Leverage and Dip

[Isaac OLEG]

That is why action spread changes are not so much changing the overall
ratio in terms of weight or distance, mostly the friction and magic
lines off more or less ?

Isaac O



> -----Message d'origine-----
> De : pianotech-bounces@ptg.org
> [mailto:pianotech-bounces@ptg.org]De la
> part de David Love
> Envoyé : vendredi 4 octobre 2002 01:24
> À : Pianotech
> Objet : Re: Leverage and Dip
>
>
> The simplest way to look at this is with a teeter-totter.
> With fulcrum
> centered there is a 1:1 relationship with weight placed at
> either end,
> 100lbs will balance 100lbs and the arc scribed at one end
> will be duplicated
> at the other end.  Move the fulcrum so that one side is
> twice the length of
> the other.  Now, 100lbs on the shorter end will be balanced
> by 50 lbs at the
> end twice its length, and the arc scribed by the short end
> will also be 1/2
> of the arc scribed by the long end.  The 2:1 relationship
> is maintained both
> in terms of force leverage and distance leverage.  Though a
> piano consists
> of 3 levers, the overall relationship of input to output
> doesn't change.  At
> least that is my understanding.
>
> David Love
>
>
> ----- Original Message -----
> From: "Richard Brekne" <Richard.Brekne@grieg.uib.no>
> To: "Pianotech" <pianotech@ptg.org>
> Sent: October 03, 2002 2:31 PM
> Subject: Re: Leverage and Dip
>
>
> Before we go on... :)  could we resolve what seems to be
> two mutually
> exclusive standpoints here ?
>
> Bill Ballard wrote:
>
> > The problem is of course that there is no direct
> correlation between
> > action leverage as measure by distance and by weight.
>
> David Love writes:
>
> >The action ratio not only refers to the relationship
> between change in
> >weight at the hammer and the resultant change in weight at
> the key, it
> also
> >refers to the relationship between key travel and hammer travel...
>
> snip snip.....
>
> >At a ratio of 6:1, for example, 10 mm of dip
> >will result in the hammer traveling a total of 60 mm.  (It
> also means
> that a
> >change in 1 gram at the key will result in a change of 6
> grams in the
> >balance weight.)
>
>
> I dont mean to be a pain or anything... but you two seem to
> be saying
> exactly the opposite about this, and its kind of a central point.
>
> Thanks to both of you for some good reading... Its late and
> I have been
> putting in 18 hour days this last week... so I will re-read both
> tommorrow and get back to you.
>
>
> Cheers
>
> RicB
> --
> Richard Brekne
> RPT, N.P.T.F.
> UiB, Bergen, Norway
> mailto:rbrekne@broadpark.no
> http://home.broadpark.no/~rbrekne/ricmain.html
>
>
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