Comments

• It was the motor current!  As soon as I adjusted it, the pulsing stopped and I can now plot.  THANKS for your help!

  in pen lift motor pulses and egg and pen motor don't move Comment by fire-497 March 2013
• Yes, they do slightly resist motion.  But that is it.  The pen lift arm makes a slight move about every half second.  It acts like they want to move, but more or less have the same pulse that the pen lift motor does.

  in pen lift motor pulses and egg and pen motor don't move Comment by fire-497 March 2013