Stepper Motors

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, put TESTED after the entry.

Europe

• The data sheet for the ones we used in the Mendel prototype is here. The company that supplied it is Motion Control Products Their part number is FL35ST36-1004B, though it is not a stocked item (yet) - they have to order it in. TESTED

• Active-robots.com (UK) stocks the Phidget NEMA14 motors made by Wantai.
  • Datasheet
  • Shaft diameter 4.9 mm

• Zapp Automation supply a good NEMA 17. Their part number is SY42STH47-1684B. TESTED

US

Interinar Electronics, LLC

• Vexta PX243M-01AA This motor will work ok for driving the axis but is not strong enough for a directly driven pinchwheel extruder.
  • torque = ~21 Ncm
  • Note: Uses Imperial #40 TPI mounting holes instead of M3 metric.

Alltronics.com

• Lin Engineering 4218L-01-10 These appear to have a round shaft without any flats which is good for a splined extruder. Also, since the diameter is 3/16 you can easily buy matching pulleys from mcmaster or sdp-si.
  • torque = ~53 Ncm
  • shaft diameter = 3/16 inch = 4.7625 mm

• Lin Engineering 4218L-01-11 These have a single flat on the shaft which works well for driving the axis using printed pulleys. TESTED
  • torque = ~53 Ncm
  • shaft diameter = ~5 mm = 0.1968 inches

Phidgits.com

• Wantai 42BYGHW811 Yet another nice motor. Hopefully this one stays in stock.
  • Datasheet
  • torque = ~47 Ncm
  • shaft diameter = 5mm

• Active-robots.com (UK) stocks the Phidget NEMA14 motors made by Wantai.
  • Datasheet.
  • Shaft diameter 4.9 mm