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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. 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.

  4. 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 ...

  5. 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.

  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 ...

  7. Who killed JonBenét Ramsey? Her dad believes DNA could reveal ...

    www.aol.com/killed-jonben-t-ramsey-her-070610776...

    A look back at how "48 Hours" covered the 1996 Christmastime murder of JonBenét Ramsey in 2002, and what her father John Ramsey says about the unsolved Colorado case nearly 28 years later.

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