Examine screw jack and lead screw function to store mechanical energy in their operation. Moreover, you need to calculate the operating efficiency of lead screw and the screw jack for the following examples. a) Where lead screw must raise up to 4KN with a square thread pitch of 1.5 mm and a mean diameter of 6mm, and the coefficient of friction is 0.15. The initial power of the machine is 89 W and the angular velocity of the 20 (rad/sec). b) Where a screw jack must raise a load of 4.9kN with thread pitch of 10mm and a diameter of 50mm. The coefficient of friction is 0.15. The effort is applied through a lever of radius 400 (mm).

Examine screw jack and lead screw function to store mechanical energy in their operation. Moreover, you need to calculate the operating efficiency of lead screw and the screw jack for the following examples. a) Where lead screw must raise up to 4KN with a square thread pitch of 1.5 mm and a mean diameter of 6mm, and the coefficient of friction is 0.15. The initial power of the machine is 89 W and the angular velocity of the 20 (rad/sec). b) Where a screw jack must raise a load of 4.9kN with thread pitch of 10mm and a diameter of 50mm. The coefficient of friction is 0.15. The effort is applied through a lever of radius 400 (mm).

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter10: Work, Energy And Machines

Section10.2: Machines

Problem 28PP

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