Virtual Capstan

[Ron Nossaman]

>Ok.. correct me if / where I am wrong then Ron
>
>In the example you give, the magnet uses an assumed 20 grams force for
>illustration purposes. You describe how that pans out in terms of its net 
>effect
>on the key front by adjusting this number by the ratio of the keyfront/magnet
>ratio divided by the keyfront/capstan ratio, AND by also adjusting this 
>number by
>the ratio of this second class lever which is the distance of the whippen 
>center
>to the center of the whippen magnet divided by the distance of the whippen 
>center
>to the center of the capstan. In both cases the results are added to the 
>capstan
>which are then adjusted again by the key ratio to arrive at the net DW at the
>front
>of the key.
>
>An attempt at an ascci whippen and key to illustrate....
>
>WC...........Cap.........WMag
>                  Cap.........KMag........BR.........KFront.
>
>
>20 grams x ((KMag,BW / KFront,BW) / (Cap,BW / KFront,BW)) yields the 
>magnets lift
>applied directly to the key
>
>and
>
>20 grams x (WC,WMag / WC,Cap) yeilds the net lift on the casptan by the magnet
>force upwards at the whippen magnet. This is a negative number because we are
>lightening the load on the capstan.

Unless I missed something, yes.


>Since both of these quantities are applied at the capstan... the net 
>result felt
>at the finger has to be adjusted by the ratio of the key at the capstan.
>
>A very neat way of viewing all net effects of this extra <<virtual capstan>>
>through the eyes of the real capstan and corresponding key ratio.

It's the simplest approach I came up with.