A countersink is a conical hole that is cut into a manufactured object. It may be used to allow the head of the countersink bolt to sit flush with the surface of the surrounding material. A countersink may also be used to remove the burr that is left from a drilling operation. A burr consists of small pieces that remain attached to a work-piece after a modification process. A countersink typically improves the finish of the product and removes any harmful sharp edges from the piece.
A countersink is usually used in drills, drill presses, milling machines, lathes and many other machines. A drill press is a fixed style of drill that may be mounted on a stand or bolted to the floor. A milling machine is used to machine solid materials. A lathe spins the work-piece to perform many different operations such as cutting, sanding, knurling, drilling or deformation.
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