Le mercredi 10 mars 2010 20:42:26, Dave a écrit :
> You could also just drop a solenoid plunger into sprocket teeth or
> something similar.
> 
> Sort of like throwing the proverbial wrench into the works...  ;-)
> 
> Nema 17 is pretty small stuff.
> 
> Dave
> 

problem with that is you will stop only at position determined by the number 
of theeth...


this is the device I was thinking about

http://www.precisionroller.com/find/4402235600.htm

this one looks very expesive, but you could get some used for free asking your 
local photocopier dealer/repair shop. 

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