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2. Knockout punch - Wikipedia

   en.wikipedia.org/wiki/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. [2]

3. 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 ...

4. 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.

5. Punch press - Wikipedia

   en.wikipedia.org/wiki/Punch_press

   A punch press is a type of machine press used to cut holes in material. It can be small and manually operated and hold one simple die set, or be very large, CNC operated, with a multi-station turret and hold a much larger and complex die set.

6. 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 ...

7. Halligan bar - Wikipedia

   en.wikipedia.org/wiki/Halligan_bar

   Another variant has an end that resembles a lever-type can opener, used for making large holes for access or ventilation in sheet metal. The Halligan is available in a number of lengths – typically 18–54 inches (46–137 cm) – and of various materials, including titanium , beryllium copper or stainless steel .