How To Countersink Screws In Light Aluminum Sheet

Drill the countersink hole at the marked spot. You need a suitable countersink to countersink screws. After drilling a hole in the table for the screw you will be using and the matching hole in the sheet metal use this punch to make a depression in the sheet metal so the screw head sits below the surface of the sheet metal.

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Use a cutter that matches the numbered size of your screw which is usually 6 8 or 10.

How to countersink screws in light aluminum sheet.

Countersinks have a countersink angle of 90 and for us standard 82 for countersinking screws e g. For the flat countersink the countersink angle is 180. Slide the screw into the countersunk hole and run your hand over the surface of the metal across the countersunk hole to feel whether the head of the screw protrudes above the surface of the metal. The countersink angle for rivets is 120.

Start the drill off at a faster speed to sink the bit cleanly then slow it down to make the countersink. No c sink needed no metal removed from the sheet metal and more strength at the area of the screw head. Secure a fluted countersink cutter in your drill that s the same size as your screw. A fluted countersink cutter has a wider base that comes to a point and contains multiple cutting edges so you can make larger holes for the screw s head.

Line up the tip of the drill bit with the mark you made earlier. Drilling the countersink hole too fast can produce tear out or make it too deep. Countersunk screw in through hole.

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