The screw of the small press has a mean diameter of 25 mm and has a single square thread with a lead of 8 mm. The flat thrust bearing at A is shown in the enlarged view and has surfaces which are well worn. If the coefficient of friction for both the threads and the bearing at A is 0.25, calculate the design torque M on the hand wheel required (a) to produce a compressive force of 4 kN and (b) to loosen the press from the 4-kN compression.

The screw of the small press has a mean diameter of 25 mm and has a single square thread with a lead of 8 mm. The flat thrust bearing at A is shown in the enlarged view and has surfaces which are well worn. If the coefficient of friction for both the threads and the bearing at A is 0.25, calculate the design torque M on the hand wheel required (a) to produce a compressive force of 4 kN and (b) to loosen the press from the 4-kN compression.

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter7: Dry Friction

Section: Chapter Questions

Problem 7.58P: The screw of the carjack has a pitch of 0.1 in. and a mean radius of 0.175 in. Note that the ends of...

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Question

The screw of the small press
has a mean diameter of 25 mm and has a
single square thread with a lead of 8 mm. The
flat thrust bearing at A is shown in the
enlarged view and has surfaces which are well
worn. If the coefficient of friction for both the
threads and the bearing at A is 0.25, calculate
the design torque M on the hand wheel
required (a) to produce a compressive force of
4 kN and (b) to loosen the press from the 4-kN
compression.

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