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>>To make a stepper out of this, remove the inner rotor.  Make the can
>>from magnetic material, and place a set of coils outside the fixed
>>cylinder so that the can is pulled into contact by one of the coils.
>>Rotate the field one turn by energizing coils in sequence, and you
>>get 1/500 of a revolution on the can.
>>
>>I hope this picture is clear enough.  Does anyone know if these
>>contraptions are still available?
>
>Your description is great but,
>
>"A picture paints a thousand words but why can't I understand such a clear
>and concise description.."
>
>Anybody know where theres a picture of this 'device' ?

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I am not familiar with harmonic drives with integrated stepper motors (as
described in the previous message), but I can suggest a web site with a
description (including pictures) of a harmonic geardrive.  Please check out
the following web page:

        http://hdsystemsinc.com/techpage/operatn.htm

-Kevin.