Channel Mount Gearbox Kit - Standard Rotation (3:1 Ratio)

A 3:1 gear ratio channel mount gearbox kit designed for use with standard-size servos. The threaded side mounts attach easily to Actobotics aluminium channel, tubing, and other structural components, making it straightforward to add servo-powered rotation to pan-and-tilt mechanisms, robotic arms, and custom builds.

The kit includes a hardened 12.7 mm (1/2″) stainless steel output shaft supported by dual ABEC-5 precision ball bearings, capable of handling up to 91 kg (200 lb) of vertical and horizontal load. The main spur gear is bolted directly to the drive hub, ensuring positive power transfer with no slipping.

Key Features

• 3:1 Gear Ratio – Increases torque output from a standard servo
• 180° Maximum Rotation – Controlled rotational range for precision positioning
• Heavy-Duty Bearings – Dual ABEC-5 ball bearings support up to 91 kg (200 lb)
• Stainless Steel Shaft – Hardened 12.7 mm (1/2″) output shaft
• Bolted Gear Hub – Direct power transfer with no gear slipping
• Actobotics Compatible – Threaded side mounts for channel and tubing attachment

Specifications

• Gear Ratio – 3:1
• Maximum Rotation – 180°
• Servo Size – Standard (Hitec compatible)
• Hub Pattern – 19.6 mm (0.770″)
• Output Shaft – 12.7 mm (1/2″) stainless steel
• Load Capacity – 91 kg (200 lb) vertical/horizontal
• Part Number – SPG400A-CM3

Package Contents

• 1× Channel Mount Gearbox (180° rotation)
• 1× Hub Mount Gear
• 1× 3:1 Servo Gear
• 1× 19.6 mm (0.770″) Servo Hub
• 1× 12.7 mm (1/2″) Clamp Hub
• 1× 6-32 × 3/8″ Set Screw
• 4× 6-32 × 1/2″ Socket Head Screws
• 4× 6-32 × 1/4″ Phillips Head Screws

Ideal For

• Robotic pan-and-tilt mechanisms
• Actobotics structural builds
• Custom mechanical devices and actuators
• Heavy-duty servo-driven assemblies