Monday, January 16, 2012
NEEDED: 2nd, 3rd, and even a 4th opinion.?
I have a mechanical/engineering question for all you engineering experts out there, that I would like a 2nd, 3rd, and even a 4th opinion on. This is a question about a knuckle press. Start with 2 ea, 24" long steel arms, br bushings and pins on each end. One end is pined to a solid anchor. Two ends, one male, one female, are pined together to form a hinged (knuckle) joint. The last end is pined to a movable object (guided ram), and the whole system is then mounted in a vertical position. A hydraulic cylinder is attached to the hinged or knuckle joint in a horizontal (90 degree) position. When cylinder is fully retracted, the total length of the two arms, which when in a straight line is 4', is now reduced to 3'6", which causes the lower eye to raise the attached plate (or ram) a total of 6". Now the question(s). How many tons pressure is required to push on the side of the arms to obtain 150 tons downward pressure in only the last 1" of the downward travel. Remembering that there is absolutely no resistance in the fist 5". The last 1' is where the ram will come into contact with the piece to be pressed. At this stage the two arms should be straight in line, and hydraulic cylinder should be fully extended. 2nd question. How much stroke is required in the hydraulic cylinder to raise the ram the required 6", and still fully close the ram ? WHEW!!!!
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