how to build a hydraulic press?

[wrenchbender]

will be building a hydraulic press.
using a hydraulic cylinder that i've acquired.
it's from a back hoe boom
the dimensions are 60" stroke 5" or 5.5" piston. and the rod is 2.75"
i believe the machine had a working pressure of 2500 psi
the Questions i have are
what force will it produce at 2500 psi.
second how heavy should the frame work be
third i would like it to be a c frame

[AussieChris]

With a 5" piston, with pressure on the piston side it will develop 49087lbs (22 ton) of force at 2500psi
If the piston is 5 1/2" it will be 59396lbs (26 ton) at 2500psi

See http://www.engineeringtoolbox.com/hy...or-d_1369.html

Chris
Brisbane Australia.

[ADGO_Racing]

5.0" bore will make 49,087 pounds of force (Just under 25 tons)on the side opposite the piston rod.

5.5" bore = 59,395 or just under 30 tons.

[Doozer]

The stroke is really too long to be useful, unless you want to pull broaches. Perhaps you could cut it down.

--Doozer

[KINGWELD]

60 inch stroke??? Got something that needs to be pressed over in the next
county?
Seriously, you might want to consider a ram in the 15 to 20 inch range as
hydraulic shifts will bend when side loading occurs which is easy to do in
a press application( big bucks to get straightened also).
Just a thought. Have fun and be safe.

[gwilson]

I made a very effective press with a 50 ton bottle jack from Northern. It will put out enough force to coin things from silver the size of a 50 cent piece,if I press,anneal,and press again. I now have a 100 ton Enerpac,but need a separate pump and reservoir for it.

[winchman]

You can buy a pretty decent 20-ton press at Harbor Freight for less than $150. My friend got his for $137 by using a coupon off the website in conjunction with a 20%-off store coupon. You can't even start to buy the materials to build one for that money.

http://www.harborfreight.com/20-ton-...ess-32879.html



The plates shown in the ad aren't what comes with the press. His came with larger plates with several Vs in them. They're the ones shown in this ad.

[wrenchbender]

ok cutting it dn. to a 24" isn't a big deal. i am quite proficient in the welding field. i am certified in structural welding all position with 7018 ac rod and iron core mig. the reference was just an over statement on my part. the real question was and i most likely failed to articulate the metal requirement to build a adequate c frame and how much tonnage the piston will produce at my given pressure. i will build it as a c frame, i was just hoping for a consensus of sizes of the materiel required to build a sturdy unit.
this is my thought. what do you guys think?

1" plate cut down to a 6" cross section for the sides of the c frame
for the inside and out side of the c frame i can have a shop role a1" X 6" flat bar
and for the welding it is quite simple tack it together and then preheat it to 250 deg. F. with a good hard wood fire. and then lay the wire and wire to it.

since i am not an engineer the overbuild it is my montra.

i own all but the 1" sheet of metal. and hoses.
pump, ram, control valve, drive motor 1 x 6 flat bar are all under control in my humble shed.

[MTNGUN]

how heavy should the frame work be
third i would like it to be a c frame

A c-frame will be springy.

The design process will be fairly complicated for a c-frame. Several hours, if not days, engineering work.

Do you really need a 60" stroke ? Because if not, you can buy a standard 20 ton press for less than you can build one.