A screw jack with a 1-in. double-thread Acme screw is used to raise a load of...
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A screw jack with a 1-in. double-thread Acme screw is used to raise a load of 10,000 lb. A plain thrust collar of 2.0 in. mean diameter is used. Coefficients of running friction are estimated as 0.13 and 0.10 for f and fe, respectively. (See Figure P10.6.) (a) Determine the screw pitch, lead, thread depth, mean pitch diame- ter, and helix angle. (b) Estimate the starting torque for raising and for lowering the load. Estimate the efficiency of the jack when raising the load. (c) Weight 10,000 lb d2.0 in. fe=0.10 Force F f-0.13 1-in. double-thread Acme screw FIGURE P10.6 A screw jack with a 1-in. double-thread Acme screw is used to raise a load of 10,000 lb. A plain thrust collar of 2.0 in. mean diameter is used. Coefficients of running friction are estimated as 0.13 and 0.10 for f and fe, respectively. (See Figure P10.6.) (a) Determine the screw pitch, lead, thread depth, mean pitch diame- ter, and helix angle. (b) Estimate the starting torque for raising and for lowering the load. Estimate the efficiency of the jack when raising the load. (c) Weight 10,000 lb d2.0 in. fe=0.10 Force F f-0.13 1-in. double-thread Acme screw FIGURE P10.6
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Related Book For
Vector Mechanics for Engineers Statics and Dynamics
ISBN: 978-0073212227
8th Edition
Authors: Ferdinand Beer, E. Russell Johnston, Jr., Elliot Eisenberg, William Clausen, David Mazurek, Phillip Cornwell
Posted Date:
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