dave wrote:
I need to make a piece of sheet steel .250 thick, roughly postcard
sized, with a square-edged "through-slot" (perforation) in the center of
it approx .0625 wide by .750 long. in my shop, the easiest way would be
to weld two pieces together at both ends, grind flush, and leave the
slot 'open' in the center.

thanks guys for tips and ideas :-)

toolie

I would use a hacksaw blade to clean up the ends of the slot. Or maybe
stack two blades to get more width.

Dan