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  2. Hot tapping - Wikipedia

    en.wikipedia.org/wiki/Hot_tapping

    Hot taps can range from a ½ inch hole designed for something as simple as quality control testing, up to a 48-inch tap for the installation of a variety of ports, valves, t-sections or other pipes. Hot Tap Procedures: A. A hot tap saddle, service saddle or welded threadolet, valve installed, assembly is pressure tested and hot tap machine ...

  3. Lapping - Wikipedia

    en.wikipedia.org/wiki/Lapping

    Lapping machine. Lapping is a machining process in which two surfaces are rubbed together with an abrasive between them, by hand movement or using a machine. Lapping often follows other subtractive processes with more aggressive material removal as a first step, such as milling and/or grinding. Lapping can take two forms.

  4. Tap and die - Wikipedia

    en.wikipedia.org/wiki/Tap_and_die

    where is the tap drill size, is the major diameter of the tap (e.g., 10 mm for a M10×1.5 tap), and pitch is the pitch of the thread (1.5 mm in the case of a standard M10 tap) and so the correct drill size is 8.5 mm. This works for both fine and coarse pitches, and also produces an approximate 75% thread.

  5. Threaded insert - Wikipedia

    en.wikipedia.org/wiki/Threaded_insert

    TIME-SERT insert. A threaded insert, also known as a threaded bushing, is a fastener element that is inserted into an object to add a threaded hole. [1] They may be used to repair a stripped threaded hole, provide a durable threaded hole in a soft material, place a thread on a material too thin to accept it, mold or cast threads into a work piece thereby eliminating a machining operation, or ...

  6. Friction drilling - Wikipedia

    en.wikipedia.org/wiki/Friction_drilling

    The basic steps in the friction drilling process: A.Applying pressure. B.Tool heats target and melts through it. C.Screw thread tapping. Friction drilling is a method of making holes in metal in which the material is pushed out of the way with the aid of heat from friction.

  7. Electrical discharge machining - Wikipedia

    en.wikipedia.org/wiki/Electrical_discharge_machining

    The first commercially available NC machine built as a wire-cut EDM machine was manufactured in the USSR in 1967. Machines that could optically follow lines on a master drawing were developed by David H. Dulebohn's group in the 1960s at Andrew Engineering Company [9] for milling and grinding machines. Master drawings were later produced by ...

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