Use the right Drill Bit
With so many different makes and types of drill bits to choose from, it can be confusing to know which one you need for the project at hand. Here's a quick rundown of the various types of drill bits.
HSS or Twists Bits
These have a cone-shaped cutting point and spiral shaft. Made from high-speed steel (HSS), they’re suitable for drilling into most materials including timber, metal, plastic and steel.
Brad Point or Wood Bits
Used for woodworking, the sharp point is ideal for getting the hole positioned accurately and the outer spurs cut a clean hole.
Masonry bits are characterised by the hardened tungsten carbide point on the tip that simultaneously pounds and twists into hard masonry surfaces when the drill is set to hammer mode. Drill into softer masonry surfaces, such as old brick or cement render, without hammer action, on a slow speed.
Multi-Purpose Drill Bits
Similar in design to masonry bit, Alpen multi-purpose bits are manufactured for rotary drilling into tiles, masonry, metal, wood or plastic and are ideal for drilling one hole through different materials. Use in non-hammer mode with a slow speed. While more expensive that standard bits, tungsten carbide multi-purpose bits allow you to drill through a variety of materials without having to change the bit.
Glass or Tile Bits
Glass or tile bits have a tungsten carbide tip that ensures a longer life when cutting into glass or tile. The best method of drilling is to use at slow speed with coolant. These bits make cutting into glass or tile far easier than conventional drill bits. Place the tile or glass on a level surface and allow sufficient clearance for the spear tip.
New drills have keyless chucks, so bits can be changed by simply turning the chuck. Older drills have keyed chucks, requiring a key to loosen or tighten the jaws. A handy quick-change fits into any existing chuck for specially designed drill bits with a hexagonal end to be snapped in and out.