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  2. Hole punch - Wikipedia

    en.wikipedia.org/wiki/Hole_punch

    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).

  3. Punch (tool) - Wikipedia

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

    A center punch is used to mark the center of a point. It is usually used to mark the center of a hole when drilling holes. A drill has the tendency to "wander" if it does not start in a recess. A center punch forms a large enough dimple to "guide" the tip of the drill. The tip of a center punch has an angle between 60 and 90 degrees. [1]

  4. Punching - Wikipedia

    en.wikipedia.org/wiki/Punching

    Punching. Extruded holes with the punch and die used to create them. No pilot hole was used on the left. Punching is a forming process that uses a punch press to force a tool, called a punch, through the workpiece to create a hole via shearing. Punching is applicable to a wide variety of materials that come in sheet form, including sheet metal ...

  5. Knockout punch - Wikipedia

    en.wikipedia.org/wiki/Knockout_punch

    Knockout punch. 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. There are three different drive systems: manual, ratchet, and hydraulic.

  6. Types of press tools - Wikipedia

    en.wikipedia.org/wiki/Types_of_press_tools

    Blanking is the operation of cutting flat shapes from sheet metal. The outer area of metal remaining after a blanking operation is generally discarded as waste. Size of blank or product is the size of the die & clearance is given on punch. It is a metal cutting operation. In blanking, metal obtained after cutting is not a scrap if it is usable.

  7. Automatic center punch - Wikipedia

    en.wikipedia.org/wiki/Automatic_center_punch

    An automatic center punch is a hand tool used to produce a dimple in a workpiece (for example, a piece of metal). It performs the same function as an ordinary center punch but without the need for a hammer. When pressed against the workpiece, it stores energy in a spring, eventually releasing it as an impulse that drives the punch, producing ...

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