Cutting Round Holes In Sheet Metal

But when you come to the thicker locking seam you ll need the extra leverage of compound snips.

Cutting round holes in sheet metal.

Punch a hole through the metal using a cold chisel and mallet or drill through with a heavy duty drill. Photo 3 shows how to cut through thick metal. For drilling holes in steel that s 1 8 in. Any tin snips will work for this.

How to cut holes in corrugated steel. In this video we show you the best and safest way to cut a round hole into a can or rectangular duct. When drilling or punching a hole in sheet metal you more or less cut out the entire hole at once. There are two ways to cut round ducts.

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. Or thicker use cutting fluid or a multipurpose oil like 3 in one. Don t say that you were thinking of holding that metal sheet with bare hands. When cutting out a circle one or sometimes two cutting tools are rotated about a center point to.

Use clamps to hold the sheet. You ll need a drill sheet metal snips a start collar. At first locate the center of the. 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.

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. Follow few steps step 1. In response to a question about h. If you are talking about a hole the size of your fist or odd shaped this works pretty well.

First if you want to cut a duct near the middle and use both ends mark and cut the duct before snapping it together. Then use a rotary bit or file or other method to clean it up the edge to your scribe line. Measure from the edges of the sheet metal to the point at which you. 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. For this step you ll need a compass ink and a center punch. Lubricating the bit reduces friction and heat buildup which makes drilling easier and your bits last longer.