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

On 3/10/2010 2:32 PM, yann wrote:
> Le mercredi 10 mars 2010 18:11:13, doug metzler a écrit :
>    
>> for a small stepper motor, like a NEMA 17 I need a small (DC) electrically
>> driven lock that I can attach to the shaft such that when the power is
>> turned off the shaft is locked in place.
>>
>> Do any of you folks know of such a device?  I've been googling around but I
>> haven't been able to come up with the proper combination of search terms to
>> get at exactly what I'm looking for.
>>
>> Thanks,
>>
>> DougM
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>
> you could use a little clutch like the ones you can find in photocopiers to do
> this.
>
> old photocopiers are often a very interesting supply for smal mechanical
> parts, steppers, servos...
>
> ------------------------------------------------------------------------------
> Download Intel® Parallel Studio Eval
> Try the new software tools for yourself. Speed compiling, find bugs
> proactively, and fine-tune applications for parallel performance.
> See why Intel Parallel Studio got high marks during beta.
> http://p.sf.net/sfu/intel-sw-dev
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>    


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