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  2. 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 ...

  3. Drill bit - Wikipedia

    en.wikipedia.org/wiki/Drill_bit

    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 ...

  4. Drill - Wikipedia

    en.wikipedia.org/wiki/Drill

    Countersink Drill Bits – a drill bit to create a wide opening for a screw; High-Speed Drill Bits – these are drill bits made to be very strong and therefore are often used to cut metals; Spade drill Bits – spade-shaped drill bits used primarily to bore holes in softwoods; Hole Saw – a large drill bit with a jagged edge, ideal for ...

  5. Cutting tool (machining) - Wikipedia

    en.wikipedia.org/wiki/Cutting_tool_(machining)

    Rotary cutting tools include drill bits, countersinks and counterbores, taps and dies, reamers, and cold saw blades. Other cutting tools, such as bandsaw blades, hacksaw blades, and fly cutters, combine aspects of linear and rotary motion. The majority of these types of cutting tools are often made from HSS (High-Speed-Steel).

  6. Reamer - Wikipedia

    en.wikipedia.org/wiki/Reamer

    A combination reamer has two or more cutting surfaces. The combination reamer is precision ground into a pattern that resembles the part's multiple internal diameters. The advantage of using a combination reamer is to reduce the number of turret operations, while more precisely holding depths, internal diameters and concentricity.

  7. Trump invites China's Xi to inauguration, experts call it ...

    www.aol.com/news/trump-invites-chinas-xi-other...

    By Steve Holland and David Brunnstrom. WASHINGTON (Reuters) -U.S. President-elect Donald Trump has invited Chinese President Xi Jinping and other foreign leaders to his inauguration next month in ...

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