skip for a mine shaft weighs 2000lb and is to lift a maximum load of 3000lb from a depth of 1000ft. The maximum speed of 20fps is attained in 5 sec. (a) What sizes of 6 x 19, IPS rope and sheave should be used for indefinite life and for N=1.3 on the basis of fatigue? (b) What is the design factor on the static basis? (c) What sizes of rope and sheave are required if the number of cycles (bending and unbending) in the desired life is 200,000? What is the corresponding static design factor? (d) What is the elongation of the rope found in (c) if the 3000lb load is added while the hoist hangs free at the bottom?(Use Faires)
skip for a mine shaft weighs 2000lb and is to lift a maximum load of 3000lb from a depth of 1000ft. The maximum speed of 20fps is attained in 5 sec. (a) What sizes of 6 x 19, IPS rope and sheave should be used for indefinite life and for N=1.3 on the basis of fatigue? (b) What is the design factor on the static basis? (c) What sizes of rope and sheave are required if the number of cycles (bending and unbending) in the desired life is 200,000? What is the corresponding static design factor? (d) What is the elongation of the rope found in (c) if the 3000lb load is added while the hoist hangs free at the bottom?(Use Faires)
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A skip for a mine shaft weighs 2000lb and is to lift a maximum load of 3000lb from a depth of 1000ft. The maximum speed of 20fps is attained in 5 sec. (a) What sizes of 6 x 19, IPS rope and sheave should be used for indefinite life and for N=1.3 on the basis of fatigue? (b) What is the design factor on the static basis? (c) What sizes of rope and sheave are required if the number of cycles (bending and unbending) in the desired life is 200,000? What is the corresponding static design factor? (d) What is the elongation of the rope found in (c) if the 3000lb load is added while the hoist hangs free at the bottom?(Use Faires)
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