![]() You'd have to make a super beefy frame but steel is cheap and easy to come by, big hydraulic cylinders are not. Have you considered a smaller cylinder with alonger stroke attached to some kind of mechanical advantage, like a first class lever? Alla Ironworker? Hoss Haley built a 100 ton + press with a 3" loooong stroke cylinder by putting the cylinder at the end of a proportionately long lever, and I have it on good authority that thing moves pretty quick ( my friend mike worked with hoss for a few months)He doesn't forge with it but mostly because he doesn't have to. Unfortunately, unless a deal floats along in front of my face, I don't think I'm likely to build a press all that soon - got way too much other stuff happening right now. All this is a moot point, because the 2 hp unit will be too small, but in any case, in a nutshell, is that how it will work? But, correct me if I'm wrong, if you take a pump and cylinder setup which is running a larger bore cylinder, and then take off the large cylinder and put on a smaller bore one, all other things remaining the same, it will move the smaller bore cylinder faster, correct? Or not? If that is how it works, then you could keep getting a smaller bore cylinder, until you got one which moved fast enough, and then see if it produced enough tonnage (all mathematically of course, if you had all the numbers). Macbruce - I guess I should rephrase my above post to state, "smaller bore cylinder" everywhere instead of just my arbitrary 20 ton number. Once I get the book and crunch numbers I'm sure I'll get a better understanding of what I need. Thanks for the info fellas - I'll hold off on this unit. even more than most projects - I've always been like that for some reason. I realize I could just spend my time swinging a hammer and learning more, but I think I enjoy building tools, jigs, fixtures etc. Any thoughts? The seller is trying to contact the manufacturer of the pump to find out it's flow rates - short of that, is there any convenient method of finding flow? Just plumb it, and put the outfeed tube into a bucket and see how long it takes to fill up a gallon? I am pretty new to the trade, and am mostly working on small stuff right now, so I think a 20 ton would be pretty handy. I ordered the James Batson book, but don't have it yet. I'm wondering if I can use it for a smaller, say 20 ton press, if it will move the ram fast enough and have enough power. He doesn't have the flow rates of the pump, but says it originally came off a 40 ton press. A guy is selling a motor/pump unit on my local craigslist for what seems like a reasonable price, and I think he'll come down. ![]()
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