Making a circular cutout in a duct is simple using the techniques shown in photos 5 and 6.
How to cut thin sheet metal straight.
How to cut sheet metal method 1 of 4.
Use curve cutting snips to cut circles.
Making detailed cuts with.
Wax your saw blade before cutting sheet metal.
Pound on the back of the screwdriver with a hammer to puncture the metal and create an opening for the tin snips.
Using tin snips for thin sheets.
Mark on your stainless steel sheet with a permanent marker or metal scribe where you want to make the cut.
Cutting straight lines with an electric saw.
Punch a starter hole for a circular cutout with a straight blade screwdriver.
Step 3 place the edge of the stainless steel all the way inside the jaws of the snips and cut along the line that you marked.
Choose between red blue or yellow snips based on the cut direction.