The rock drilling bottom hole assembly is lifted to the vertical position by app

Question

The rock drilling bottom hole assembly is lifted to the vertical position by applying an upward force, F, to a lifting cap as shown. The weight of the entire assembly is reported to be 150 kips, or 667,233 kN. When this lift is accomplished, estimate the maximum force, F, in the position shown, and estimate the bending moment at the base of the flange in the short section of tubing below the lifting cap (OD = 330 mm, wall thickness = 14.2 mm).

Explanation / Answer

M=0=mgl/2-F*l => F=333616.5 KN Bending Moment F 333616.5*10^3*1040*10^-3=346961160N-m

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