OK, we tried a couple...it works, but wow, it sounds like a rifle shot. A bit unerving standing close to it, but it punches. It bends the plate right much, but that is just the way it is going to have to be. If my math is correct the machine should have enough guts behind it to do this.
I figured it would take 59.5* tons to punch this using the forumla below. Our Ironworker is a 110/140.
[edited tonnage*-used 65ksi instead of 75ksi]
Slot was also revised to 11/16" x 7/8"...so that helps a bunch
American Punch says to figure the tonnage required, use this:
Constant = 102 for 65ksi, 118 for 75ksi, 134 for 85ksi
Z = Length - Width
A = Width
L = Length
W = Width
Round = Hole size x Material Thickness x Constant = Tonnage Required
Oblong = [(.63 x Z) + W] x Material Thickness x Constant = Tonnage Required
Square = A x Material Thickness x Constant = Tonnage Required
Rectangle = (L + W) x .64 x Material Thickness x Constant = Tonnage required