7x2 Pulley Wheel (6mm Shaft)

Specification	Details
Outer Diameter	7 cm (70mm)
Width/Thickness	2 cm (20mm)
Bore Diameter	6 mm (Center Hole)
Material	High-Impact Grade Plastic/Nylon
Compatibility	6mm Motor Shafts, D-Shafts, Axles
Groove Type	Flat/V-Groove (Batch Dependent)

Price

₹ 42.37

(Tax included)

Barcode: 72551452

Product Description

The 7x2 Pulley Wheel is a robust mechanical component designed for power transmission, belt-driven systems, and heavy-duty robotic platforms. With a generous 7cm diameter, this wheel provides a significant mechanical advantage, allowing for high-torque output when used in pulley-reduction systems. The 6mm center bore is precision-sized to fit common DC geared motors (like the RS-775 or high-torque planetary motors) and 6mm steel axles. Constructed from high-impact reinforced material, this wheel is built to withstand the stresses of belt tension and load carrying, making it a versatile choice for DIY conveyor belts, rope-lifting mechanisms, and custom RC vehicle drivetrains.

Key Features

High Torque Transfer: The large 70mm diameter is ideal for increasing the "torque" of a motor-driven system when used with a smaller drive pulley.
Precision 6mm Bore: Fits securely onto standard 6mm shafts, ensuring minimal "wobble" or eccentric rotation during high-speed operation.
Durable Construction: Made from wear-resistant materials that can handle the friction of rubber belts, ropes, or flat timing belts.
Multi-Purpose Hub: The wide 2cm face provides enough surface area for various belt types or can be used as a friction-drive wheel in tracked robot designs.
Lightweight Design: Despite its size, the wheel is engineered with a spoke or webbed structure to minimize rotational inertia, allowing for faster motor response.

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.