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2. Hole punch - Wikipedia

   en.wikipedia.org/wiki/Hole_punch

   Three different international-standard two-hole punches. A hole punch, also known as hole puncher, or paper puncher, is an office tool that is used to create holes in sheets of paper, often for the purpose of collecting the sheets in a binder or folder (such collected sheets are called loose leaves).

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4. Comb binding - Wikipedia

   en.wikipedia.org/wiki/Comb_binding

   To bind a document, the user first punches holes in the paper with a specialized hole punch. Pages must be punched a few at a time with most of these machines. If hard covers are desired, they must be punched as well. In bulk applications, a paper drilling machine may be used. Then the user chooses a spine size that will match the document.

5. Paper drilling - Wikipedia

   en.wikipedia.org/wiki/Paper_drilling

   Paper-drilling machine. Paper drilling is a technique used in binderies for providing large quantities of paper with round holes. [1] The paper can be processed as loose leaves and in brochures (stitched, perfectly bound). [citation needed] The holes can be drilled for storage purposes, such as filing, [1] or sometimes for decorative purposes ...

6. 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.

7. Repoussé and chasing - Wikipedia

   en.wikipedia.org/wiki/Repoussé_and_chasing

   A "hollow-faced" punch has a raised contour (circular, or with some other shape) with a hollowed-out middle, and is used to stamp that contour, usually on the front face. A lightweight "chasing hammer", to drive the punches. An oxyacetylene torch, blowtorch, or a forge for annealing or hot-working.