Question: Power is transmitted to the drill bit in a rock drilling rig using a hollow shaft which has an outer diameter of $300 mm.

Power is transmitted to the drill bit in a rock drilling rig using a hollow shaft which has an outer diameter

Power is transmitted to the drill bit in a rock drilling rig using a hollow shaft which has an outer diameter of $300 mm. The drilling operation requires a maximum shaft torque of 20 kN.m at 90 rpm. If the maximum shear stress allowable in the shaft is 150 MPa then, using MD Solids, determine the motor power required and inside diameter of the shaft for these conditions. Also, for these conditions, determine the angle of twist in the shaft over a length of 8 m if the shear modulus for the shaft material is 85 GPa. Save your MD Solids analysis as 'torsion.dat'. Power required at maximum torque: Angle of twist over 8 m: Shaft inside diameter:

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