Action ratio and knuckle distance

[J Patrick Draine]

While it appears (from others' informed comments) that the Stanwood
system doesn't get into knuckle dimension, the converstaion does bring
to mind a presentation given by Bruce Clark of Mason & Hamlin (October
? of 2006, at the M&H factory). The problem that the calss started
with was, given a big ol' Chickering that another chapter member was
rebuilding, and assuming some arbitrary parts (maybe they were Balwin
repetitions??), how does one create an optimal action setup. He had
Powerpoint slides that gave all the(very detailed)  formulae to get it
done perfectly. Not that it's "EZ", a new keyboard is one of the
variables, as well as action parts.
Unfortunately Bruce didn't have handouts, and M&H was reluctant to
post the Powerpoint stuff on our chapter website (and most of us
couldn't scribble down the formulae as quickly as he flashed to the
next one).
This would be a great class for either the PTG Annual Institute, or
regional or local chapter presentation.
Patrick Draine

On 7/5/07, vince mrykalo <madvinmryk at yahoo.com> wrote:
> Is there a formula that uses knuckle dimensions in figuring out AR (action
> ratio)?  I am not finding it in my notes, and I remember some Stanwood
> formula that used that knuckle dimension in one of the formulas.
>
>
> From: "David Love" <davidlovepianos at comcast.net>
> To: "'Pianotech List'" <pianotech at ptg.org>
> Date: Wed, 4 Jul 2007 12:03:41 -0700
> Subject: RE: Action ratio and knuckle distance
>
>
>
>
> Actually, Stanwood's equation of balance won't tell you that.  The knuckle
> hanging is not isolated in the formula.  You have to sample and do a weigh
> off.
>
>
> David Love
> davidlovepianos at comcast.net
> www.davidlovepianos.com
> -----Original Message-----
> From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
> Of Farrell
> Sent: Wednesday, July 04, 2007 11:47 AM
> To: Pianotech List
> Subject: Re: Action ratio and knuckle distance
>
>
> Stanwood's equations of balance would tell you that. Are you familiar with
> David Stanwood's work?
>
>
>
> Terry Farrell
>
>
> ----- Original Message -----
>
> From: vince mrykalo
>
> To: pianotech at ptg.org
>
> Sent: Wednesday, July 04, 2007 2:03 PM
>
> Subject: Action ratio and knuckle distance
>
>
>
>
> How do you figure out the change that would occur in ACTION RATIO (AR) if
> everything remains constant (strike weight, front weight,wippen balance
> weight, and balance weight) except the knuckle is changed from 16.2 mm to
> 17mm, on paper, without actually trying it out on the action?
>
>
>
>
>
> Vince Mrykalo RPT MPT
>
> University of Utah
>
>
>
>
>
>
>
>
> Vince Mrykalo RPT MPT
> University of Utah
>
> "Minél több a változás, annál nagyobb az állandoság"
>
> The more I learn, the less I know.
>
> www.mrykalopiano.com
>
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