Differences between General Torque (Trapezoidal Teeth) and High Torque (Arc Teeth) Timing Pulleys and Practical Selection Guide
■ Trapezoidal Teeth (General Torque: MXL/XL/L/H)
Stress concentrates at the tooth root, making it prone to fatigue failure and tooth jumping during sudden starts or high loads, thus suitable for lightweight equipment under medium to low loads.
■ Arc Teeth (High Torque: S-M/P-M)
Load is evenly distributed across the entire tooth surface, allowing for a torque capacity of more than twice. Deep grooves prevent tooth jumping during forward and reverse rotation, achieving low backlash and high rigidity, making it ideal for robots and CNC servo axes.
■ Practical/FAQ Points for Replacement: Changing from XL to S3M, etc., requires simultaneous replacement of the belt and pulley due to differences in pitch and tooth shape. S-M vs P-M: S-M is standard arc (quiet), while P-M is flat-top arc (for high-precision servo positioning). Additional Processing: When machining shaft holes and keyways, pay attention to coaxiality and shear strength to prevent wear due to eccentricity.

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