The harder the metal you're drilling into, the larger the point angle (and therefore, the flatter the point) you'll need. They can have two, three or four cutting lips – the more cutting lips there are, the harder the material it will cut into. However, these types of bits often leave a sharp edge and a poor-quality finish when drilling through plastic, because they’re designed to bite into the material. Those types of pressed wood boards are not very strong, and the screws of butt hinges tend to pull out.

To solve this problem, solid tungsten carbide twist bits, which drill quickly through the board while providing a moderately long life, are almost always used. Even though wood bits are available in various colors, you will mainly find black and silvery units. It’s also crucial that you use a drill bit designed for plastic, given how difficult it can be to create a clean hole using any other type of bit.A center drill bit frequently provides a reasonable starting point as it is short and therefore has a reduced tendency to wander when drilling is started. TiAIM: a titanium aluminium nitrate coating that increases resistance to abrasion and heat on drill bits designed to cut metal. A brad point drill bit is the perfect tool for drilling in softwood, plastic, and hardwood materials.

The transition between this ground diameter and the original diameter is either straight, to form a counterbore, or angled, to form a countersink. Modern spoon bits are made of hand-forged carbon steel, carefully heat-treated and then hand ground to a fine edge. They also come with rubber stoppers which allow you to set how deep you want to drill into the wood.Turn on the grinder and hold the worst drill bits against the coarse wheel first before graduating to the finer wheel. Replacing dull drill bits can be expensive, so it is worth getting as much use from them as possible. Drill bit sets are available in various combinations, including multi-purpose drill bit sets, drill bit sets for specific materials and drills, and those for specific uses. A more aggressive angle, such as 90 degrees, is suited for very soft plastics and other materials; it would wear rapidly in hard materials.