Cutting Round Holes In Sheet Metal

There are two ways to cut round ducts.

Cutting round holes in sheet metal.

When drilling or punching a hole in sheet metal you more or less cut out the entire hole at once. Then use a rotary bit or file or other method to clean it up the edge to your scribe line. 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. Photo 3 shows how to cut through thick metal.

Or thicker use cutting fluid or a multipurpose oil like 3 in one. First if you want to cut a duct near the middle and use both ends mark and cut the duct before snapping it together. Measure from the edges of the sheet metal to the point at which you. You ll need a drill sheet metal snips a start collar.

How to cut holes in corrugated steel. When cutting out a circle one or sometimes two cutting tools are rotated about a center point to. Lubricating the bit reduces friction and heat buildup which makes drilling easier and your bits last longer. For drilling holes in steel that s 1 8 in.

Don t say that you were thinking of holding that metal sheet with bare hands. Use clamps to hold the sheet. 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. For this step you ll need a compass ink and a center punch.

Be that as it may here is a neat idea from flyboy accessories for cutting larger holes 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. If you are talking about a hole the size of your fist or odd shaped this works pretty well. Punch a hole through the metal using a cold chisel and mallet or drill through with a heavy duty drill.

Follow few steps step 1. Create a paper pattern of the size and shape of hole you wish to cut. 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. For easier to drill metals like aluminum brass or cast iron lubrication isn t usually necessary.

How to cut a round hole in sheet metal. In response to a question about h. 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.