Posted by Andy Martin on April 15, 2018 at 21:12:45 from (209.213.149.120):
In Reply to: Hydraulic Math posted by LeakyBoot on April 15, 2018 at 06:36:23:
Quoting Removed, click Modern View to see
It is complicated by the fact that he said lift was by retracting the working cylinder. So he would be tying the cylinders rod end to rod end.
For those who are having trouble with a cylinder making more pressure, you can think about the cylinder having 1,500 pounds/sq in on the piston, 14.7 pounds/sq in air pressure on the rod, and the oil around the rod has to be high enough to make up for the low pressure on the rod.
I've seen systems which apply pressure to both sides on a cylinder to extend it fast under low load. Then all you have is pressure on the rod and as the piston goes out the excess oil goes back into the head end and increases the speed dramatically.
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