78Pcs Plastic Gear Assorted Kit Set with Various Gear and Axle Belt Bushings for DIY Car Robot Project

Prototyping and Engineering Tips from Robogears

• Shaft Compatibility: Most gears in this kit have a 1.9mm hole. This is intentional to ensure they "bite" onto a standard 2mm DC motor shaft. Use a small flat tool to push them on evenly to avoid bending the motor shaft.

• Compound Gear Ratios: Use the double-layer gears to create high-torque reductions in a small space. By connecting the small inner gear of one to the large outer gear of the next, you can significantly increase the lifting power of a small motor.

• Belt Tension: When using the included rubber belts and pulleys, ensure the belt is slightly taut. If it's too loose, it will slip; if it's too tight, it will create excessive friction and stall your motor.

• Lubrication: While these plastic gears are designed for dry use, a tiny amount of plastic-safe silicone grease can significantly reduce noise and increase the lifespan of your gearbox during high-speed operation.

Package Includes

• 1 x 78-Piece Plastic Gear and Accessory Assortment Kit

Disclaimer Product images are shown for illustrative purposes only and may vary from the actual product due to manufacturing changes, lighting conditions during photography, or batch updates. While we strive for accuracy, technical specifications and exact piece counts per gear type are subject to change by the manufacturer without prior notice. Small parts included; please keep away from children under 3 years to avoid choking hazards. Ensure proper mechanical alignment to prevent gear stripping under high load.