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A 3/4-6 ACME threaded screw is used to lift a 2 kN load. Note that this...

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Mechanical Engineering

A 3/4-6 ACME threaded screw is used to lift a 2 kN load. Notethat this has a pitch of 1/6. The mean collar diameter is 4 cm.Find the torque to lift and to lower the load using a ball-bearingthrust washer. What are the efficiencies? Is it self locking? Youwill need to look up ACME thread size standards online for thisproblem

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