Cycloidal Drive Nema 17

Cycloidal Gearbox 1:19 – NEMA 17 Compatible

This is a compact cycloidal gearbox with a reduction ratio of 1:19, designed to work with a NEMA 17 stepper motor. The mechanism provides smooth motion, high torque output, and good mechanical efficiency for robotics and DIY automation projects.

🔧 Required hardware

To assemble the gearbox, the following components are needed:

• 7× M3 threaded inserts
• 7× M3 screws (20 mm length)
• 1× M3 screw (6 mm length)
• 3× bearings 19×10×5 mm
• 1× bearing 45×58×7 mm
• Nylon spacers (M3, 7 mm outer diameter, 10 mm length) – can also be 3D printed

⚙️ Assembly notes

• All M3 threaded inserts must be heat-set into the printed parts, including the motor housing.
• The 3× 19×10×5 bearings must be mounted on the main shaft.
• The 45×58×7 bearing is installed in the motor housing and supports the NEMA 17 mounting side.
• The M3 × 6 mm screw is used to connect the shaft to the eccentric (off-center) drive element.
• Nylon spacers are used as pin guides; printed versions can be used as an alternative to purchased parts.

⚡ Motor compatibility

• Designed for NEMA 17 stepper motors
• Direct mounting without additional adapters required

This cycloidal drive is suitable for applications requiring high torque in a compact form factor, such as robotics, automation systems, and custom mechanical builds.