Metal plate A, shown in Fig. 6.70, is attached to block B by a double square threaded screw, which has a 1/16 inch spacing. The mean radius of the thread is 1/4 in. The coefficients of static and kinetic friction for the threads are 0.30 and 0.25, respectively, and the friction between plate A and the screw head is negligible. The screw is tightened using a torque wrench. Estimate the clamping force on plate A if the torque wrench indicates a measurement of 40 lb.ft a). when the screw is about to turn b) when it is turning.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Metal plate A, shown in Fig. 6.70, is attached to block B by a double square threaded screw, which has a 1/16 inch spacing. The mean radius of the thread is 1/4 in. The coefficients of static and kinetic friction for the threads are 0.30 and 0.25, respectively, and the friction between plate A and the screw head is negligible. The screw is tightened using a torque wrench. Estimate the clamping force on plate A if the torque wrench indicates a measurement of 40 lb.ft

a). when the screw is about to turn

b) when it is turning.

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