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Rope will only coil closely on the drum within the distance between the centers of the pulleys. Spread or diagonal coiling will result outside this distance unless the drum is grooved: this is known as outside angling and with a grooved drum may amount to 1« degrees . After the normal line between the pulley and the drum is passed, the coils attempt to get back to this normal line. This produces friction crushing between the coils and a danger of coils mounting one over the other; this is known as inside angling and should be kept below 2 degrees . The amount of angling for a given distance between the pulleys will depend upon the distance between the headgear pulleys and the drum. Grooving the drum reduces the difficulties associated with angling. Syn: outside angling Sinclair, 5
Source: Dictionary of Mining, Mineral, and Related Terms

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