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  2. 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 .

  3. Friedrich Soennecken - Wikipedia

    en.wikipedia.org/wiki/Friedrich_Soennecken

    Hole punch. Ink container with stable stand (invented as an apprentice) A style of writing with the round tip of the feather of a pen nib (1860) An early type of binder which later became the Soennecken file (1886) The hole punch; The ring binder, later symbolically part of the logo of Soennecken

  4. 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.

  5. 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.

  6. Hole punch - Wikipedia

    en.wikipedia.org/wiki/Hole_punch

    A related office tool is the eyelet punch. This is a single-hole punch which also crimps a metal fastening loop around the hole, similar to a rivet. It is used to permanently secure a few sheets of paper together. A similar tool, generally known as a holing pincer, is used in animal husbandry.

  7. Circlip - Wikipedia

    en.wikipedia.org/wiki/Circlip

    A circlip (a portmanteau of "circle" and "clip"), also known as a C-clip, snap ring, or ', [1] is a type of fastener or retaining ring that consists of a semi-flexible metal ring with open ends that can be snapped into place into a machined groove on a dowel pin or other part to permit rotation but to prevent axial movement.

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