Step Angle 0.35° - 3317_1 - NEMA-17 Bipolar 5.18:1 Planetary Gearbox Stepper

http://www.phidgets.com/products.php?product_id=3317

 

Product Features

• 99 1044/2057 : 1 Planetary Gearbox, High Torque
• 0.018° Step Angle
• Gearbox rated for sustained torque of 48 kg-cm
• NEMA-17 Bipolar 4-wire

$45 not bad for this step angle.
Solves the http://en.wikipedia.org/wiki/Polar_coordinate_system design's issues used in Rotational Art projects.

http://www.eztronics.nl/webshop2/catalog/Robotics?product_id=225 50 Euro