The two-throw crankshaft is mounted in bearings at A and F, with the cranks spaced 90◦ apart. Each crank may be considered to have an eccentric weight of 6 lb at the center of the throw and 2 in from the axis of rotation. It is proposed to eliminate the rotating bearing reactions, which the crank would cause, by mounting additional correction weights on 3-in arms at points B and E.

Calculate the magnitudes and angular locations of these weights.

Figure P12.38