Making a circular cutout in a duct is simple using the techniques shown in photos 5 and 6.
How to use tin snips to cut sheet metal.
Compound snips also called aviation snips are color coded.
The cutters are offset below the handle so you can keep your cutting hand above the work and the compound action allows you to cut thicker material with less effort.
Green snips are designed to cut clockwise curves and red snips to cut counterclockwise curves.
They are essentially metal cutting scissors that are stronger and more durable than standard scissors.
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If you are committed to learning how to cut sheet metal by hand the cheapest solution by far would be using an aviation snip set.
Proceed with the cutting until you complete a circular shape.
I d recommend starting your collection with a pair of offsets click here to see.
Use green snips to cut clockwise and red snips to cut counterclockwise.
Pound the screwdriver at the back with a hammer to allow the tin snips into the metal sheet.
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There are at least a dozen types of tin snips and choosing just the right one can be confusing.
Use curve cutting snips to cut circles.
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Use a screwdriver to punch a hole in the metal sheet.
Tin snips have heavy blades that can cut through thin sheets of metal.
To compensate for how metal may curve or bend cut a strip out where you use red snips for one side and green snips on the other cutting 2 inches at a time on alternating sides so two inches up the right side two inches up the left.
