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  2. List of drill and tap sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

    The drill sizes that are near this are 25 ⁄ 64 (0.391 in; 89.4%), 10 mm (0.393 in; 90%), and letter X (0.397 in; 90.8%); any of these will work well. Example (metric, coarse): For M7.0×1.0 (an intended screw with a diameter of 7.0 mm and a pitch of 1 mm between each thread, which is considered coarse ), 7.0 mm × 0.85 = 5.95 mm.

  3. Drill bit sizes - Wikipedia

    en.wikipedia.org/wiki/Drill_bit_sizes

    So a 1 / 2 in (12.7 mm) diameter drill will be able to drill a hole 4 + 1 / 2 in (114.3 mm) deep, since it is 9 times the diameter in length. A 1 / 8 in (3.175 mm) diameter drill can drill a hole 1 + 5 / 8 in (41.275 mm) deep, since it is 13 times the diameter in flute length. [3]

  4. Drill bit - Wikipedia

    en.wikipedia.org/wiki/Drill_bit

    An 1/8 inch left-hand drill bit. Left-hand bits are almost always twist bits and are predominantly used in the repetition engineering industry on screw machines or drilling heads. Left-handed drill bits allow a machining operation to continue where either the spindle cannot be reversed or the design of the machine makes it more efficient to run ...

  5. Drill bushing - Wikipedia

    en.wikipedia.org/wiki/Drill_bushing

    A drill bushing, also known as a jig bushing, [1] is a tool used in metalworking jigs to guide cutting tools, most commonly drill bits. Other tools that are commonly used in a drill bushing include counterbores, countersinks, and reamers. They are designed to guide, position, and support the cutting tool. [2]

  6. 1/2 − 1/4 + 1/8 − 1/16 + ⋯ - ⋯ - Wikipedia

    en.wikipedia.org/wiki/1/2_%E2%88%92_1/4_%2B_1/8...

    Demonstration of ⁠ 2 / 3 ⁠ via a zero-value game. A slight rearrangement of the series reads + + =. The series has the form of a positive integer plus a series containing every negative power of two with either a positive or negative sign, so it can be translated into the infinite blue-red Hackenbush string that represents the surreal number ⁠ 1 / 3 ⁠:

  7. Grinding wheel - Wikipedia

    en.wikipedia.org/wiki/Grinding_wheel

    2.8 Mounted points. 2. ... Grinding wheels are wheels that contain abrasive compounds ... used in electric mill, hanging mill, hand drill. Many of the main types of ...

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