[pianotech] re; Action Ratio Measuring

[Joseph Garrett]

Ed,
Agree! However, the distance the Capstan travels in that "cycle", is, imo,
of little direct effect. A bit, of the whole package, for sure, but one of
the small players in that package.<G>
Joe


> [Original Message]
> From: Ed Foote <a440a at aol.com>
> To: <joegarrett at earthlink.net>; <pianotech at ptg.org>
> Date: 9/22/2012 7:18:40 PM
> Subject: Re: [pianotech] re; Action Ratio Measuring
>
>   "All actions are subject the accelerating action phenomena to changing 
> ratios thru the complete range of motion as the capstans is moving 
> further from the wip center pin and the increasing leverage efficiency 
> in the wip."
>
>
> Greetings,
>   From my perspecitve, If the geometry is such that the capstan's point 
> of contact is in line with the centers of both whippen and hammerflange 
> at half stroke, the capstan is moving closer to the whippen center pin 
> for the first half of its travel, and farther away during the latter 
> half. Hence, the ratio is increasing for the first half, and decreasing 
> for the second,which is against all that I understand about mechanical 
> efficiency.
>     I like actions whose capstan contact point reaches the "magic line" 
> just at let-off so that the highest ratio occurs at the very last part 
> of the stroke,where velocity is at its greatest, and the lowest ratio 
> at the beginning when there is so much mass to put into motion that a 
> lower speed and higher gear makes sense.
> Regards, .
>
> Ed Foote RPT
> http://www.piano-tuners.org/edfoote/well_tempered_piano.html
>
>