Drills are used in many situations in life or work,such as home decoration, carpentry work, and the production of large-scale machinery. Of course, we have to deal with different materials and we have to choose different drills. Different surface treatments and different materials will affect the use of drill bits.

MATERIAL AND SURFACE TREATMENT

The drill bit is generally divided into two parts,the handle and the head; the handles have different shapes so that they can betightly connected with the adapter for easy work. Generally, the handle can bemade of carbon steel or high-speed steel; while the head is the main working part, which requires higher materials, generally high-speed steel and hardalloy can be used。High speed steel is the general purpose tool and fits many short run and maintenance jobs. Cobalt twist drills provide longer life and can be run at higher speeds, while carbide drills are the choice when conditions of speed, feed and rigidity are optimum.Coatings can add life to all of these tools.

Light-duty drillings working will use some high-speed steel drill bits; such as wood and light metal, etc.; in addition,there are cobalt-containing drill bits and cemented carbide drill bits. This material can make the drill bit more wear-resistant and sharper. It is suitable for Drilling and industrial manufacturing

The quality of uncoated drill bits is poor; black oxidecoating and titanium coating (titanium nitride, titanium carbo-nitride,aluminum titanium nitride), these surface treatments on the drill bit canprevent the drill bit from rusting, reduce friction and work loss. Bright finish, black oxide, titanium nitride, titanium carbo-nitride, titanium aluminum nitride.

THE TYPES OF DRILLS

STEP DRILLS

If you often need to drill holes in the metalsector, you definitely need a step drill, which can drill holes of different aperture sizes as needed. Step drills have straight grooves, spiral grooves,and arc grooves. Of course, according to their blades, they can also be divided into single-edged, double-edged, three-edged, four-edged and multi-edged stepdrills. Step drills also have different surface treatments, including: Bright surface, Nitrided coating, TiN coating, Amber and black, Cobalt coating, Blue coating, Aluminum oxynitride；Different coatings make the quality of the stepdrill better, not easy to rust, or make it more beautiful.

CONICAL DRILLS

Use in industrial power tools for the rapid drilling holes in thin materials including sheet steel up to 2mm thick, alloy sand plastic.

TWIST DRILLS

Twist drills are used for boring holes quickly, clean, and of accurate size. Its shape is named after the twist, and this shapeis conducive to expelling the chips produced by punching. The process is rolling or grinding, and the quality of the grinding is better. Usually the twist drill is made of high-speed steel.

CENTER DRILLS

The center drill is used for the prefabricated precise positioning of the hole processing, and guides the twist drill toperform the hole processing to reduce the error. It is also known as a combination drill. On both its ends a cutting point is made and its middle portion is plaint.

CARBIDE BURRS

Carbide rotary burrs can process metals such ascast iron, cast steel, carbon steel, alloy steel, stainless steel, copper,aluminum, and non-metals such as marble, jade, and bone; it can basically replace small grinding wheels with handles and is free of dust Pollution, high production efficiency and long service life. Its head has a variety of shapes,which can be used for polishing of various shapes and materials, and can berefined.

WOOD WORKING DRILLS

It ldeal for cabinetry and furniture in woodworking. Drilling accurate and clean holes. Extra wide flutes for fast wood chip removal.

WOOD FLAT DRILLS

This type of drill is generally made by beatingslender sticks of high carbon steel. Their cutting edge is ground and then hardened and tempered. It can be made easily in any shape or size. These are made in different sizes after forging them. These drills are very cheap.

AUGER DRILL BITS

If you want to drill a hole on thick and dry wood,you can make it using an auger drill bit. It makes a hole in the woods very easily, so you don’t have to apply as much pressure. These have a screw tip thatcauses the hole and helps to pull out the bit, creating a clean hole. Single wing cutting edge makes faster, discharging quicker, smoother while indrilling. The drilling is accurate, simple, quick and easy. Hexagon auger bit

MASONRY DRILL BITS

Construction drills are used to drill masonry and concrete; although construction drills are made of strong materials, they needto be replaced regularly because the materials handled are also hard and easyto wear.

GLASS DRILL BITS

This type of drill bit is used for drilling through glass, plastic, composite, brick, marble, and hollow brick. It has greater resistance to high temperatures.

COUNTERSINK BITS

90° point angle, Morse taper shank. Use for steel,cast iron, non-ferrous and light metals. Use on plastics and metal hardened cutting edge. Flute designed for smooth cut.