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10.6 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. (c) Estimate the efficiency of the jack when raising the load. Weight = 10,000 lb de 2.0 in.- fe= 0.10- FIGURE P10.6 Force F -f= 0.13 1-in. double-thread. Acme screw

10.6 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. (c) Estimate the efficiency of the jack when raising the load. Weight = 10,000 lb de 2.0 in.- fe= 0.10- FIGURE P10.6 Force F -f= 0.13 1-in. double-thread. Acme screw

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10.6 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) (c) Estimate the starting torque for raising and for lowering the load. Estimate the efficiency of the jack when raising the load. Weight = 10,000 lb de = 2.0 in. f = 0.10- FIGURE P10.6 a Force F -f= 0.13 -1-in. double-thread Acme screw
Transcribed Image Text:10.6 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) (c) Estimate the starting torque for raising and for lowering the load. Estimate the efficiency of the jack when raising the load. Weight = 10,000 lb de = 2.0 in. f = 0.10- FIGURE P10.6 a Force F -f= 0.13 -1-in. double-thread Acme screw
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