Two Capstans again.....or something else?

[gordon stelter]

Dear List,
     It seems to me that the best solution would be a
small roller implanted in the wippen heel, where the
felt normally resides. It would run up an
appropriately shaped ramp, which is adjustable in
height to achieve hammer line. The shape of the ramp
would be carefully designed to achieve the mechanical
advantages desired at each phase of key stroke. The
materials of the roller and ramp would be JUST
resilient enough to avoid clicking.
     And for that matter, why not little rollers on
jacktips and tenders? If there is ONE place where 19th
century technology might beg for an upgrade, wouldn't
this be it? It worked for engine design (roller cams
and rockers).                                         
        Think about it! No more flattened knuckles,
less friction, less lost motion adjustment, and happy,
happy deer not donating their skin to these "art"
products which we call pianos!
     If anyone with a machine shop implements this,
please share the patent royalties with me.
     Thanks!
     Gordon

--- Richard Brekne <Richard.Brekne@grieg.uib.no>
wrote:
> Been thinking about this, and I suppose you are
> right Bill. There should
> be enough sliding motion to cause at least as much
> wear on the cushion
> as now.
> 
> Still, if you had nice rounded edges nicely polished
> perhaps that wear
> might not be so extreme as to offset the << benifit
> >> gotten in
> relation to the ratio.
> 
> Course this assumes that it is a benifit to in
> essence have a dynamic
> key ratio. How would that feel, I wonder, under
> actual play ? At the
> beginning of the key stroke you would have say a 5.7
> ratio... and
> gradually through the keystroke this would change to
> perhaps 6.0,
> Perhaps not so large a change... but just so.
> 
> Might be interesting to see in anycase. But somebody
> has had to have
> tried this out at somepoint in the past ... eh ?? or
> what ?
> 
> RicB
> 
> Bill Ballard wrote:
> 
> > At 3:52 PM -0800 1/16/03, David Ilvedson wrote:
> > >Wouldn't you need to change the shape of the
> sticker, wippen butt,
> > >etc. to fit the
> > >concave shape.  For some reason it seems it would
> bind...?
> >
> > I'm more worried by the fact that the bearing
> surface on the concave
> > cap is a thin circular rim, as opposed to the
> round dome of the
> > convex design. While it would alternate nicely
> between the leading
> > and trailing edges of that rim, it would also seem
> to scrape away at
> > the rep cushion in the process.
> >
> > Bill Ballard RPT
> > NH Chapter, P.T.G.
> 
> --
> Richard Brekne
> RPT, N.P.T.F.
> UiB, Bergen, Norway
> mailto:rbrekne@broadpark.no
> http://home.broadpark.no/~rbrekne/ricmain.html
> 
> 
> _______________________________________________
> pianotech list info:
https://www.moypiano.com/resources/#archives


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