Web Definition: Drill Bit
Drill bits are the working end of drill tools. Bits are interchangeable, meaning that they can be removed from the end of the drill, either to replace a worn part or to change the size of the part. The most familiar type of drill bit is that used in handheld & press-style drills. These bits usually look like cylinders with a helical path of material missing from them & a sharp edge to cut material. Drill bits have different shaped tips for different materials. Other drill bits are essentially the reverse, shaped like Archimedes screws, with the ability to remove material & work like augers. a drag bit is used for soft rocks, like sand & clay. The drill stem is rotated & teeth on the bit tear up the rock. a rock bit consists of teeth on wheels which turn as the drill stem is rotated. These teeth apply a shearing pressure to the rock, breaking it up into small pieces. The original patent for the rotary rock bit was issued to Howard Hughes Sr. in 1909. It consisted of two interlocking wheels. The success of this bit lead to the founding of the Sharp-Hughes Tool Company.
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