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  2. Hole punch - Wikipedia

    en.wikipedia.org/wiki/Hole_punch

    One or more sheets of paper are inserted between the head and the die, with the flat face of the head parallel to the surface of the sheets. Moving the handle pushes the head straight through the sheets of paper. The hard edge of the punch vs the die cuts a hole in the paper, pushing the cut piece out the bottom of the die.

  3. 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]

  4. Blanking and piercing - Wikipedia

    en.wikipedia.org/wiki/Blanking_and_piercing

    The punch/die clearance is a crucial parameter, which determines the load at the cutting edge of the tool, commonly known as point pressure. Excessive point pressure can accelerate tool wear. The surface quality of the trimmed piece is affected by the clearance, too.

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  6. Trepanning - Wikipedia

    en.wikipedia.org/wiki/Trepanning

    Detail from The Extraction of the Stone of Madness, a painting by Hieronymus Bosch depicting trepanation (c. 1488–1516). Trepanning, also known as trepanation, trephination, trephining or making a burr hole (the verb trepan derives from Old French from Medieval Latin trepanum from Greek trúpanon, literally "borer, auger"), [1] [2] is a surgical intervention in which a hole is drilled or ...

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