as far as the hydraulics go , build it to 20% more than ever needed . or more . have a safety cushion . as the diameter of the ram goes up your working pressure will drop . go big . love to see this done . hope you do it .
Hmmm... I thought it wouldn't matter what size the system is.. since fluid doesn't compress, the pressure should remain the same no matter how large the cylinder is.. provided the reservoir doesn't run out of fluid.
I would think that, all things being equal, a larger cylinder just allows you to attain a higher capacity (in lbs of "push") at the same hydraulic pressure.
I read the manual on the hydraulic power unit I want to buy. The unit will produce 2000psi.
The 5" diameter cylinder has an area of 19.625sqin (radius x radius x pie.... 2.5"x2.5"x3.14=19.625")
Multiply that 19.625 by 2000psi and I should get 39,250lbs of push from that cylinder.
Using a 3:1 ratio in those arms, I'm looking at 3x39,250=117,750lbs of force pushing down at the end of those arms.
Add the shackles at the bottom and as those shackles approach "overcenter" they'll compound that force even more. So, I should easily be up in the 60 ton+ range with that setup.
To "air bend" 3/16" material in a 1.5" die, I need 11.2 tons per linear foot. So.. for 48", I'll need 44.8 tons.
To "air bend" 1/4" material in a 2" die, I need 15.3 tons per linear foot.
So.. for 48", I'll need 61.2 tons.