Low spiral (low twist rate or 'elongated flute') drill bits are used in cutting applications where high cutting speeds are traditionally used, and where the material has a tendency to gall on the bit or otherwise clog the hole, such as aluminum or copper. A fast spiral (high twist rate or 'compact flute') drill bit is used in high feed rate applications under low spindle speeds, where removal of a large volume of chips is required. The spiral (or rate of twist) in the drill bit controls the rate of chip removal.

Characteristics ĭrill geometry has several characteristics: There are also certain specialized drill bits that can create holes with a non-circular cross-section. A comprehensive drill bit and tap size chart lists metric and imperial sized drills alongside the required screw tap sizes. The drill will grasp the upper end of a bit called the shank in the chuck.ĭrills come in standardized drill bit sizes. In order to create holes drill bits are usually attached to a drill, which powers them to cut through the workpiece, typically by rotation. Drill bits come in many sizes and shapes and can create different kinds of holes in many different materials.

JSTOR ( July 2021) ( Learn how and when to remove this template message)įrom top: Spade, brad point, masonry, and twist drills bits Drill bit (upper left), mounted on a pistol-grip electric drill A set of masonry drillsĭrill bits are cutting tools used in a drill to remove material to create holes, almost always of circular cross-section.

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