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In manufacturing, a countersink (symbol: ⌵) is a conical hole cut into a manufactured object, or the cutter used to cut such a hole. A common use is to allow the head of a countersunk bolt , screw or rivet , when placed in the hole, to sit flush with or below the surface of the surrounding material (by comparison, a counterbore makes a flat ...
The brad point drill bit (also known as lip and spur drill bit, and dowel drill bit) is a variation of the twist drill bit which is optimized for drilling in wood. Conventional twist drill bits tend to wander when presented to a flat workpiece. For metalwork, this is countered by drilling a pilot hole with a spotting drill bit.
The uppermost counterbore tools shown in the image are the same device. The smaller top item is an insert, the middle shows another three-fluted counterbore insert, assembled in the holder. The shank of this holder is a Morse taper, although there are other machine tapers that are used in the industry.
In machining, a tool bit is a non-rotary cutting tool used in metal lathes, shapers, and planers. Such cutters are also often referred to by the set-phrase name of single-point cutting tool , as distinguished from other cutting tools such as a saw or water jet cutter .
Such a drill bit is called a reduced-shank or blacksmith's drill. For example, this allows a 1 ⁄ 2 -inch (13 mm) bit to be used in a pistol-grip drill's 3 ⁄ 8 -inch (9.5 mm) chuck. One particular type of reduced-shank drill bits are Silver & Deming ( S&D ) bits, whose sets run from 9 ⁄ 16 -inch (14 mm) to 1 + 1 ⁄ 2 -inch (38 mm) drill ...
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