dcr135
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Posts posted by dcr135
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Eddie, I picked a single stage vane pump for two reasons. 1) They are supposedly much quieter than a log splitter type gear pump.
And 2) A 6 gpm pump gives me the same speed after contact w/ the work piece as a 28 gpm two stage pump. The 28 gpm gives a quick approach speed but slows down to 1/4 of that once your pump switches to the high pressure mode. My press only has a max of 8 inches of travel so a fast approach speed would be of little value. I wanted speed after contact with the dies was made.
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Alan, yes I definitely need to reverse the hoses between the valve and cylinder. Thanks.
Pike3e, thanks. Not yet but I'll post when I do.
Flemish, the press weighs a bit over 200 pounds with the cylinder.
Thanks Gehljoe. I took about 2 years to read up on hydraulics, draw lots of sketches, and collect the parts little by little. I rummaged for scrap steel & bargain shopped all the parts except for the hoses and fittings. I probably have $800 or so in it. The build itself wasn't too bad and could be done in two or three weekends.
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Reading this forum was very helpful in getting ideas for building my own press so I thought I'd show what I came up with. Since my space is limited I wanted something with a small footprint. I ended up with a benchtop forging press that suits my Damascus steel making needs perfectly.
After lots of research I decided to focus on speed rather than tonnage. The result was a 19 ton press using a 4" cylinder with 2.25" ram. To keep noise to a minimum the motor & pump assembly are mounted independent of the press. I also mounted the pump on a shop built bracket made from 1" steel plate to reduce vibration. Power comes from a 7.5 hp electric motor driving a single speed 6 gpm vane pump. Ram speed is ~2" per second. I'm currently running the press at under 1500 psi and making ~12 tons which (to my surprise) has been plenty for my initial 6x2x3 billets.
Here's a very brief action video.
https://www.youtube.com/watch?v=RUUsILQZq4s
The design is pretty self explanatory but any questions are welcome.
Thanks for looking,
D. Crawford
Benchtop Hydraulic Press
in Presses
Posted
Iron dwarf, I was a bit disappointed with the noise level of the vane pump. What type of pump are you using. Have a pic?
Here's mine