27:1 Planetary Gearbox Nema 17 Stepper Motor DIY CNC Hobby Camera Robotics

27:1 Planetary Gearbox for NEMA 17 Stepper Motors in DIY CNC and robotics
✔️ Planetary gearbox 26.85:1, 0.067° step, 3 Nm torque, 4-wire

✅ Gearbox: Planetary, ratio 26.85:1; efficiency 81%; backlash <= 3 deg
✅ Motor: NEMA 17 bipolar, 4-wire; step angle 0.067 deg; holding torque 3 Nm
✅ Electrical: rated current 0.4 A; phase resistance 30 ohms; inductance 34 mH (+-20%)
✅ Shaft and dimensions: shaft 6 mm dia, 18 mm length; D-cut 12 mm
✅ Lead length: 500 mm (19.7 in)
✅ Physical size: frame 42 x 42 mm (1.65 x 1.65 in); motor length 34 mm; gearbox length 35 mm
✅ Weight: 420 g (0.93 lb)
✅ Connectors: Black(A+), Green(A-), Red(B+), Blue(B-)
✅ Warning: connect to a constant current or chopper drive controller to avoid damage

💡 What is a planetary gearbox used for in small motor projects?

In handy setups, a planetary gearbox delivers high torque in a compact form for precise motion. - Higher torque at low speeds improves positional accuracy in CNC and robotics.
- Compact size lets you fit gearheads in tight enclosures.
- Efficient reduction minimizes heat while boosting load capacity.