Information AboutDrill Bits |
| CATEGORIES ABOUT DRILL BIT | |
| drilling and threading | |
| woodworking tools | |
| petroleum production | |
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Drill bits are cutting tools used to create cylindrical holes. Bits are held in a tool called a Drill , which rotates them and provides axial force to create the hole. =Manufacturing Tools= This article describes the types of drill bits in terms of the design of the cutter. The other end of the drill bit, the shank, is described in the Drill Bit Shank article. Drill bits come in standard sizes, described in the Drill Bit Sizes article. The term ''drill'' can refer to a drilling machine, or can refer to a drill bit for use in a drilling machine. In this article, for clarity, ''drill bit'' or ''bit'' is used throughout to refer to a bit for use in a drilling machine, and ''drill'' refers always to a drilling machine. METAL DRILLS Twist drill The twist drill bit is the type produced in largest quantity today. It can be used to create holes in metal, plastic, wood and stone. The twist drill bit was invented by in 1861. He received for his invention on 7 April 1863 . The original method of manufacture was to cut two grooves in opposite sides of a round bar, then to twist the bar to produce the helical flutes. This gave the tool its name. Nowadays, the drill is usually made by rotating the bar while moving it past a Grinding wheel to cut the flutes. Tools recognisable as twist drill bits are currently produced in diameters covering the range at least from 0.05 mm to 100 mm. Lengths up to about 1000 mm are available for use in powered hand tools. The geometry and sharpening of the cutting edges is crucial to the performance of the bit. Users often throw away small bits that become blunt, and replace them with new bits, because they are inexpensive and sharpening them well is difficult. For larger bits, special grinding jigs are available. Manufacturers can produce special versions of the twist drill bit, varying the geometry and the materials used, to suit particular machinery and particular materials to be cut. Twist drill bits are available in the widest choice of tooling materials. However, even for industrial users, most holes are still drilled with a conventional bit of High Speed Steel . Hobbyists are most familiar with straight-shank twist drills. For heavy duty drilling in industry, drills with Tapered shank are used. |
Image:drill Twist MorsejpgTwist Drill Bit With
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