P3. (25 marks) A square-thread power screw (shown in figure) has a major diameter of 36 mm and a pitch of 4 mm with double threads. Find the effective (equivalent) stress at the root of the tooth. You are given the values for the external load, F, and the raising torque, $T_x$, in the data sheet.
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First, we need to calculate the shear stress at the root of the tooth. The shear stress can be calculated using the formula: Shear stress = Torque / (Pitch * Effective diameter) Show more…
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A square-thread power screw has a major diameter of 32 mm and a pitch of 4 mm with double threads, and it is to be used in an application similar to the Figure. The given data include fc = 0.08, dc = 40 mm, and F = 6.4 kN per screw: (a) Find the thread depth, thread width, pitch diameter, minor diameter, and lead. Find the torque required to raise and lower the load. Find the efficiency during lifting the load.
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