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An annular cutter (also called a core drill, core cutter, broach cutter, trepanning drill, hole saw, or cup-type cutter) is a form of core drill used to create holes in metal. An annular cutter, named after the annulus shape , cuts only a groove at the periphery of the hole and leaves a solid core or slug at the center.
Hand-powered metal drills have been in use for centuries. They include: Auger, a straight shaft with a wood-cutting blade at the bottom and a T-shaped handle; Brace, a modified auger powered by means of a crankshaft; Gimlet, a small tool for drilling holes; Bradawl, similar to a screwdriver but with a drilling point
A hand drill is the simplest primitive method to produce rapid rotary motion of a rod. It consists in holding the rod vertically between both hands and moving these back and forth, in opposite directions, as in rubbing them. The rod typically is one or two feet long and half an inch in diameter. Hand drills have been used by many primitive ...
Snips and shears are used for cutting metal. Various types of snips and shears are used for different metals and thicknesses. Some shears allow longer or shorter cuts depending on the shear's style. Certain types of snips and shears are recommended for aviation metalworking. [2]
Drilling is a cutting process where a drill bit is spun to cut a hole of circular cross-section in solid materials. The drill bit is usually a rotary cutting tool, often multi-point. The bit is pressed against the work-piece and rotated at rates from hundreds to thousands of revolutions per minute.
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 ...