Robotic Actuator EBA-23

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NEW UPDATED Version 2024 - Planetary Gears Actuator EBA-23 for NEMA23

The EBA-23 drives NEMA23 motors at a 38.4:1 ratio, and is the higher-torque actuator used in the EB300 and EB310 arms alongside the EBA-17. A higher-torque 120:1 variant is also available (see note below) for builds that need more holding force.

For the model in STEP file https://toolboxrobotics.com/shop  

Efficiency                            Output Torque*

 70% (conservative)            33.9 Nm

 80% (typical)                       38.7 Nm 

 85% (optimistic)                 41.1 Nm

Typically 70–85% for 3D-printed planetary gears due to friction — real-world loss, not just a formality.

Efficiency                            Force at 200mm**

 70%                                       169.4 N

 80%                                       193.6 N

 85%                                       205.7 N

So the EBA-23 lands around 169–206 N at 200mm, roughly 80% more force than the EBA-17. That's roughly 17.5–20 kg-force equivalent at that point. The NEMA23 has approximately 2.5 times the gross motor torque of the NEMA17, applied through the same gear ratio.

Same caveat as before: this is the actuator's torque capability, not necessarily the maximum your 3D-printed structure can actually survive — worth stress-testing the mount and gear teeth before designing a payload around the full 200N figure.

Your printed gears, shaft, and mounting hardware may fail before the motor's rated torque is reached, especially with PLA/PETG gears under repeated load. 

* Calculator based on a standard common model NEMA23 stepper motor of 1.26 Nm.

** Torque to force at your 200mm (0.2m) lever arm.

• Soldering Iron
• Hex key M3
• Hex key M5

• 3D filament 1.75, 1KG, ±0.02 mm, PLA+ or ABS or PA-CF. 

• Ball Bearings 6mm   45 PCS
  *You can use 6mm plastic balls from airsoft or Chrome steel for the ball bearing.
• Synthetic Grease PERMATEX  

Screws, nuts & washers 

• M3 Screws M3x8mm    4 PCS
• M4 Nuts    6 PCS
• M5 Screws M5x12mm    4 PCS
• M5 Spring Washers    4 PCS
• M5 Nuts    4 PCS

Inserts

• M3 Inserts M3x8mm    8 PCS 

• Nema 23 Stepper Motor  1 PCS