Steve Blackmore wrote:
> On Wed, 2 Mar 2011 21:41:45 -0600, you wrote:
>
>   
>> Jon, this is a ACME type screw that moves the knee, not a ballscrew. It is
>> 100% self locking.
>>     
>
> Replace the servo with a stepper. There are also stepper drives
> available that will drop the current supplied by half when no steps
> received for some time.
>
>   
It would be expensive to do this.  He has an analog servo system using 
my PPMC board set.  There is no stepper option with this interface.  He 
could add an additional parallel port to the CPU and use software 
generated steps, I suppose.

Jon

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