A Countersink (sign: ⌵) is a conical hole cut right into the produced things, or the cutter made use of to reduce such a hole. A common usage is to allow the head of a countersunk screw, screw or secure, when positioned in the opening, to rest flush with or listed below the surface area of the bordering material (comparative, a counterbore makes a flat-bottomed hole that may be used with a socket-head cap screw). A countersink might likewise be made use of to get rid of the burr left from a drilling or tapping procedure consequently improving the surface of the item as well as eliminating any harmful sharp edges.
The standard geometry of a countersink (cutter) inherently can be related to the plunging applications defined over a (axial feed just) as well as also to other milling applications (sideways traversal). Countersinks overlap in type, function, as well as sometimes name with chamfering endmills (endmills with angled pointers). Despite the name offered to the cutter, the surface area being created might be conelike chamfer (diving applications) or a diagonal edge for the intersection of 2 aircrafts (passing through applications).