Dave Caroline wrote:
> if the encoder is on the motor there will be a small hysteresis to the
> movement due to the friction.
> if on the screw then I can see a small effect on the loop as the servo
> will move and not the screw.
> can you rotate 90 degrees and hang the motor below.
>   
I put the encoders on the ballscrew, and have had no problem with it.  I 
do tension the
belt VERY tightly to eliminate any "flapping", and the belt is quite 
short, the shafts
are about 3" apart.

Jon

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