Virtual Capstan

[Richard Brekne]

Just to make sure I'm on the same page here...

Your center rail to capstan, magnet and keytop are taken as in the following
example

Top of the key front minus 10 mm to bottom of key at center of the balance rail
pin hole ?

Thanks..

RicB

Ron Nossaman wrote:

> Well, I wasn't interested in building an absolute theoretical piano model.
> I was just going to demonstrate as simply as possible the effects of the
> levers at work here. These are the figures from my own model and a guess of
> magnet weights. They'll suffice for the illustration.
>
> The first group defines leverage ratios and weights.
>
> center rail to magnet           moment3 95
> center rail to capstan          moment2 120
> keytop to center rail           moment1 220
> wip center to capstan           moment4 63
> wip center to magnet            moment5 80
> keytop to capstan               lever1          0.55
> keytop to magnet                lever2          0.43
> wip center to magnet            lever3          1.27
> magnet weight                           0.8
> wippen magnet assy weight                       4.6
> key magnet assy weight                  1.6
>

--
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