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  2. Punch (tool) - Wikipedia

    en.wikipedia.org/wiki/Punch_(tool)

    Prick punch. A prick punch is similar to a center punch but used for marking out. It has a sharper angled tip to produce a narrower and deeper indentation. The indentation can then be enlarged with a center punch for drilling. The tip of a prick punch is 60 degrees (the angle depends on what type of prick punch one is using). [1]

  3. Marking out - Wikipedia

    en.wikipedia.org/wiki/Marking_out

    Square — to transfer 90° angles to the workpiece Punches — either prick or center punch to create permanent marks or dimples for drill bits to start in Automatic center punch — a spring-loaded punch that creates prick punch marks without the need for a ball peen hammer

  4. Automatic center punch - Wikipedia

    en.wikipedia.org/wiki/Automatic_center_punch

    The punch; The intermediate rod (tumbler) The hammer (hammer mass) The hammer mass is spring-loaded from the back of the punch by a large spring. (The spring's preload compression can usually be adjusted by loosening or tightening the end cap at the back-most portion of the punch, to decrease or increase the force of the punch.)

  5. Calipers - Wikipedia

    en.wikipedia.org/wiki/Calipers

    Vernier calipers are rugged and have long-lasting accuracy, are coolant proof, are not affected by magnetic fields, and are largely shockproof. They may have both centimeter and inch scales. However, vernier calipers require good eyesight or a magnifying glass to read and can be difficult to read from a distance or from awkward angles. It is ...

  6. Machinist square - Wikipedia

    en.wikipedia.org/wiki/Machinist_square

    A machinist square or engineer's square is the metalworkers' equivalent of a try square.It consists of a steel blade inserted and either welded or pinned into a heavier body at an angle of 90°.

  7. Punchcutting - Wikipedia

    en.wikipedia.org/wiki/Punchcutting

    A punch (left) and the respective matrix produced from it (right). The small letters at the base of the matrix are founders marks. Punchcutting is a craft used in traditional typography to cut letter punches in steel as the first stage of making metal type. [1]

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  9. 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.