Twist drill bit can not drill wall tiles. With tiles on the eye generally have three kinds of drill, one of the simplest is made of carbide similar to the triangular piece after adding a shank cone drill, this drill is convenient in the glazed ceramic tile drilling precise positioning of the hole. The second is often referred to as a wet drill, a kind of sintered carbide with a slit in the head of the stick (tube) shape (hit the glass tile with).

Another kind is a tubular before the head of the sintering on the gold steel sand-like, this can only hit the glass class and general glazed tiles. The latter two can now be seen on the market the thinnest only 4 ~ 6mm. drilling tiles to use a hammer or impact drills with impact drills, drilling glass drills need to be used with water operation, operation of the drilling speed from slow to fast.

Drilling ceramic tile with hammer or impact drill with impact drill, drilling glass with electric drill with glass drill, need to operate with water, drilling speed from slow to fast. Various sizes of glass drill bit, the first through the wall tiles, and then use the impact drill in the cement or brick wall to hit the eye. General power tools are sold in the place. Various sizes of glass drills can make holes in tiles, first through the wall tiles, and then use the impact drill to make holes in the cement or brick wall.

Expanded Information:

The structural characteristics of twist drills and their cutting Influence:

(1) The diameter of twist drill is limited by the diameter of the hole, the spiral groove makes the core thinner and the rigidity of the drill bit is low; there are only two prongs guided by the belt, the axis of the hole is easy to be skewed; the transverse edge makes it difficult to center the hole, the axial resistance increases, and the drill bit is easy to oscillate. Therefore, the shape and position error of the drilled hole is larger.

(2) twist drills are curved surfaces on both the front and back cutting surfaces, with different front and back angles at various points along the main cutting edge, and the front angle of the cross blade is -55°. Cutting conditions are very poor; the distribution of cutting speed along the cutting edge is unreasonable, and the tip with the lowest strength has the highest cutting speed, so it wears badly. As a result, the machined hole precision is low.

(3) The main cutting edge of the drill is fully involved in cutting, and the cutting speeds at each point on the edge are not equal, so it is easy to form spiral chips, and it is difficult to remove chips. Therefore, the chip and hole wall extrusion friction, often scratch the hole wall, the surface roughness after processing is very low

The twist drill is a tool for drilling round holes in the workpiece by rotating and cutting relative to a fixed axis. Because of its chip flutes into a spiral and the shape of the twist and so named. Spiral grooves have 2, 3 or more grooves, but 2 grooves are the most common. Twist drill can be clamped in manual, electric handheld drilling tools or drilling machine, milling machine, lathe and even machining centers. The drill material is usually high speed tool steel or carbide.

Baidu Encyclopedia-Twist Drill

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