Question
Asked Nov 8, 2019
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The required clamping force at the board A is to be 1.7 kN . The square-threaded screw has a mean radius of 10 mm and a lead of 3 mm, and the coefficient of static friction is 0.3. (Figure 1)

Determine the torque M that must be applied to the screw to tighten it down.
Express your answer to three significant figures and include the appropriate units.
М
А2
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М А2

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Expert Answer

Step 1

Given data as per question

Clamping force=1.7KN

Mean radius of screw=10mm

Lead=3mm

Coefficient of the static friction=0.3

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P= tan ) tan (0.35) 19.29°

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Step 2
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h 1 tan в, 2 лr 1 3 в, 3 tan 2 лх10, в, 32.30

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