On 01may11 dana noticed that the turret floor
was not moving smoothly when it passed through some turret positions.
On 03may11 data was taken to check the smoothness of the motion.
The setup was:
sample turret motor amp and speed output once/second.
move turret from 26 to 339 degrees and back.
do the moves at 3deg/sec, 1 deg/sec, and .25 deg/sec.