Cutting Round Holes In Sheet Metal

There are two ways to cut round ducts.

Cutting round holes in sheet metal.

Lubricating the bit reduces friction and heat buildup which makes drilling easier and your bits last longer. Any tin snips will work for this. When cutting out a circle one or sometimes two cutting tools are rotated about a center point to. You ll need a drill sheet metal snips a start collar.

At first locate the center of the. I guess i ve got holes on the brain lately as i am finishing up the hole wizard for the g wizard conversational cnc product. Measure from the edges of the sheet metal to the point at which you. Don t say that you were thinking of holding that metal sheet with bare hands.

How to cut a round hole in sheet metal. In this video we show you the best and safest way to cut a round hole into a can or rectangular duct. For this step you ll need a compass ink and a center punch. In response to a question about h.

When drilling or punching a hole in sheet metal you more or less cut out the entire hole at once. Or thicker use cutting fluid or a multipurpose oil like 3 in one. For drilling holes in steel that s 1 8 in. Follow few steps step 1.

All you do is use a normal drill bit 125 or so and drill a series of holes right next to each other like a chain inside of your scribed line. Create a paper pattern of the size and shape of hole you wish to cut. Depends on how big a hole you are talking about but there is a technique they tought us i am an aircraft structural repair guy called chain drilling. First if you want to cut a duct near the middle and use both ends mark and cut the duct before snapping it together.

But when you come to the thicker locking seam you ll need the extra leverage of compound snips. Photo 3 shows how to cut through thick metal. Then use a rotary bit or file or other method to clean it up the edge to your scribe line. It s meant for creating lightening holes of the type seen when building aircraft or maybe just toolboxes and furniture that are built like wwii fighter planes.

If you are talking about a hole the size of your fist or odd shaped this works pretty well. Use clamps to hold the sheet. Punch a hole through the metal using a cold chisel and mallet or drill through with a heavy duty drill.