Hydraulics Question

W

Will Leavitt

Joined
Jul 28, 2006
Messages
3,953
Friend asked me this hydraulics question and I don't know squat 'bout them cept not to get my finger between moving parts.

It's going to be a table top model, but I want 15+ tons out of it.
What I need is to know what size cylinder I would need if I am using a 3hp 220v single phase motor turning 3450rpm. I want the stroke to move 1 inch per second. I believe it should be around 2200psi@ 3.4gph, but I am not sure?
Do you know anyone who knows hydraulics?

Please help me help him lol :D
 
I have a a motor on my press just like your description. I have a 11 gpm pump with a 4 1/2" cylinder and it moves at 2" per second at 2000 psi.
 
You control the stroke speed with a flow control in the pressure side line to get the speed you want. As to the pressure at the rod, that is found by multiplying the square inches of the piston's surface by the PSI of the pump. It is HIGHLY recommended to have gages in line to monitor the pressure you are operating at and to make the necessary adjustments to the pump to ensure safe operation...
 
The FORCE at the rod would be the PRESSURE (psi) multiplied by the AREA (of the piston surface).

Pounds = Pounds/square inch * square inches.
 
The formula for calculating the electric HP is:
Motor HP = pressureXGPM/1550, but that is only one of several calculations.

I will save you the long math and several tables:
A 3HP electric motor , operating at 3450 RPM,will operate a 11 GPM pump with a 4" cylinder at 15 tons, at 3 IPS, developing 2000PSI loaded, and 500 PSI unloaded. A 5" cylinder will operate at about 2 IPS. ( these are rounded off numbers)
Stacy
 
how many tons would some one need to squish down 2in round stock to get it into hand forgable size.
 
2 inch round is hand forgeable size.:D Just need arms like popeye and a 6lb hammer:eek:. As far as a press goes 15-20ton will perform really nice.
 
i have the hammer just not the arms :). what i was thinking is just a hand powered 20 ton unit in a small frame. just used to flatten out some round so i could cut it into strips.
 
JTknives said:
i have the hammer just not the arms :). what i was thinking is just a hand powered 20 ton unit in a small frame. just used to flatten out some round so i could cut it into strips.
Click to expand...

JT, A hand pump jack style press will not be fast enough. You could try it but when I did by the time the press was in contact with the material I only had 2 seconds before things were too cold. A 2.5 lb hammer would work better. How about slicing a piece off and forging that?? Like Don Hansen III had mentioned on one of his posts a 1/2" piece of 2"dia would make a pretty nice size hunter utility.
 
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