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2. Knockout punch - Wikipedia

   en.wikipedia.org/wiki/Knockout_punch

   The screw is then threaded into the punch and the screw tightened until the punch is drawn completely through the sheet metal. [2] The manual system uses a screw that has a standard hex head or square head and is driven using an allen key or wrench. A manual knockout punch can handle holes from 0.5 to 1.25 in (13 to 32 mm).

3. Hole punch - Wikipedia

   en.wikipedia.org/wiki/Hole_punch

   The essential parts of a hole punch are the handle, the punch head, and the die. The punch head is typically a cylinder, with a flat end called the face. The die is a flat plate, with a hole matching the head. The head can move, while the die is fixed in place. Both head and die are usually made of a hard metal, with precise tolerances. One or ...

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.

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6. Automatic center punch - Wikipedia

   en.wikipedia.org/wiki/Automatic_center_punch

   The punch; The intermediate rod (tumbler) The hammer (hammer mass) The hammer mass is spring-loaded from the back of the punch by a large spring. (The spring's preload compression can usually be adjusted by loosening or tightening the end cap at the back-most portion of the punch, to decrease or increase the force of the punch.)

7. Punch (tool) - Wikipedia

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

   A prick punch is similar to a center punch but used for marking out. It has a sharper angled tip to produce a narrower and deeper indentation. The indentation can then be enlarged with a center punch for drilling. The tip of a prick punch is 60 degrees (the angle depends on what type of prick punch one is using). [1] It is also known as a dot ...