The sheathes for the falls must have a diameter at the base of the groove equal to at least ___.

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Multiple Choice

The sheathes for the falls must have a diameter at the base of the groove equal to at least ___.

Groove size on a sheave must allow the rope to bend smoothly without being pinched or riding up in the groove. A base of the groove that is twelve times the rope diameter gives a generous radius of curvature, spreading contact over a larger arc and reducing bending stress, wear, and heat on the rope. This helps the rope sit properly in the groove as it turns and minimizes damage during operation. Smaller groove bases would pinch the rope and wear it faster, while a much larger base isn’t necessary for standard equipment.

Groove size on a sheave must allow the rope to bend smoothly without being pinched or riding up in the groove. A base of the groove that is twelve times the rope diameter gives a generous radius of curvature, spreading contact over a larger arc and reducing bending stress, wear, and heat on the rope. This helps the rope sit properly in the groove as it turns and minimizes damage during operation. Smaller groove bases would pinch the rope and wear it faster, while a much larger base isn’t necessary for standard equipment.

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