hydraulic info

"bruce lazer yahoo.com>" Can someone recommendation a hydraulic pump for a arbor press I'm

You'll find the 13.6gpm pump works fine at 1750 with a 4" cylinder. Travel time will be OK, and you'll still be able to get up to about 1400-1500psi on the second stage.

Likely, you'll not need more than 1500*12.56 pounds (9.4 tons) of actual force for most pressing jobs.

I tell you this, because I built a press with the Northern Hydraulics parts you called out. Works fine.

LLoyd

Here are the tools to figure it out for yourself.

Basically you need to determine how much hp it requires achieve the desired pressure and what the rate of advance is of a given cylinder supplied by what ever GPM pump.

One thing to consider, rapid advance and high pressure can be achieved without a lot of horsepower but then you need a two stage pump with an unloader circuit. Probably more complicated than you need for an arbor press.

For sizing lines, figuring 5-10 feet per second fluid flow seems to work out fine. A gallon is 231 cubic inches.

Wes

The 13.6gpm Barnes pump he called out is a two-stage unit with automatic unloader. It will give the desired travel time at no load, then switch to the small displacement circuit for high pressure.

I added an adjustable relief valve to mine to limit the top-end pressure.

LLoyd

Thanks for the help. Its looks like if stay around 3gpm or less on the second stage it will be OK. I wasn't sure how the motor rpm figured into all this. I going to be direct drive.