Robert,

I'm not sure what your application calls for and I'm also not sure how
tolerant you are on cost but you might want to bave a look at magnetic
particle clutches.  I've used them in variable torque applications and
they work just fine.  I found this  http://www.placidindustries.com/
(never used this company but the page gives a good general idea of what
to expect).

Dave

Robert Ussery wrote:
>
> Hi, Piccers!
> I've been looking around for an electric clutch for some time now with little success. Here are the specs I'm looking for:
> --> 1-20 lb holding force
> --> low power (<300 mAh
> --> fails in open position (i.e. normally open operation - closed when activated)
> --> low cost <$70
> Any solutions? Please note that these parameters are very flexible. If you know of anything that remotely fits the bill, please pass it along!
> BTW, this clutch will be used in a kind of "cruise control" (not for a car, though :o)  ), where it is desirable to have a manual override. The clutch will go between a servo and the throttle.
> Thanx again for your ideas!
>
> - Robert
>
> --
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http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.