Stepper Motors

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If going for the smaller NEMA 14 motors, aim for the high torque option. You need approximately 1400 g.cm of holding torque or more to be safe. NEMA 14s are neater, lighter and smaller, but can be hard to get hold of. NEMA 17s are quite easy to get in the specification that Mendel needs, but are bulkier and less neat. NEMA 14s are running near the edge of their envelope: they will get warm. NEMA 17s are well inside what they can do, and will run cool.

Below is a list of possible suppliers and motors. Please add to it. If you have built a Mendel successfully with a given motor, remember to put Yes in the tested field.

Stepper Motors
Vendor (with link) Shipping location Manufacturer Model # Datasheet NEMA (Size) Torque Shaft Tested Additional notes
Motion Control Products Unknown Unknown FL35ST36-1004B FL35ST36-1004B Datasheet 14 . . true Used in mendel prototype
Active Robots UK Wantai/Phidget (?) Phidget 3301 3301 Datasheet 14  ?? 4.9mm true None
Zapp Automation Unknown Unknown SY42STH47-1684B SY42STH47-1684B Datasheet 17 . . true None
Interinar Electronics, LLC US Oriental Motors Vexta PX243M-01AA PX243M-01AA Datasheet 17 . . ? Not strong enough for direct drive extruder, Uses Imperial #4-40 TPI mounting holes instead of M3 metric, Link seems dead 24/Mar/2010
Alltronics.com US Lin Engineering 4218L-01-10 4218L-01-10 Datasheet 17 ~53 Ncm 3/16 inch = 4.7625 mm (Round) ? None
Alltronics.com US Lin Engineering 4218L-01-11 4218L-01-11 Datasheet 17 (?) ~53 Ncm ~5 mm = 0.1968 inches (D-Shape) true None
Phidgets.com US Wantai/Phidgets(?) Wantai 42BYGHW811 3303 Datasheet 17 . 4.9mm ? None
Robot Gear AU Mercury Motor SM-42BYG011-25 SM-42BYG011 Datasheet 17 . 5mm false None