Question

A diamond-drill boring machine consists of a steel bit set with diamonds which is rotated by means of hollow steel rods coupled by screw joints. Enough tension is maintained at the top of the shaft so that the compressive force between the bit and the bottom of the hole is small (negligible). If a torque of 2,000 ft-lb is applied to the top of the shaft, how deep would the hole be when yielding begins in the shaft? Yield strength is 50000psi. Use Maximum Shear Stress Theory.

Please write legibly.

Thank you.

Answer 1

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