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  2. Screw extractor - Wikipedia

    en.wikipedia.org/wiki/Screw_extractor

    The screw is drilled out with the appropriate drill and drill bushing. The extractor is then hammered into the hole with a brass hammer, because a steel hammer is more likely to cause the extractor to break. The appropriate special nut is then attached to the end of the extractor. The nuts can then be turned with a wrench to remove the screw. [1]

  3. Annular cutter - Wikipedia

    en.wikipedia.org/wiki/Annular_cutter

    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.

  4. Countersink - Wikipedia

    en.wikipedia.org/wiki/Countersink

    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 ...

  5. Core drill - Wikipedia

    en.wikipedia.org/wiki/Core_drill

    Truck-mounted core drill. A modern core drill is a drill specifically designed to remove a cylinder of material, much like a hole saw. The material left inside the drill bit is referred to as the core. Core drills used in metal are called annular cutters. Core drills used for concrete and hard rock generally use industrial diamond grit as the ...

  6. Drill bit - Wikipedia

    en.wikipedia.org/wiki/Drill_bit

    A bit used to enlarge an existing hole is called a core drill bit. The existing hole may be the result of a core from a casting or a stamped (punched) hole. The name comes from its first use, for drilling out the hole left by a foundry core, a cylinder placed in a mould for a casting that leaves an irregular hole in the product. This core drill ...

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    The search engine that helps you find exactly what you're looking for. Find the most relevant information, video, images, and answers from all across the Web.

  8. Pilot hole - Wikipedia

    en.wikipedia.org/wiki/Pilot_hole

    In construction, a pilot hole is a small hole drilled into a piece of construction material. Its purpose may be: to guide a larger drill to the appropriate location and ease the job of the larger drill, allow the insertion of another hole-making tool, such as a knockout punch, that will produce the final-sized hole, or

  9. Burrow, Chase lift Bengals after botched blocked punt by ...

    www.aol.com/burrow-chase-lift-bengals-botched...

    Dallas Cowboys linebacker Nick Vigil (41) reacts after a punt he blocked was recovered by the Cincinnati Bengals during the second half of an NFL football game, Monday, Dec. 9, 2024, in Arlington ...

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