A Double Square Threaded Power Screw Has An Efficiency Of 65% When Raising A Load. Friction Angle For Threads Is 8.54o, With Collar Friction Negligible. The Pitch Diameter Of The Screw Is 70 Mm. When Lowering A Load, A Uniform Speed Is Maintained By A Brake. If The Load Is 10 Tons, What Torque Must Be Exerted By The Brake? Is This Screw Self-locking?

A double square threaded power screw has an efficiency of 65% when raising a load. Friction angle for threads is 8.54o, with collar friction negligible. The pitch diameter of the screw is 70 mm. When lowering a load, a uniform speed is maintained by a brake. If the load is 10 tons, what torque must be exerted by the brake? Is this screw self-locking?

- October 10, 2022 - Edwin Tunner

A double square threaded power screw has an efficiency of 65% when raising a load. Friction angle for threads is 8.54^o, with collar friction negligible. The pitch diameter of the screw is 70 mm. When lowering a load, a uniform speed is maintained by a brake. If the load is 10 tons, what torque must be exerted by the brake? Is this screw self-locking?

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