Hi, are there some basic recommendations on the steppers other then NEMA17? The Pololu boards only support bipolar steppers of course, but I was curious how much torq the ones you are testing have. Since these may be subjected to wind load and variable weight antennas I don’t want to wind up with an underpowered system.
Oh, and would this one work ok for reference?
Thanks!
-dosman
Hey,
For now we use this stepper motor. Theoretically the output torque of the system is 59Ncm * 60(torque ratio) = 3540Ncm for each axis.
We plan to redesign the rotator and calculate again all specs.
Very good, so we’re looking for ~84oz.in of power. For the Western Hemisphere, this ebay store seems to have about the best prices and ships from California (however sale is for 5 steppers if that is a problem for some). After this years Chinese holiday subsides other sources will return 
.
We recently picked up a few from Pololu when getting the drivers. At the time, they were on sale for about $13/ea, though apparently the sale is over by now.