Put your ink to the use and mark the hole center.
Making a sqaure hole sheet metal.
Go slow and drill a smaller hole first ti guide the bigger rill bit.
Insert the broach and ensure it lines up at 90 degrees from the work peice or the hole will be crooked.
How to use chisels instead of files to cut a share hole for carriage bolts.
Next use a compass to outline the edge of the hole.
Now it s time to use that center punch.
This will create dimples in the sheet.
Use a hydraulic press to gradually and smoothly increase pressure until the broach is forced through.
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.
How to make a square hole without using special tools.
Drill a hole in the metal close to but smaller than the finished hole size.