Cutting Large Circles In Sheet Metal

In response to a question about h.

Cutting large circles in sheet metal.

Hot metal chips will fly everywhere. It is easy to cut holes in sheet metal with a plasma cutter with circle attachment and to work off of a center punch mark. Thick using a ferrous metal cutting blade. In our test it cut through rebar like a hot knife through butter.

Cut metal with your circular saw. When drilling or punching a hole in sheet metal you more or less cut out the entire hole at once. Put your ink to the use and mark the hole center. Metal sheet nibbler cutter double head with circle cutting accessories drill attachment with wrench parts hole straight curve circle cutting metal shears 4 3 out of 5 stars 4 29 99 29.

Typically the hole is large and the sheet metal won t fit on my cnc milling machine so i m left flailing. Next use a compass to outline the edge of the hole. Use your center punch to strike at the center of the hole. The edge will be a little rough though.

It may not be an obvious choice but fitted with the right blade a circular saw is a great metal cutting tool. This will create dimples in the sheet. At first locate the center of the whole. I ve messed with trepanning tools abrasive wheels hole saws and all manner of other stuff for cutting large holes in sheet metal.

Now it s time to use that center punch. With this tool you stick an endmill in a die.