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Before boring machines were invented, carpenters used hand-powered augers to bore holes. Most common were T-handled augers. The shape of the drill bits changed over time, with the spoon bit and shell bit being common before the invention of the spiral or twist bit in 1771 [1] which removes the cuttings as it turns. The exact origin of this ...
ANSI B94.11M-1979 sets size standards for jobber-length straight-shank twist drill bits from 1/64 inch through 1 inch in 1/64 inch increments. For Morse taper -shank drill bits, the standard continues in 1/64 inch increments up to 1¾ inch, then 1/32 inch increments up to 2¼ inch, 1/16 inch increments up to 3 inches, 1/8 inch increments up to ...
From top: Spade, brad point, masonry, and twist drills bits Drill bit (upper left), mounted on a pistol-grip electric drill A set of masonry drills. A drill bit is a cutting tool used in a drill to remove material to create holes, almost always of circular cross-section. Drill bits come in many sizes and shapes and can create different kinds of ...
Auger bit, a drill bit; Auger conveyor, a device for moving material by means of a rotating helical flighting; Auger (platform), the world's first tension leg oil rig; see Big, Bigger, Biggest; Earth auger, a drilling tool or machine used for making holes in the ground; Wood auger, a drill for making holes in wood (or in the ground)
Study of a man using an auger, from The Seven Sorrows of the Virgin, by Albrecht Dürer, c. 1496. The classical design has a helical screw blade winding around the bottom end of the shaft. The lower edge of the blade is sharpened and scrapes the wood; the rest of the blade lifts the chips out of the way.
A skid-steer loader with an earth auger attachment. Construction drill auger. Hand-powered earth augers are typically used to plant saplings and trees or to set up posts for fences or other ends. [7] Large mechanized earth augers, called drilling rigs, are used to make holes for piles destined to be deep foundations or retaining wall. [citation ...