Use a hydraulic press to gradually and smoothly increase pressure until the broach is forced through.
Making a sqaure hole sheet metal.
Next use a compass to outline the edge of the hole.
Now it s time to use that center punch.
Making a square hole in a plough blade.
Insert the broach and ensure it lines up at 90 degrees from the work peice or the hole will be crooked.
Use your center punch to strike at the center of the hole.
How to use chisels instead of files to cut a share hole for carriage bolts.
Drill a hole in the metal close to but smaller than the finished hole size.
How to make a square hole without using special tools.
Go slow and drill a smaller hole first ti guide the bigger rill bit.
Blacksmithing for beginners cutting a square hole in sheet metal.
Ensure you fix the metal sheet down when you drill do not hold in you hand.
If the hole is a lot bigger then your biggest drill bit then drilling holes round the edge of the square and then connecting them with a saw is the best way for you.