Mounting a pulley onto a motor shaft is a demanding application, especially in belt-driven systems that generate high side loads and torque. The assembly must resist rotational slip caused by torque and axial force caused by belt tension, all while handling constant vibration. Conventional keyways and set screws are prone to failure, micro-movement, and fretting corrosion under these dynamic loads. A retaining compound eliminates this clearance, creating a rigid, slip-free bond that maximizes power transmission and minimizes component wear.
INCURE WeldLock™ 365 Retaining Compound
For critical, high-load pulleys—where permanent retention and resistance to heat are essential—the WeldLock™ 365provides the highest structural strength. Its superior shear resistance prevents the pulley from spinning on the shaft and ensures maximum belt tension can be maintained without component failure.
| Feature & Benefit | Technical Insight for Pulley-Shaft Assemblies | Conversion Value |
| Highest Strength (365) | Cures to an extremely high-shear strength, rigid plastic, providing maximum resistance to torsional slip and heavy radial belt load. | Zero Slippage: Guarantees absolute, 100%torque transmission and prevents fretting corrosion. |
| High Temperature Resistance | Withstands continuous operational temperatures up to 200∘C (392∘F), necessary for pulleys generating friction heat under heavy belt loading. | End the Heat Threat: Ensures the bond remains strong and rigid under maximum thermal load. |
| Fills Close Clearance Gaps | Ideal for components with an interference or true close-tolerance slip fit (less than 0.05 mm diametral clearance). | Maximizes Contact: Converts the fit into an integrated component, optimizing balance and concentricity. |
| High Vibration Dampening | The rigid polymer fills the entire gap, preventing metal-to-metal contact and dampening vibration throughout the joint. | Extended Component Life: Reduces stress on the shaft, keyway, and bearings. |
Application Steps: Locking Pulleys for Maximum Reliability
Preparation (Essential): Thoroughly clean both the pulley bore and the motor shaft surface. Remove all oil, grease, paint, and residue. Use a degreasing solvent (like acetone or brake cleaner) and wipe until both metal surfaces are perfectly dry.
Application: Apply a continuous, liberal bead of WeldLock™ 365 evenly around the shaft surface. Alternatively, apply it to the inside circumference of the pulley bore. Ensure the compound completely covers the mating area.
Assembly: Slide or press the pulley onto the shaft. Ensure the pulley is seated correctly (axially) and wipe away any excess compound immediately.
Curing Time (Critical): Allow a minimum of 24 hours for the compound to reach full cure strength before applying belt tension, high torque, or operational speeds.
Alternative Consideration (Worn or Large Gaps): If the bore-to-shaft clearance is larger (up to 0.25 mm), use INCURE WeldLock™ 356 (Metallic Grey). This compound is formulated with metallic fillers to tolerate larger gaps while still providing high retention strength.
Stop risking pulley slippage and ensure your belt drive assemblies are absolutely secure.