Fw: Action ratio and knuckle distance

[Absolute Piano]

> Indeed, Bruce Clarke does account for the knuckle placement in his 
> formulae. In fact, to the best of my knowledge, he seems to have all the 
> possible design parameters accounted for in his process. It does appear 
> complicated at first because it it so comprehensive and is primarily 
> intended for a design scenario where the keyboard would be altered 
> properly so the action is set-up at the half stroke. However, it is a 
> process that  lends itself very well to the rebuilder and can be used in 
> conjunction with the Stanwood System. The main advantage is that given any 
> combination of parts, he can set up the keyboard at half stroke on paper 
> or preferably a CAD program without all the usual trial and error that we 
> go through. It would be a great course but it has taken us several 
> Saturdays (all day) to get through the basics, but then again Stanwood's 
> course is a solid week as well.
>
> Sorry, no silver bullets here but they do exist (or at least as a 
> battalion). Ask Bruce.
>
> Jude Reveley, RPT
> Absolute Piano Restoration, LLC
> Lowell, Massachusetts
> (978) 323-4545
>
>
> ----- Original Message ----- 
> From: "J Patrick Draine" <jpdraine at gmail.com>
> To: "Pianotech List" <pianotech at ptg.org>
> Sent: Friday, July 06, 2007 9:13 AM
> Subject: Re: Action ratio and knuckle distance
>
>
>> 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
>>>
>>>  ________________________________
>>> Building a website is a piece of cake.
>>> Yahoo! Small Business gives you all the tools to get online.
>>>
>>>
>>
>>
>>
>