Action Analyses (was Capstan Relocation)

[Farrell]

> "hey, did Kawai really reinvent the single grand action? weird"

No, Al Gore did.

Terry Farrell
Piano Tuning & Service
Tampa, Florida
mfarrel2@tampabay.rr.com

----- Original Message -----
From: "Clark" <caccola@net1plus.com>
To: <pianotech@ptg.org>
Sent: Monday, October 23, 2000 9:05 AM
Subject: Re: Action Analyses (was Capstan Relocation)


> Ron Nossaman wrote:
>
> > if the jack was
> > backstopped by a relatively light, short range spring instead of a
> > relatively firm felt, wouldn't the jack ride the knuckle through the
entire
> > range of movement, deflecting and rolling rather than sliding, and
produce
> > very nearly zero friction until letoff?
>
> It looks like Darrell Fandrich's grand action does this and ties the
> jack to the shank with the torsion spring, like to Diane Hofstetter's
> Fischer action in replacing the repetition lever. Another option is to
> incorporate a positive stop on the shank, per Broadwood and Steinway, or
> it could be on the part against which the jack bears, like the butt in
> single actions (hey, did Kawai really reinvent the single grand action?
> weird) or the intermediary lever such as Brown's later models,
> Gildemeester & Kroeger's and sort of in Alexander's.
>
> Richard Moody suggested reassessing the old window bearing felt,
> typically which is softer and may produce the same result. Also it has
> the effect of reducing the inertial mass of the jack potentially to
> speed its reseating (and three less holes means faster production).
>
>
> Clark
>