Best Servo Motor Planetary Gearbox for CNC Machines
Delve into a curated selection of planetary gearboxes tailored for servo motors. This guide highlights highly compatible, compact, and efficient gear reducers that boost torque while maintaining precision. Each product below matches common 19mm or 80mm servo motor configurations, suitable for CNC lathes, routers, engravers, and motorized benches. Explore key specs, installation notes, and how these gearboxes can affect performance in real-world applications.
| Product | Brand | Gear Ratio | Shaft Size | Frame/Size | Key Benefit |
|---|---|---|---|---|---|
| Planetary Gearbox Speed Reducer Gear Head 10:1 | TOSEASTARS | 10:1 | 19mm input; 20mm output | 80×80 mm | Low backlash; compact 80mm servo fit |
| Planetary Gearbox Speed Reducer Gear Head 20:1 | TOSEASTARS | 20:1 | 19mm input; 20mm output | 80×80 mm | Moderate reduction; good torque |
| Planetary Gearbox Ratio 50:1 | TOSEASTARS | 50:1 | 19mm input; 20mm output | 90×90 mm | High torque; stable holding |
| Planetary Gearbox 5:1 For Nema 17 | STEPPERONLINE | 5:1 | 42mm flange; 16mm output | 42×42 mm (flange) | Compact for small CNC/3D printers |
| 19mm Shaft Planetary Gearbox 16:1 | Bestopper | 16:1 | 19mm input; 16mm output | 80mm input/output flange | High torque with keyed outputs |
Planetary Gearbox Speed Reducer 10:1 for 80mm Servo
TOSEASTARS provides a compact 80×80 mm planetary gearbox designed for an 80 mm servo motor with a 19 mm input shaft and a 20 mm output shaft. The unit features a 10:1 gear ratio and a backlash of <= 7 arc-min, delivering precise torque reduction with high efficiency (up to 96%). It supports up to 6000 rpm input and emphasizes space-saving design for CNC engraving machines, milling machines, lathes, and other compact setups. The gearbox length is 114 mm excluding the output shaft.
Planetary Gearbox 100:1 for 60mm Servo
This 60 mm frame size planetary gearbox is optimized for smaller servo motors. It offers a 100:1 reduction with adjustable input/output compatibility (11 mm and 14 mm shafts on the input side; 14 mm on the output). It provides low-noise operation and long life, with a stated lifespan of about 20,000 hours and a high torque capacity suitable for CNC lathes, routers, and benchtop machines.
Planetary Gearbox 20:1 For 80mm Servo
Designed for 80 mm servo motors, this 80×80 mm gearbox uses a 19 mm input shaft and 20 mm output shaft, with a 136.5 mm body length. The 20:1 ratio provides a balance of reduced speed with sustained torque. Backlash is rated at <= 12 arc-min, with efficiency around 94% and a maximum input speed of 6000 rpm. A suitable option for precise control in CNC engraving, milling, lathes, and workbenches.
Planetary Gearbox 50:1 For CNC Machines
This 90×90 mm frame size gearbox for 80 mm servo motors features a 50:1 gear ratio and a 19 mm input shaft with a 20 mm output shaft. Its backlash sits at <= 12 arc-min, and it provides a solid 94% efficiency with a 6000 rpm max input. The unit is widely used to reduce speed and boost holding torque in CNC engraving machines, milling machines, lathes, and other compact setups where space is at a premium.
STEPPERONLINE 5:1 Planetary Gearbox For Nema 17
Designed for NEMA 17 stepper motors, this 42×42 mm gearbox features a 5:1 reduction with a 42 mm flange, 16 mm output shaft, and a compact footprint ideal for DIY CNC, robotic arms, or small 3D printers. It emphasizes high torque, long life, and low noise operation, making it suitable for precise positioning tasks in compact systems.
19mm Shaft Servo Motor Planetary Gearbox 16:1
Bestopper’s 16:1 planetary gearbox is designed for 19 mm input shafts with a 16 mm output. It offers 16:1 reduction with 80 mm input/output flange compatibility. The unit is intended for CNC machines and other machinery requiring higher torque without sacrificing compactness. It is specifically characterized by a robust 80 mm flange arrangement and keyed outputs for secure coupling.
GoolRC 1/3 Planetary Gear Reduction Unit
This 1/3 planetary gearbox unit is designed for 540 motor RC cars, providing torque augmentation for reduced speed. The gearhead emphasizes reliable power distribution and smooth torque delivery, suitable for projects requiring careful power management in compact RC-like setups or small mechanical rigs.
STEPPERONLINE 5:1 Planetary Gearbox For Nema 17
Another STEPPERONLINE model for NEMA 17 motors, this unit uses a 5:1 planetary reduction with a 42 mm flange and compact dimensions. It provides bipolar stepper compatibility, holding torque of 1.68 Nm, and is designed for DIY CNC projects, 3D printers, and robotics with a simple, reliable gearhead solution.
Buying Guide
When choosing a planetary gearbox for servo or stepper motors, consider the following:
- Motor compatibility: Confirm shaft diameters (input and output), flange size, and mating options (e.g., 19 mm or 16 mm shafts, 42 mm flange).
- Gear ratio vs. torque needs: Higher ratios reduce speed more but may require stronger motors or longer torque delivery; balance with desired precision and cycle life.
- Backlash and rigidity: Lower arc-min backlash improves positional accuracy and repeatability; torsion rigidity relates to vibration resistance during operation.
- Diameter, length, and mounting: Ensure the gearbox fits your machine’s envelope and mounting hole spacing; consider overall length excluding output shaft.
- Efficiency and heat: Higher efficiency helps reduce heat; assess max input speed and continuous duty requirements for CNC or robotics.
- Noise and life: Noise under 60 dB is common in these models; long-life expectations (e.g., 20,000 hours) suit industrial workloads.
- Application fit: For CNC lathes, mills, engravers, or benchtop machines, match gearhead size and weight to avoid stressing the motor.
In practice, users often prioritize a balance between backlash, torque, and space constraints. For lightweight, high-precision tasks, a 10:1 or 16:1 reduction with tight backlash can deliver stable positioning. For heavier load tasks, 20:1 to 50:1 ratios provide increased holding torque, though they may require motors with higher stall torque and robust mounting.