capstan

[Don]

Hi Vladan

The capstan is supposed to be "involute". i.e. it
doesn't slide at all--it rolls or rocks on the
whippen.

>I have never understood the reason for the capstan
>angle on older Steinways.  If anything, it seems to
me
>that the angle is in the wrong direction.  If I
wanted
>to design a minimum slip contact between the wippen
>heel and the capstan, I would angle the capstan so
>that the tangent to the top surface of the capstan is
>aligned with the line connecting the wippen flange
>center and the pivot of the key stick.  I think Ron
>Overs uses something like that in his action.


Regards,
Don Rose, B.Mus., A.M.U.S., A.MUS., R.P.T.
3004 Grant Rd, Regina, SK, S4S 5G7
Tuner for the Saskatchewan Centre of the Arts

http://us.geocities.com/drpt1948/


		
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