The clamp exerts a 145 lb compressive force on the wood blocks. Single-threaded screw BC has lead L = 0.190 in. and mean diameter d = 0.370 in. It turns in the threaded sleeve at C and pushes against B. The coefficient of static friction between the screw threads and the threaded sleeve is u. - 0.300. Neglect friction at B. 2 in. 2 in. 2 in. A C • 2.25 in. 2.40 in. 2.25 in. (a) Determine the value of the moment M in ft · Ib to increase the clamping force. (Enter the magnitude.) ft· Ib (b) Determine the value of the moment M in ft · Ib to decrease the clamping force. (Enter the magnitude.) ft · Ib

Question
The clamp exerts a 145 lb compressive force on the wood blocks. Single-threaded screw BC has lead L = 0.190 in. and mean diameter d = 0.370 in. It turns in the threaded sleeve at C and pushes against B. The coefficient of static
friction between the screw threads and the threaded sleeve is u. - 0.300. Neglect friction at B.
2 in. 2 in.
2 in.
A
C
•
2.25 in.
2.40 in.
2.25 in.
(a) Determine the value of the moment M in ft · Ib to increase the clamping force. (Enter the magnitude.)
ft· Ib
(b) Determine the value of the moment M in ft · Ib to decrease the clamping force. (Enter the magnitude.)
ft · Ib
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Transcribed Image Text

The clamp exerts a 145 lb compressive force on the wood blocks. Single-threaded screw BC has lead L = 0.190 in. and mean diameter d = 0.370 in. It turns in the threaded sleeve at C and pushes against B. The coefficient of static friction between the screw threads and the threaded sleeve is u. - 0.300. Neglect friction at B. 2 in. 2 in. 2 in. A C • 2.25 in. 2.40 in. 2.25 in. (a) Determine the value of the moment M in ft · Ib to increase the clamping force. (Enter the magnitude.) ft· Ib (b) Determine the value of the moment M in ft · Ib to decrease the clamping force. (Enter the magnitude.) ft · Ib

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