The right gearbox enhances torque, precision, and speed control for stepper motors used in CNCs, 3D printers, cameras, and robotics. This guide highlights five standout planetary gearboxes from STEPPERONLINE that pair well with NEMA 17 and NEMA 23 motors. Each option balances torque, step angle, and frame size to fit common DIY and professional projects. Read on to compare key specs and suitability for your setup.
| Product | Gearbox Ratio | Frame Size | Step Angle | Motor Type |
|---|---|---|---|---|
| 5:1 Planetary Gearbox Nema17 (1.68A) | 5:1 | 42 x 42 mm | 0.72 deg | NEMA 17 Bipolar |
| 51:1 Planetary Gearbox Nema17 | 51:1 | — | 0.035 deg | NEMA 17 Bipolar |
| 27:1 Planetary Gearbox Nema17 | 27:1 | — | 0.067 deg | NEMA 17 Bipolar |
| 5:1 Planetary Gearbox Nema17 (0.4A) | 5:1 | — | 0.35 deg | NEMA 17 Bipolar |
| 47:1 Planetary Gearbox Nema23 | 47:1 | 60 x 60 mm | 0.75 deg | NEMA 23 Bipolar |
Note: These options are selected for compatibility with standard stepper configurations found in DIY CNCs and 3D printers. Each product page provides specific current ratings, dimensions, and compatibility details. The right choice depends on your motor current, required torque, desired speed, and available mounting space.
5:1 Planetary Gearbox for Nema17
Product features include bipolar operation with a holding torque of 1.68 Nm and a rated current per phase of 1.68 A. It uses a planetary gearbox with a compact 42 x 42 mm frame and a gearbox length of 27.3 mm. This configuration offers a solid balance of torque and speed for mid-range applications such as DIY CNC routers and 3D printers.
51:1 Planetary Gearbox for Nema17
Characterized by high torque at low speed, this 51:1 gearbox delivers precision with an ultra-fine step angle of 0.035 degrees. It’s designed for NEMA 17 bipolar 4-wire setups, suitable for camera rigs, robotics, and precise positioning tasks where slow, controlled motion is required.
27:1 Planetary Gearbox for Nema17
The 27:1 gear ratio offers a blend of torque and speed, with a 0.067 degree step angle. Designed for NEMA 17 bipolar 4-wire motors, this gearbox is well-suited for CNC hobby projects, small robotics, and light automation tasks where moderate speed with accurate positioning is key.
5:1 Planetary Gearbox for Nema17 (0.4A)
This version emphasizes low current operation with a 0.4 A per phase rating, still providing a practical torque boost. It features a 5:1 gearbox ratio and a 0.35 degree step angle, aligning well with medium-load projects needing energy efficiency and reliable performance on compact platforms.
47:1 Planetary Gearbox for Nema23
Designed for higher-torque needs, this NEMA 23 gearbox delivers substantial holding torque with a 2.8 A rated current per phase. The 47:1 ratio provides strong torque and reliable performance for milling, turning, and other demanding applications requiring significant output force and steady motion.
27:1 Planetary Gearbox for Nema17 (High Torque)
High torque with a 0.067 degree step angle, this NEMA 17 gearbox is suited for precise, high-load tasks such as 3D printer extrusion systems or camera platforms that require robust micro-stepping and dependable torque at low speeds.
Buying Guide: Key Considerations When Choosing a Stepper Gearbox
- Motor compatibility: Check frame size (NEMA 17 vs NEMA 23) and electrical ratings (current per phase) to ensure the gearbox matches your driver and motor.
- Gear ratio and torque: Higher ratios boost torque but reduce speed. Balance your need for holding power against your required travel velocity.
- Step angle and precision: Smaller step angles improve gradual positioning, crucial for CNC and robotics. Ensure the gearbox complements your control strategy.
- Physical dimensions: Consider mounting clearance, shaft alignment, and overall length to fit your machine’s geometry.
- Efficiency and heat: Higher current motors can generate heat; choose gearboxes that optimize torque without excessive current draw for your application.
- Maintenance and durability: Planetary gearboxes are common for reliability; verify material quality, lubrication, and expected service life for your environment.
- Application fit: For CNC milling or metalworking, prioritize higher torque gearboxes; for precise micro-positioning in cameras or printers, focus on low step angles and smooth operation.