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Winches sheaves and purchases for flexible steel wire rope
Sheaves
This page contains guidelines to follow when working with sheaves, including the depth, sides and size of sheave grooves.
Sheaves
Sheaves lead the rope over a desired path and can provide a mechanical advantage when used in a pulley system. Follow these guidelines when working with sheaves and refer to crane manufacturer specifications or AS2089.
Sheave Groove Depth
The groove depth of a sheave should not be less than 1.5 times the rope diameter. If the rope is positively prevented from leaving the groove, the minimum depth can be equal to the rope diameter.
Sheave Groove Sides
The sheave groove sides should have a flare angle of a minimum of 42° and a maximum of 52°.
Sheave Groove Size
The grooves should be slightly larger than the nominal diameter of the rope. Grooves that are too large will cause the rope to flatten, while grooves that are too small will pinch the rope and cause extra friction that can cut it.
Sheave Finish
Sheaves should have a smooth finish with flared edges that are rounded-off.
Sheave Diameters
Refer to AS2089. Sheaves are designed for a particular crane or hoist and must be used for that purpose. When a rope is replaced, the replacement must be the same diameter and construction. The sheave system must be thoroughly checked to ensure that any damaged or worn grooves that could ruin the new rope are repaired or replaced.