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Robotic Actuator EBA-34
NEW UPDATED Version 2024 - Planetary Gears Actuator EBA-34 for NEMA34
The EBA-34 is the largest actuator in the lineup, built for NEMA34 motors at a 38.4:1 ratio — the highest-torque option for the most demanding builds.
For the model in STEP file https://toolboxrobotics.com/shop
Efficiency Output Torque*
70% (conservative) 161.3 Nm
80% (typical) 184.3 Nm
85% (optimistic) 195.8 Nm
Typically 70–85% for 3D-printed planetary gears due to friction — real-world loss, not just a formality.
Efficiency Force at 200mm**
70% 806.4 N
80% 921.6 N
85% 979.2 N
The EBA-34 lands around 806–979 N at 200mm, roughly 4–5× the EBA-23's output.
That's roughly 100 kg-force equivalent.
One important flag at this scale: a force approaching ~1000 N (about 100 kg-force) through 3D-printed gears and a printed housing is a serious mechanical load — well beyond what most FDM-printed PLA/PETG parts survive under sustained or repeated use, even with 100% infill. If you're actually planning to load the EBA-34 anywhere near this figure, this is the actuator where I'd most strongly recommend testing the physical gear/housing before trusting the number — the motor may be capable of this torque long before your printed parts are.
* Calculator based on a standard common model NEMA34 stepper motor of 6.0 Nm.
** Torque to force at your 200mm (0.2m) lever arm.
Tools required for assembly
- Soldering Iron
- Hex key M5
- Hex key M6
Filaments
- 3D filament 1.75, 1KG, ±0.02 mm, PLA+ or ABS or PA-CF
Materials
- Ball Bearings 6mm 60 PCS
*You can use 6mm plastic balls from airsoft or Chrome steel for the ball bearing. - Synthetic Grease PERMATEX
Hardware
Screws, nuts & washers
- M5 Screws M5x16mm 8 PCS
- M5 Nuts 6 PCS
- M6 Screws M6x20mm 4 PCS
- M6 Spring Washers 4 PCS
- M6 Nuts 4 PCS
Inserts
- M5 Inserts M5x10mm 8 PCS
Electromechanical
- Nema 34 Stepper Motor 1 PCS