For a set of two double pulleys, the force acting on each should be equal to the tension in the rope times the number of ropes connected to the individual pulley if I understand correctly. In this pulley system on mcmaster, it looks as though the force acting on the upper pulley should be 5T (with T being tension) and the force acting on the lower 4T. Can anyone explain why the specs give an effort (which should be the tension) of 85 lbf to give a lifting force of 500 lbf. Why is it not 340 lbf (85*4).
Is my understanding of static pulley systems flawed?