Specify the required torque M on the power screw necessary to overcome a resistance of 490 N to motion of the carriage along its horizontal ways. The screw has a mean diameter of 21 mm and has two separate square threads which move the carriage 16 mm per revolution of the screw. The coefficient of friction may be taken as 0.15. Bearing Answer: M = i Bearing N.m

Specify the required torque M on the power screw necessary to overcome a resistance of 490 N to motion of the carriage along its horizontal ways. The screw has a mean diameter of 21 mm and has two separate square threads which move the carriage 16 mm per revolution of the screw. The coefficient of friction may be taken as 0.15. Bearing Answer: M = i Bearing N.m

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 7.90RP: The screw of the clamp has a square thread of pitch 0.16 in. and a mean diameter of 0.6 in. The...

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The screw of the clamp has a square thread of pitch 0.16 in. and a mean diameter of 0.6 in. The coefficient of static friction between the threads is 0.4. Determine (a) the torque C0 that must be applied to the screw in order to produce a 28-lb clamping force at A; and (b) the torque required to loosen the clamp.
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