Following on from Kossel 3D Printer, and the tutorial videos (see Kossel construction videos) the BuildA3DPrinter kit comes with an extruder stepper motor with a planetary gearbox. This results in a very high torque. However, as stated below, it has been replaced by the 3325_0, a motor with the same NEMA size and same torque.
The main take away points are:
- 5:1 ratio
- High torque:
- 1.59 Nm (224.98 oz•in, 158 N•cm, 16.2 Kg•cm)
- 1.68 Nm (237.91 oz•in, 168 N•cm, 17.13 Kg•cm)
- 1.68 A
This NEMA-17 motor has an integrated Planetary gearbox with a 52/11:1 ratio. It generates 16.2 Kg-cm of torque at 1.68 Amps.
When connected to a 1067 – PhidgetStepper Bipolar HC, the 3317 has a maximum speed of a little over 900 RPM. At the output of the gearbox, the step angle is a little under 0.35°. When using the step angle in calculations, you should derive the exact step angle by dividing 1.8° by the gearbox reduction ratio.
This particular revision of the 3317 is made by a different manufacturer, but should behave very similarly to the revision 0 version.
Motor Controller and Connection
The 3317 stepper motor connects to a bipolar motor controller such as the 1067 – PhidgetStepper Bipolar HC.
The following table shows how to connect the motor wires to the board connectors to produce a clockwise rotation in the stepper motor when increasing position. To wire for counter-clockwise rotation when increasing position, reverse the red and blue wires.
Note: Make sure to unplug the power cord from the motor controller before switching wires around.
|Connecting the motor directly to a power supply will destroy the motor and void the warranty. If you want to check your motor make sure it is connected to a constant current / chopper drive controller.|
This bipolar stepper with planetary gearbox has a 0.347° step angle and 16.2 kg·cm of torque at low speeds.
Replaced by the 3325_0, a motor with the same NEMA size and same torque.
|Motor Type||Bipolar Stepper|
|Manufacturer Part Number||42STH38-1684A / 36JXS30K5.2G|
|Step Accuracy||5 %|
|Holding Torque||18 kg·cm|
|Rated Torque||16.2 kg·cm|
|Maximum Speed (w/1063 Motor Controller)||118 RPM|
|Maximum Speed (w/1067 Motor Controller)||904 RPM|
|Acceleration at Max Speed
(w/1067 Motor Controller)
|410000 1/16 steps/sec²|
|Recommended Voltage||12 V DC|
|Rated Current||1.7 A|
|Coil Resistance||1.7 Ω|
|Phase Inductance||3.2 mH|
|Shaft Diameter||8 mm|
|Mounting Plate Size||NEMA – 17|
|Number of Leads||4|
|Wire Length||300 mm|
|Gear Ratio||5 2⁄11 : 1|
|Maximum Strength of Gears||18 kg·cm|
|Shaft Maximum Axial Load||49.1 N|
|Shaft Maximum Radial Load||98.1 N|
- Free Shipping Nema17 Stepper Motor Ratio 5:1 Planetary Gearbox Extruder Gear, £23.16
- Extruder Gear Stepper Motor Ratio 5:1 Planetary Gearbox Nema 17 Step Motor Hot, AU $36.99 (£21.12) +AU $1.99 (£1.14) (does not ship to the UK)
- Extruder Gear Stepper Motor Ratio 5:1 Planetary Gearbox Nema 17 Step Motor OSM, £19.50 + £12.99
- Extruder Gear Stepper Motor Ratio 5:1 Planetary Gearbox Nema 17 Step Motor New, £20.99 (does not ship to Thailand, based in the UK)
|Manufacturer Part Number||17HS15-1684S-PG5|
|Motor Type||Bipolar Stepper|
|Step Angle(W/O Gearbox)||1.8°|
|Holding Torque||1.68Nm (237.91 oz•in, 168 N•cm, 17.13 Kg•cm)|
|Gear Ratio(Exact Gear Ratio)||5 + 2/11|
|Backlash at No-load||<=1°|
|Moment Permissible Torque||4Nm(566oz-in)|
|Shaft Maximum Axial Load||50N|
|Shaft Maximum Radial Load||100N|