how do I connect up this hydraulic circuit.?
I am making a logsplitter and want to have it work this way. I want to use a tractor driven pto pump working the ram through a hand operated control valve. It is a heafty ram (7.5 litre volume with rod extended). I was wondering could I set it up in a way that it the logs are easy split we can have work at a resonably fast speed and maybe then when the logs are much harder split I could turn a knob somewhere along the line and slow down the extention speed and increace the power to split the toughest of knots. I hope this can be done. I was also wondering could it be set up so I just push the lever once and the ram extends to split the log and then another touch of lever and it would return to a preset position (which would be adjustable some if the logs were 150mm and some were 250mm I wouldnt have to wait for it to contract the 360mm travel it could). This is just an extra idea but I would be very happy with just the first circuit info. Thanks for the help.
Peter is right about the speed/force problem, you would most likely have to use two rams, with a shut-off valve to disable one of the rams when you want higher speed and less force. As for the variable extension idea, this is something that is used on drilling jumbos in mining. They need their feed rails to be variable length, so that they can drill in tight tunnels using shorter drill steels, but also drill longer holes in the face when they need to. The variable length feed rails use a 3-port cylinder, which has a variable stroke depending on how much oil is pumped into the middle chamber. It still has the two chambers that a standard hydraulic cylinder has (head end and rod end), but it has a third chamber in the middle, made by a second piston that can "float" up and down the rod. The operator sets the maximum length he wants the rail to be, and then locks off the middle chamber with a hand-operated high-pressure ball valve. Then he can drill in smaller tunnels, and whenever he returns the drifter (percussion drill) to the back of the rail, the rail will never open beyond the length he set it to, due to the reduced stroke of the ram.
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