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  2. List of drill and tap sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

    Below is a comprehensive drill and tap size chart for all drills and taps: Inch, imperial, and metric, up to 36.5 millimetres (1.44 in) in diameter. In manufactured parts, holes with female screw threads are often needed; they accept male screws to facilitate the building and fastening of a finished assembly.

  3. Barrack buster - Wikipedia

    en.wikipedia.org/wiki/Barrack_buster

    Barrack buster is the colloquial name given to several improvised mortars, developed in the 1990s by the engineering unit of the Provisional Irish Republican Army (IRA).. The improvised mortar properly called "barrack buster" - known to the British security forces as the Mark 15 mortar - fired a 1 metre (3 ft 3 in) long metal propane cylinder with a diameter of 36 centimetres (14 in), which ...

  4. Cement accelerator - Wikipedia

    en.wikipedia.org/wiki/Cement_accelerator

    A cement accelerator is an admixture for the use in concrete, mortar, rendering or screeds. The addition of an accelerator speeds the setting time and thus cure time starts earlier. [ 1 ] This allows concrete to be placed in winter with reduced risk of frost damage. [ 2 ]

  5. Drill bit sizes - Wikipedia

    en.wikipedia.org/wiki/Drill_bit_sizes

    For Morse taper-shank drill bits, the standard continues in 1/64 inch increments up to 1¾ inch, then 1/32 inch increments up to 2¼ inch, 1/16 inch increments up to 3 inches, 1/8 inch increments up to 3¼ inches, and a single 1/4 inch increment to 3½ inches. One aspect of this method of sizing is that the size increment between drill bits ...

  6. Polymer concrete - Wikipedia

    en.wikipedia.org/wiki/Polymer_concrete

    However, recent progress has led to significant reductions in cost, meaning that the use of polymer concrete is gradually becoming more widespread. [ 4 ] [ 5 ] Polymer concrete in the form of epoxy granite is becoming more widely used in the construction of machine tool bases (such as mills and metal lathes ) in place of cast iron due to its ...

  7. Mortier de 12 Gribeauval - Wikipedia

    en.wikipedia.org/wiki/Mortier_de_12_Gribeauval

    It was part of the siege artillery. The measurement of the mortar is expressed by the diameter of the ball, using the French ancient system of measurement, in which 1 pouce (1 inch) is worth 2.707 cm. The Mortier de 12 pouces Gribeauval was used extensively during the wars following the French Revolution, as well as the Napoleonic wars.

  8. Drill bit - Wikipedia

    en.wikipedia.org/wiki/Drill_bit

    Most drill bits for consumer use have straight shanks. For heavy duty drilling in industry, bits with tapered shanks are sometimes used. Other types of shank used include hex-shaped, and various proprietary quick release systems. The diameter-to-length ratio of the drill bit is usually between 1:1 and 1:10.

  9. Drill - Wikipedia

    en.wikipedia.org/wiki/Drill

    The distance from the center of the chuck to the closest edge of the column is the throat. The swing is simply twice the throat, and the swing is how drill presses are classified and sold. Thus, a tool with 4" throat has an 8" swing (it can drill a hole in the center of an 8" work piece), and is called an 8" drill press. [22]