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2. Angle grinder - Wikipedia

   en.wikipedia.org/wiki/Angle_grinder

   An angle grinder, also known as a side grinder or disc grinder, is a handheld power tool used for grinding (abrasive cutting) and polishing. Although developed originally as tools for rigid abrasive discs, the availability of an interchangeable power source has encouraged their use with a wide variety of cutters and attachments.

3. Tap and die - Wikipedia

   en.wikipedia.org/wiki/Tap_and_die

   You can't correct the angle after the first thread or two. To help with this alignment task, several kinds of jigs and fixtures can be used to provide the correct geometry (i.e., accurate coaxiality with the hole) without having to use freehand skill to approximate it: Hand-tapper: A simple fixture analogous to an arbor press in its basic shape.

4. Grinding (abrasive cutting) - Wikipedia

   en.wikipedia.org/wiki/Grinding_(abrasive_cutting)

   A man grinding on metal using an angle grinder, causing a lot of sparks. Grinding is a type of abrasive machining process which uses a grinding wheel as cutting tool. A wide variety of machines are used for grinding, best classified as portable or stationary: Portable power tools such as angle grinders, die grinders and cut-off saws

5. Grinding machine - Wikipedia

   en.wikipedia.org/wiki/Grinding_machine

   Its uses include shaping tool bits or various tools that need to be made or repaired. Bench grinders are manually operated. Cylindrical grinder, which includes both the types that use centers and the centerless types. A cylindrical grinder may have multiple grinding wheels. The work piece is rotated and fed past the wheel(s) to form a cylinder.

6. Machine taper - Wikipedia

   en.wikipedia.org/wiki/Machine_taper

   The angle of the cone is 16°51′ (16.85°) with an OD of 1.25″ and a length of 15 ⁄ 16 ″. [21] (source, Bridgeport Manufacturer) The diameter of the parallel locating portion is not a "fractional inch" size like the other dimensions and is 0.949″ to 0.9495″. Tools with an R8 taper are inserted directly into the machine's spindle.

7. Cincinnati Milling Machine Company - Wikipedia

   en.wikipedia.org/wiki/Cincinnati_Milling_Machine...

   It is a horizontal, with an overarm for the arbor. The Cincinnati Milling Machine Company was an American machine tool builder headquartered in Cincinnati, Ohio . Incorporated in 1889, the company was formed for the purpose of building and promoting innovative new machine tool designs, especially milling machines .