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  2. Tap and die - Wikipedia

    en.wikipedia.org/wiki/Tap_and_die

    This feature causes the tap to continuously break the chip and eject it forward into the hole, preventing crowding. Spiral point taps are usually used in holes that go all the way through the material, so that the chips can escape. Another version of the spiral point plug tap is the spiral flute tap, whose flutes resemble those of a twist drill ...

  3. Computer case screws - Wikipedia

    en.wikipedia.org/wiki/Computer_case_screws

    The #6-32 UNC is a UTS screw specifying a major thread diameter of #6 which is defined as 0.1380 inches (3.51 mm); and 32 tpi (threads per inch) which equates to a thread pitch of 0.031250 inches (0.7938 mm). The optional UNC specification indicates the standard coarse thread is used which is defined for #6 screws as 32 tpi rendering 'UNC ...

  4. List of screw drives - Wikipedia

    en.wikipedia.org/wiki/List_of_screw_drives

    Flat-blade jeweler's screwdrivers and the tips found in 1 ⁄ 4-inch or 6.4-millimeter drive sets are generally hollow-ground. Note that it is this typical chisel shape which allows 9 screwdriver sizes to drive 24 different slotted screw sizes, with the drawbacks of not fitting as closely as a hollow-ground screwdriver would, and increasing the ...

  5. RML 2.5-inch mountain gun - Wikipedia

    en.wikipedia.org/wiki/RML_2.5-inch_Mountain_Gun

    Writers who refer to "7-pounders" in World War I are in fact referring to this 2.5-inch (64 mm) gun. Romania bought 36 of these guns in 1883–1884, being designated in the local military nomenclature as "63 mm Armstrong mountain guns model 1883". They were the first guns designed for mountain warfare in Romanian use.

  6. Punched tape - Wikipedia

    en.wikipedia.org/wiki/Punched_tape

    Tape for punching was usually 0.00394 inches (0.100 mm) thick. The two most common widths were 11 ⁄ 16 inch (17 mm) for five bit codes, and 1 inch (25 mm) for tapes with six or more bits. Hole spacing was 0.1 inches (2.5 mm) in both directions. Data holes were 0.072 inches (1.8 mm) in diameter; sprocket feed holes were 0.046 inches (1.2 mm). [8]

  7. Drive bay - Wikipedia

    en.wikipedia.org/wiki/Drive_bay

    For 2.5-inch bays, actual dimensions are 2 + 3 ⁄ 4 inches (69.9 mm) wide, between 5 millimetres (0.20 in) and 3 ⁄ 4 inch (19.1 mm) high, and 3.955 inches (100.5 mm) deep. However, most laptops have drive bays smaller than the 15 mm specification. 2.5-inch hard drives may range from 7 mm to 15 mm in height.

  8. Drill bit - Wikipedia

    en.wikipedia.org/wiki/Drill_bit

    The correct tool to start a traditionally drilled hole (a hole drilled by a high-speed steel (HSS) twist drill bit) is a spotting drill bit (or a spot drill bit, as they are referenced in the U.S.). The included angle of the spotting drill bit should be the same as, or greater than, the conventional drill bit so that the drill bit will then ...

  9. MythBusters (2011 season) - Wikipedia

    en.wikipedia.org/wiki/MythBusters_(2011_season)

    None of their shots turned the merry-go-round more than a fraction of an inch, but they did punch holes through the rails. A 12-gauge shotgun loaded with deer slugs gave the same result. The team added steel plates to the rails in an attempt to stop the bullets and force them to transfer their energy to the merry-go-round.

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