The pumping unit is used to recover oil. When the walking beam ABCABC is horizontal, the force acting in the wireline at the well head is FCFC = 250 lb. lb. Determine the torque MM which must be exerted by the motor in order to overcome this load. The horse-head CC weighs 61 lblb and has a center of gravity at GCGC. The walking beam ABCABC has a weight of 130 lblb and a center of gravity at GBGB, and the counterweight has a weight of 225 lblb and a center of gravity at GWGW. The pitman, ADAD, is pin connected at its ends and has negligible weight.

Ashielded metal arc-welding operation is accomplished in a work cell by a fitter and a welder. the fitter takes 5.5 min to load components into the welding fixture at the beginning of the work cycle, and 1.5 min to unload the completed weldment at the end of the cycle. the total ength of the weld seams 1200 mm, and the travel speed used by the welder averages 300 mm/min. every 600 mm of seam length, the welding stick must be changed, which takes 0.8 min. while the fitter is working, the welder is idle (resting): and while the welder is working the fitter is idle. (a) determine the average arc-on time as a fraction of the work cycle time. (b) how much improvement in arc-on time would result if the welder used flux-cored arc welding (manually operated), given that the spool of weld wire must be changed every 10 weldments, and it takes the welder 5.0 min to accomplish the change? (c) what are the production rates for these two cases (weldments completed per hour)? attach your work and solutions.