Pounds of force, not psi
And yea your numbers are spot on- thats the kind of force I would expect if I was going to try to shear it with a punch / die arraingement, although even then, this is pretty soft stuff.
4230 lbs I think would flatten one of these dies.
Thats what I was hoping to hear, makes my life cheaper and easier. I just need to call around on tuesday for a diemaker locally. There are lots of internet guys too but local would be nice.
Sounds like I'm on the right track now, I probably just need to modify this press a bit so that I have a larger flat work surface to make my life easy- need to punch about 250 of these, plus another 500 thin rectangles for the top / bottom of the box.