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  2. 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.

  3. Hole punch - Wikipedia

    en.wikipedia.org/wiki/Hole_punch

    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). A hole punch can also refer to similar tools for other materials, such as leather, cloth, or sheets ...

  4. Keypunch - Wikipedia

    en.wikipedia.org/wiki/Keypunch

    The heart of the 024 and 026 keypunches was a set of twelve precision punches, one per card row, each with an actuator of relatively high power. Punch cards were stepped across the punch one column at a time, and the appropriate punches were activated to create the holes, resulting in a distinctive "chunk, chunk" sound as columns were punched.

  5. Knockout punch - Wikipedia

    en.wikipedia.org/wiki/Knockout_punch

    Chassis punches: assorted sizes round and square Chassis punches: assorted sizes round and square disassembled. In metalworking, a knockout punch, also known as a chassis punch, panel punch, Greenlee punch, or a Q-max, [1] is a hand tool used to punch a hole through sheet metal. It is a very simple tool that consists of a punch, die, and screw.

  6. Punching - Wikipedia

    en.wikipedia.org/wiki/Punching

    It is the most cost effective process of making holes in strip or sheet metal for average to high fabrication. It is able to create multiple shaped holes. Punches and dies are usually fabricated from conventional tool steel or carbides; It creates a burnished region roll-over, and die break on sidewall of the resulting hole. [1] It is a quick ...

  7. Punching machine - Wikipedia

    en.wikipedia.org/wiki/Punching_Machine

    A HACO CNC punching machine Punched hole: best results for cutting surface with above 70% cutting, low clearance necessary (8% material thickness) Punch presses are developed for high flexibility and efficient processing of metal stampings. The main areas of application are for small and medium runs.

  8. Punch (tool) - Wikipedia

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

    A drift "punch" is misleadingly named; it is not used as a punch in the traditional sense of the term. A drift punch, or drift pin, or lineup punch, is used as an aid in aligning bolt or rivet holes prior to inserting a fastener. A drift punch is constructed as a tapered rod, with the hammer acting on the large end of the taper.

  9. Punched tape - Wikipedia

    en.wikipedia.org/wiki/Punched_tape

    Most tape-punching equipment used solid circular punches to create holes in the tape. This process created " chad ", or small circular pieces of paper. Managing the disposal of chad was an annoying and complex problem, as the tiny paper pieces had a tendency to escape containment and to interfere with the other electromechanical parts of the ...

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