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2. Edge-notched card - Wikipedia

   en.wikipedia.org/wiki/Edge-notched_card

   The notches allow efficient sorting of a large number of cards in a paper-based database, as well as the selection of specific cards matching multiple desired criteria. Unlike machine-readable punched cards , edge-notched cards were designed to be manually sorted by human operators.

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 ...

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5. 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.

6. Punching - Wikipedia

   en.wikipedia.org/wiki/Punching

   A die is located on the opposite side of the workpiece and supports the material around the perimeter of the hole and helps to localize the shearing forces for a cleaner edge. There is a small amount of clearance between the punch and the die to prevent the punch from sticking in the die and so less force is needed to make the hole.

7. Blanking and piercing - Wikipedia

   en.wikipedia.org/wiki/Blanking_and_piercing

   Die roll takes the form of a radius around the outside edge of the blank and the pierced holes. After compression, the part shears for about 10% of the part thickness, and then fractures free of the strip or sheet. This fracturing produces a raised, jagged edge which is called a "burr". Burrs are typically removed by tumbling in a secondary ...