There are several types of drill bits for different occupations. Workpiece material can also affect the type of drill bit used. Some form of drill bit specific to particular workmanship. The use of each of the following drill
1. The drill large helix (high helix drills): the drill has a large helix angle, thereby increasing the efficiency of cutting, but the trunk is weak. The drill is used to cut soft metal or material having low strength.
2. The drill small helix (low helix drills): a drill bit with a helix angle smaller than the normal size is useful for preventing chisel drill lifted up or held in check the workpiece when making holes in brass material and similar material.
3. Drill bit heavy work (heavy-duty drills): drill bit used to withstand high voltages by way of thickening the web part.
4. Drill bits left hand (left hand drills): standard drill bits can be made also to the drill bit left. Used in the manufacture of a plural hole where the head is designed with a simple drilling machine which allows rotating in opposite directions.
5. Slice drill bit with straight sides (straight flute drills) is an extreme form of a helix drill bit small, is used to make a hole in the brass and the plate.
6. The drill crankshaft (crankshaft drills): drill bit designed specifically to work on the crankshaft, it is very advantageous to make a hole in the resilient material. Having a thick web and helix angles are sometimes larger than the normal size. The drill is a special drill bit that is widely used and become standard drill bits.
7. The drill length (extension drills): This drill has a stem / long shank that has been tempered, used to make holes on the surface that would not normally be able to reach
8. Extra long drill bit (extra-length drills): the drill with a long chisel body, to make a deep hole.
9. The drill-rise (step drills): one or two diameters of drill bit made in the trunk to make a hole with a diameter of terraced.
10. The drill double (subland drills): the same function with the drill-rise. The drill looks like two drills on one stem.
11. Solid carbide bits: to make a small hole in the lightweight alloy material, and the material instead of metal, the shape can be the same as a standard drill. The process of making the holes with the drilling of this there should be no shock loads, because the carbide material easily broken.
12. The drill with carbide inserts (carbide tipped drills): carbide inserts are used to prevent wear and tear due to high cutting speeds. Smaller helix angle and a thin web which is applied to increase the rigidity of the drill bit, which maintain the durability of carbide. The drill is used for hard materials, or non-metallic material is abrasive.
13. The drill holes (oil hole drills): a small hole in the drill chisel blade can be used to drain the lubricant / coolant pressure to the tip of the drill bit. The drill is used to bore holes in the clay material.
The drill flat (flat drills): rod straight and can be grinded edges forming the tip of the drill bit. It will provide a great space for burr without helix section. The drill is used to bore holes in the railroad.