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  2. Punch (tool) - Wikipedia

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

    A center punch is used to mark the center of a point. It is usually used to mark the center of a hole when drilling holes. A drill has the tendency to "wander" if it does not start in a recess. A center punch forms a large enough dimple to "guide" the tip of the drill. The tip of a center punch has an angle between 60 and 90 degrees. [1]

  3. Punchcutting - Wikipedia

    en.wikipedia.org/wiki/Punchcutting

    Punchcutting is a craft used in traditional typography to cut letter punches in steel as the first stage of making metal type. [1] Steel punches in the shape of the letter would be used to stamp matrices into copper, which were locked into a mould shape to cast type. Cutting punches and casting type was the first step of traditional typesetting ...

  4. Knockout punch - Wikipedia

    en.wikipedia.org/wiki/Knockout_punch

    The screw is then threaded into the punch and the screw tightened until the punch is drawn completely through the sheet metal. [2] The manual system uses a screw that has a standard hex head or square head and is driven using an allen key or wrench. A manual knockout punch can handle holes from 0.5 to 1.25 in (13 to 32 mm).

  5. Punching - Wikipedia

    en.wikipedia.org/wiki/Punching

    The punch force required to punch a piece of sheet metal can be estimated from the following equation: [4] F = 0.7 t L ( U T S ) {\displaystyle F=0.7tL(UTS)} Where t is the sheet metal thickness, L is the total length sheared (perimeter of the shape), and UTS is the ultimate tensile strength of the material.

  6. Repoussé and chasing - Wikipedia

    en.wikipedia.org/wiki/Repoussé_and_chasing

    A set of "punches", that is, chisels with smooth tips that are used to push the metal: A "liner" has a flattened tip with a slightly curved blunt edge. It is used to chase narrow grooves in the metal, or to repoussé narrow ridges from the back side; both for outlining the work, and to refine edges in the final object.

  7. NYT โ€˜Connectionsโ€™ Hints and Answers Today, Saturday, December 14

    www.aol.com/nyt-connections-hints-answers-today...

    This popular vitamin C serum is on sale for just $10: '60 is the new 40' AOL. ... Female passenger killed after being set on fire on an NYC subway train. Sports. Sports. Associated Press.

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