto:rbrekne@broadpark.no
>
>