Individuals have been drilling holes in rock and masonry for quite a long time. Up until the middle of the 20th century, holes were created by using something like a star bit and hammering the rock by hand. The driller would hit a lick with a hammer and offer the little a partial turn so the hole would be around. Then he would have to extract the debris and dust out of the hole by hand. In the 1960’s a revolution for masonry drilling was created with Skill Corporation’s introduction of these 726 and 736 model rotary hammers. These models used a fluted bit with a carbide tip soldered to a slot in the tip. The pieces used in those ancient Skill rotary hammers are very similar to the ones used now. They consisted of a quite difficult carbide tip. They had a twisted flute running the length of this piece. Additionally, they had a hex shank that fit to the hammers so the tool bit driver could rotate the bit while drilling.
The carbide tip is what produces the little cut the masonry. Carbide is very hard, with no carbide tip the conclusion of the drill bit would be crushed to a mushroom shape that would not cut anything. The carbide tip works great until it runs into something equally as hard, such as fortified bars rebar. This can break a tip and then your piece is worthless. The fluting or flutes on a little is what resemble a drill. They are not for drilling but for pulling the debris and dust from the hole as it is being cut. One of the tricks to drilling quicker and making pieces last longer is to back out of the hole while the bohrhammer-test is still running. Do this every three inches or so and it will pull out dust. This makes it much easier for the trick to cut and reduces the amount of abrasive dust to wear out the piece.
The last portion of the piece is that the drive end. It is either a hex shank, a spine shank, or an SDS type shank that permits the little driver to turn the piece. To get the most from your drill, be sure that the tip, the flutes and the shank are trimming, pulling and rotating as they are designed. Cordless Drills have provided a level of independence from the necessity of being inside cable’s span of an electrical power outlet. When these drills have previously suffered from the disadvantage of being reliant upon batteries that necessitated regular charging and had a rather short life span, in more recent times vastly enhanced battery technology is creating the cordless drill a much more flexible alternative.