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  2. 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 ...

  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. 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 ...

  5. List of screw drives - Wikipedia

    en.wikipedia.org/wiki/List_of_screw_drives

    A set of torq-set bits. Torq-set is a cruciform screw drive used in torque-sensitive applications. The Torq-set head is similar in appearance to a Phillips drive in that it has a cross with 4 arms. In Torq-set however, the lines are offset from each other, so they do not align to form intersecting slots across the top of the head.

  6. Robertson screw - Wikipedia

    en.wikipedia.org/wiki/Robertson_screw

    Screwdriver bits in different sizes for Robertson screws When Henry Ford tried the Robertson screws, he found that they saved considerable time in Model T production. When Robertson refused to license the design, Ford realized that the supply of screws would not be guaranteed, and chose to limit their use to his Canadian division.

  7. Obscure rule leads to Chargers getting 1st made fair catch ...

    www.aol.com/sports/obscure-rule-leads-chargers...

    That set Chargers coach Jim Harbaugh's wheels in motion. LA had the option to attempt a free kick after the fair catch. It was the rare instance in which it made sense because no time remained on ...

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