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If the pulleys split or formed of separate sections that are bolted together at the rim, the maximum speed should be limited to about 55 to 60 percent of the maximum speed for solid ______.
pulleys
For steel pulleys may be run at about 6000 ______.
fpm
The maximum speed recommended for wood pulleys may be 5000 fpm for some pulleys and 10,000 fpm for others of different ______.
construction
A pulley having a cast-iron hub and arms, with a wood rim, has been operated under test at a rim speed of 29,000 ______.
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The minimum pulley diameters recommended for use with various belts are given in Table ______.
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The pulley face should be about 1 in. wider than the belts up to 12 in., 2 in. wider for 12 – to 24-in. belts, and 3 in. wider for belts over 24 in. ______.
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The face should be crowned to assist in keeping the belt ______.
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Standard pulleys are crowned by making the center diameter 1/9 in. per foot of face width larger than the edge ______.
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Flanges, single or double, may be used on pulleys to retain the ______.
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Performance of Flat Belts BELTS OPERATIONS Working Stress; 𝐒𝐖 'f' 16-16 Operating Velocity of Belts An examination of Eq. (16-9) indicates that at high velocities the power-transmitting capacity of the belt is seriously decreased by the centrifugal force; in fact at the higher velocities the power decreases until it is theoretically zero. This does not mean, as is sometimes claimed, that the belt will not transmit ______.
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