Adjusting wippen assist springs

[gordon stelter]

Ah, yes, Rick. But would not decreased key inertia be
a very nice thing for we fools who must play,
sometimes, 4 hour gigs ???  Sometimes I can only stop
when my fingers have swollen up like suasages and
split open.( Blood on the keys can be hard to remove.)
     Thump

--- Richard Brekne <Richard.Brekne@grieg.uib.no>
wrote:
> 
> 
> Sarah Fox wrote:
> 
> > This is true, but only if one looks at the input
> side, without regard to
> > output.  With greater spring assist and less
> leading, that same 200 g of
> > force will produce greater hammer velocity and
> therefore more sound.
> >
> 
> One of the thing Jim Ellis keeps banging away at is
> that it is the hammers
> interia that domninates this whole picture. The keys
> intertia is only a small
> part relative to that. And his reasoning for
> discounting much of the touting of
> reduced key inertia enthusiasts makes sense. The
> mass of the hammer remains the
> same, so does the mass of the whippen. The actual
> amount of force needed to move
> the added inertia at the key (assuming reasonable
> levels of key leading) is not
> nearly so significant a factor as its made out to be
> then. And tho you do gain
> some small amount in terms of overall action
> inertia, you still dont get around
> the change in touchweight gradient.
> 
> Still the point you raise has never been quantified
> to my knowledge... and it
> would be nice to get a "net result" figure to see
> just exactly what is gained,
> what is lost, and what the side effects are.
> 
> Cheers
> RicB
> 
> 
> >
> > How?  If a greater proportion of your
> counterbalancing is done by spring
> > force, rather than key leading, there is
> considerably less inertia to fight
> > in the key during hard playing.  Remember, the
> kinetic energy of the hammer
> > is transferred to the strings (to a greater or
> lesser extent, depending on
> > the resiliency of the hammers), while the kinetic
> energy of the keystick is
> > transferred into the front rail, where it makes no
> sound but a "thud."  The
> > higher the ratio of hammer inertia to keystick
> inertia, the lesser the input
> > energy that must be delivered into the key to
> transfer a given amount of
> > energy to the string.
> >
> > Peace,
> > Sarah
> >
> > _______________________________________________
> > pianotech list info:
> https://www.moypiano.com/resources/#archives
> 
> --
> Richard Brekne
> RPT, N.P.T.F.
> UiB, Bergen, Norway
> mailto:rbrekne@broadpark.no
> http://home.broadpark.no/~rbrekne/ricmain.html
> http://www.hf.uib.no/grieg/personer/cv_RB.html
> 
> 
> _______________________________________________
> pianotech list info:
https://www.moypiano.com/resources/#archives


__________________________________
Do you Yahoo!?
New Yahoo! Photos - easier uploading and sharing.
http://photos.yahoo.com/