If you need to make a hole that’s larger than 1 inch (2. 5 cm), get a hole saw attachment for your drill instead. Try a cone-shaped step bit if you’re working with thin sheet metal. Step bits also let you drill multiple sizes of holes without changing the bit. A drill press will give you the most power to cut through the thickest metals, and you may be able to use one at a community workshop in your area.
Wear a long-sleeved shirt with a closed collar to protect your arms and body too.
If you’re drilling a hole through thin sheet metal, sandwich it between 2 pieces of plywood so the edges stay flat and smooth.
In a pinch, you can use a nail instead of a center punch.
Cutting oil also helps keep your drill bit sharp so it doesn’t dull as fast. [7] X Research source
You can use drill bits smaller than 1⁄16 inch (1. 6 mm) up to a speed of 3,000 RPM. If you’re working with a drill bit that’s larger than 1⁄2 inch (1. 3 cm), keep it around 1,000–1,500 RPM. [9] X Research source If you’re trying to drill a large hole in thick metal, start with a 1⁄4 in (0. 64 cm) bit to make a pilot hole since it’ll be easier to cut out. Then, change the drill bit to the next size larger and drill through the hole again to widen it out.
Collect metal shavings in a plastic bucket with a lid to recycle or take to a scrapyard. [13] X Research source
