Hydraulic press hand pump

I am at the moment collecting the bits and pieces to make a 10-ton hydraulic bench press.

I have a 10-ton ram and have been given a porta power type hand pump it looks like a 4-ton type.

Apart from the shorter handle and reduced length tubular oil tank the pump dimensions seem the same as my friends 10 ton hand pump.

There is a pressure release valve on mine but have had a reading over 4000 psi on a gauge fitted just to the pump body but it was hard with the short handle.

Apart from the hydraulic ram diameters and shorter handle on the pump what could be the difference between a 10-ton and 4-ton hand pump.

Both types have similar diameter hand pump plunger.

If suitable I would fit a longer handle and oil tank body.

Edited By Windy on 29/07/2012 15:08:54

Hi Windy

If the gage is correct the pump delivers 4000 PSI of oil pressure

The diameter of your 10 ton ram piston determines the actual pressure on your press you will get.

The area of a circle is   PI R^2   [There are free calculators on the net just type "area of a circle"]

Once you know the area in square inches of the 10 ton ram piston, you can calculate the pressure you will get on your press By multiplying the square inches of area on your 10 ton ram piston by 4000 that will give the total pounds force.

However there are losses from friction so the actual force will be a little less.

Cheers

John

Edited By John McNamara on 30/07/2012 14:07:03

Hi Windy,

My enerpac hand pump goes to 10000psi700 bar and with the 10T ram fitted will generate 10T force max. I have made a set of bending dies for bending flat bar, and it makes bending 50x12mm black steel bar really easy - also the force required is only about 1.5T for this size. I have a hydraulic pipe bender that can bend up to 2"nb pipe and this used a 12T ram/combined hand pump unit. I believe these tubela pipe benders can bend up to 3" pipe with the right formers.

Neil.

Hi Neil,

What you have done is similar to what I will be doing.

I have a 1/2-ton arbour press that has a 6" die block that is used for bending sheet metal and has been very useful but has limitations.

I made some dies for drawing my turbine cases and used my friend’s 10-ton press for the job but it involves some travelling to use it so decided to make my own press.

My local scrap yard will be having some visits soon to get the required frame material.

Windy