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  2. Fein (company) - Wikipedia

    en.wikipedia.org/wiki/Fein_(company)

    In 1895, Fein invented the electric hand drill, which is considered the forerunner of power tools. [1] [2] The first "drill with electro-pneumatic hammer mechanism" was built in 1914 by the company and applied for a patent. Fein developed the first tin snips and the first jigsaw in 1927. [3]

  3. Magnetic drilling machine - Wikipedia

    en.wikipedia.org/wiki/Magnetic_drilling_machine

    A morse taper 3 arbor equipped magnetic drill machine using taper shank drill bits. The arbor or chuck on a magnetic drill is attached to the motor. It is a type of clamp used to attach the core drills. There are mainly two types of chuck available for the magnetic drill, industrial arbor (manual tightening) and quick change drill chucks. The ...

  4. Chuck (engineering) - Wikipedia

    en.wikipedia.org/wiki/Chuck_(engineering)

    A pin chuck is a specialized chuck designed to hold small drills (less than 1 mm (0.039 in) in diameter) that could not be held securely in a normal drill chuck. The drill is inserted into the pin chuck and tightened; the pin chuck has a shaft which is then inserted into the larger drill chuck to hold the drill securely. Pin chucks are also ...

  5. Machine taper - Wikipedia

    en.wikipedia.org/wiki/Machine_taper

    Even on many drill presses, handheld drills, and lathes, which have chucks (such as a drill chuck or collet chuck), the chuck is attached by a taper. On drills, drill presses, and milling machines , the male member is the tool shank or toolholder shank, and the female socket is integral with the spindle.

  6. Drill bit shank - Wikipedia

    en.wikipedia.org/wiki/Drill_bit_shank

    Such a drill bit is called a reduced-shank or blacksmith's drill. For example, this allows a 12-inch (13 mm) bit to be used in a pistol-grip drill's 3 ⁄ 8-inch (9.5 mm) chuck. One particular type of reduced-shank drill bits are Silver & Deming (S&D) bits, whose sets run from 9 ⁄ 16-inch (14 mm) to 1 + 12-inch (38 mm) drill body ...

  7. Wilhelm Emil Fein - Wikipedia

    en.wikipedia.org/wiki/Wilhelm_Emil_Fein

    Wilhelm Emil Fein (16 January 1842 – 6 October 1898) was a German inventor. He invented the worldwide first portable electric drill. Life early Fein portable ...

  8. Drill - Wikipedia

    en.wikipedia.org/wiki/Drill

    A standard hammer drill accepts 6 mm (1/4 inch) and 13 mm (1/2 inch) drill bits. The operator experiences considerable vibration, and the cams are generally made from hardened steel to avoid them wearing out quickly. In practice, drills are restricted to standard masonry bits up to 13 mm (1/2 inch) in diameter.

  9. List of drill and tap sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

    A good tap drill is 85% (± 2 pp) of major diameter for coarse threads, and 90% (± 2 pp) of major diameter for fine threads. [ 1 ] For metric V threads , the concept of major minus pitch (i.e., the major or widest diameter of the intended screw in millimeters minus the pitch of the threads of that screw in millimeters per thread) yields a good ...

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