Questions about hydraulics need help.

[Mad Matt]

Ok so I use a press that I built to rough shape shield bosses. I'd been using a 30 ton air hydraulic bottle jack which probably actually puts out 50 tons. the frame is plenty strong for 50.

Trouble is the jack kinda blew up. I want to replace it since I think I'll probably keep doing bosses. The jack I have now isn't available any more. I found a 50 ton jack online but with shipping it's a little over $500 CDN. I figure if I go with a 50 ton jack this one won't blow up on me.

Is there a cheaper way to do this? I don't know anything about hydraulics. I've got a big compressor it'll put out 130psi at 10cfm. Can I use that to run a hydraulic pump? And then how do I figure out what kind of cylinder I need to push 50 tons. What else do I need to put it together. And can I do it cheaper then the $500 (I can find that out myself princess auto has tons of hydraulic stuff).

I want something that will start at 10-11" and max out at 16" 18 at the most.

Cylinders all just say psi and have the diameter and length. I have no idea how this works out to overall pressure.

Kinda hoping this route will move faster then the jack too but that's not really that big of an issue.

[InsaneIrish]

edited because I think what you are talking about is an Air over Hydraulic press correct?

[Halberds]

Area of piston X pressure applied = force in PSI
Subtract the rod area for the return force.

[Mad Matt]

Ok I'm too dumb even for that halberds. What's return force? There's springs to pull the cylinder back up if it's not applying pressure.

A grocery list of what I need would be really really great.

Irish yeah that's what I mean I think. Here's a link to the 50 ton jack. The 30 ton one I had just barely put out enough pressure.

http://cgi.ebay.ca/Troy-50-Ton-Air-Hydr ... 1262#about

I have discovered that the local contractor rental supply place rents 50 ton bottle jacks but not sure if they're air powered hydraulic jacks or hand pump ones. I can press about 16 in an hour so renting one for a day here and there might work out.

[Mad Matt]

Ok I found this it says it's for building a 50 ton press. Looks like it'll be cheaper to just buy the jack.

• For building a 50 ton press
• 6" bore, 10" stroke
• 2" shaft
• Base pineye width: 6-5/8", pinhole dia.: 1-1/4"
• 3,600 PSI max. continuous pressure
1200083 – Wt. 80.3 lbs. . . . . . . . . . . . . . . . . 439.99

[Halberds]

The Troy 50 ton air/hydraulic is probably your best bet.