Shafting, Pulleys, Belting and Rope Transmission

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Hill, 1908 - Power transmission - 157 pages
 

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Page 139 - Half-strand 7' must now be taken care of; at the right of the knot made with 2' and 7', 2' is slightly raised with a marlin spike, and 7' passed or tucked around it two or three times, these two half-strands forming in this way a whole strand. Half-strand 7' is tucked until cover 2 is reached, whose yarns are divided and 7' passed through them and drawn under the two adjacent strands, forming again the lock.
Page 136 - M', crotch the four pairs of strands thus opened (Fig. 1946a), cores having been drawn out together on the upper side. Then, having removed marking twine M, unlay the two strands 6 and 8, still in pairs, back a distance of two feet, to A; the strands 1 and 3, also in pairs, being carefully laid in their place. Next unlay the strands 5 and 7 in pairs, to A', replacing them as before with 2 and 4. The rope is now as shown in Fig.
Page 107 - It travels from p to m and goes on pulley A while stretched. At or before reaching point n, as the tension decreases it contracts to one inch and so completes the cycle. With a light load the belt creeps ahead of the pulley B at or near the point p. If the load is heavy the creep works toward the point o and the belt may slip.
Page 136 - The rope is first placed around sheaves, and, with a tackle, stretched and hauled taut; the ends should pass each other from six to seven feet, the passing point being marked with twine on each rope. The rope is then slipped from the sheaves and allowed to rest on shafts, to give sufficient slack for making the splice. Unlay the strands in pairs as far back as the twines M, M', crotch the four pairs of strands thus opened (Fig.
Page 139 - In no event pass 2' over these or any other strands. Half-strand 7' must now be taken care of; at the right of the knot made with 2
Page 107 - It now travels from p to m and goes on to pulley A while stretched. At or before reaching the point n, as the tension decreases, it contracts to one inch and so completes the cycle. With a light load the belt creeps ahead of the pulley B at or near the point p. If the load is heavy, the creep works...
Page 139 - ... tucked"; this operation is described for strands 2 and 7, the method being identical for the other three pairs. Unlay 2 and 7 for about twelve to fourteen inches, divide each strand in half by removing its cover yarns (see Fig. i0i), whip with twine the ends of interior yarns 2...
Page 139 - Fig. i00, and after the eight strands have been cut to convenient working lengths (about two feet), the companion strands are ready to be fastened together and "tucked"; this operation is described for strands 2 and 7, the method being identical for the other three pairs.
Page 138 - The pair of strands 6 and 8 are now separated, and 8 unlaid four feet back to B, a distance of six feet from center, strand 6 being left at A. The pair of strands 1 and 3 having been separated, 3 is left at A, as companion for 6, strand 1 being carefully laid in place of strand 8 until they meet at point B, The two pairs of strands 2-4 and 5-7 are now separated and laid in the same manner, every care being taken, while thus putting the rope together, that original twist and lay of strand is maintained....
Page 106 - The question of the minimum amount of slip of a belt in transmitting power from one pulley to another, reduces itself to a question of creep, for it is possible to have belts large enough so that with proper tensions, there will be no regular slip. With a difference in tension on the two sides and elasticity in the belt, creep however is bound to take place. What does it amount to and what allowance should be made for it?

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