7x2 Pulley Wheel (6mm Shaft)

Technical Details

• Mounting Type: Press-fit or Set-screw (Batch dependent).

• Load Capacity: High (Suitable for medium-scale robotics).

• Color: Typically Black/Grey (Standard Industrial).

Prototyping and Engineering Tips from Robogears

• Shaft Attachment: CRITICAL: If the pulley is a "loose fit" on your 6mm shaft, do not rely solely on glue. Use a 6mm to 6mm coupling or drill a small hole through the hub to insert a "Grub Screw" or a "Clevis Pin." This ensures the pulley doesn't slip under a heavy mechanical load.

• Mechanical Advantage Calculation: If you connect this 70mm pulley to a 10mm motor pulley via a belt, you create a 7:1 gear reduction. This means your output torque increases by 7 times, while the speed decreases by 7 times—perfect for lifting heavy weights or driving slow-moving robots.

• Belt Alignment: When using this as part of a belt-drive system, ensure the two pulleys are perfectly parallel. If they are even slightly angled, the belt will slowly "walk" off the edge of the 2cm wide surface and eventually derail during operation.

• Reducing Friction: If you are using this as an "Idler" (a wheel that spins freely on an axle), apply a small amount of Lithium Grease or insert a 6mm ID Ball Bearing (if the hub allows) to ensure smooth rotation and prevent the plastic bore from wearing out over time.

• Customizing the Grip: If you are using this pulley as a drive wheel and the belt is slipping, you can wrap a piece of Rubber Friction Tape around the 70mm circumference to increase the "bite" or traction between the pulley and the belt.

Package Includes

• 1 x 7x2 Pulley Wheel (6mm Bore)

Disclaimer: Product images are shown for illustrative purposes only. The exact color of the wheel or the branding placement on the hub may vary slightly between manufacturing batches, but all technical specifications and the 7x2 performance standards remain as described. This disclaimer also applies to any variations in the internal spoke design.

Safety Warning: Ensure the pulley is securely fastened to the shaft before applying power. A large 7cm pulley spinning at high RPM carries significant kinetic energy; keep fingers and loose clothing clear of the belt and pulley interface. Always verify that the belt tension is balanced to avoid snapping the motor shaft.