How To Drill And Tap Sheet Metal

With a small twist bit 1 16 in. For the cleanest hole clamp a second piece on top of the metal making a sacrificial sandwich. In general it s a good idea to drill through metal using as slow a speed as possible using a drill bit for metal.

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Align the tap with the drilled hole in the metal.

How to drill and tap sheet metal.

To setup the punch first drill a pilot hole into a piece of sheet metal with a step drill bit. To 3 16 in you can drill through most metals at 3 000 rpm. Hard metals like steel and larger drill bits require even slower speeds. When drilling thin sheet metal clamp the metal over a piece of sacrificial plywood or other flat sheet good like mdf or particleboard to help prevent the bit from tearing up the hole.

A draw stud punch and die. Coat the tap with cutting and tapping fluid. There is nothing more aggravating when you just don t know what size drill bit to use for a pilot. Start threading the hole in the metal by turning the tee handle tap wrench clockwise for a right hand threaded hole or counter clockwise for a left hand threaded hole.

However there are times when sheet metal screws are required. A knockout punch consists of three parts. Make a dimple drill bits can be reluctant about metal. Place the die over the draw.

To help my readers out i thought i would add this quick reference chart. This should help whenever you run into a situation you need to drill a pilot hole and are not sure the size bit. Place a bit of fluid on in the hole to be tapped.

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