Сверло является тем самым универсальным tool, without which it can not do even one, even the simplest repair. It should be remembered that for each material there is a specific type of drill.
The main thing is to remember that the cutting toolmust be harder than what needs to be processed. Depending on the material in which they are going to drill a hole, there are drills for wood, for metal and for concrete. There are also drills for glass as well as tile. Naturally, in each case the appropriate tool is used. Regardless of the purpose, each drill has: a shank, working and cutting parts, elements for chip removal.
What are wood drills
Wood is a fibrousmaterial, and therefore in order to grind a hole in it, special drills for wood, having a special shape, are necessary. There are a lot of them, but most often they use the following:
- Spiral. Designed for drilling holes, usually from 3 to 52 mm. At the end of such a drill there is a special edge designed for ease of operation.
- Feather.It is used for drilling of not very thick boards, as well as hardboard and chipboard. Such a drill does not have chip removal, and therefore using it to make deep holes is not very convenient. In order not to buy the whole set, you can purchase a feather drill for wood (adjustable). The diameter of such a drill can vary from 15 to 76 mm.
- Forstner drill bit. It is used for drilling blind holes. It allows you to make the hole below the flat, smooth and smooth. Usually has a diameter of 10 to 50 mm.
- Crown drill in wood.It is used for drilling large holes, which can not handle the usual drill. Outwardly, it is a ring with teeth, in the middle of which there is a centering drill. A few pieces are usually sold in a set with a diameter of 19 to 127 mm. The depth of the drill bit is limited, as a rule, it is 22 mm. There are models with a depth of drilling up to 64 mm. This drill can also make holes in plastic or drywall.
- Drill cutter.Used for holes of complex shape, for example, to create roundings. The cutting part of the drill-milling cutter is located in the center, and therefore it is necessary to first drill and then move to the side.
Recommendations for choosing a drill
Choosing any tool, not only drill bytree, the first thing you need to pay attention - appearance. A quality product in no case should not have visible external defects (chips, scratches, dents). Cutting edges should have a uniform color and be well sharpened along the entire length.
The next thing you need to pay attention to is the color of the drill. It is this feature that will help determine what kind of finishing it has been subjected to. So, what can the color of the drill tell us?
- Steel gray. No processing was performed.
- The black. To increase the strength of the drill was subjected to treatment with superheated steam.
- Golden. This means that the drill has been specially processed to relieve internal stresses of the material.
- Bright golden. It means that the surface of this tool is covered with a layer of titanium nitride, which should make it stronger and prolong its service life.
Choosing a drill, you must pay specialattention to the manufacturer. It is better to purchase products from well-known companies. This will help to get not only a quality product, but also to avoid unnecessary waste of money.
