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2. Punch (tool) - Wikipedia

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

   Roll pin punches are designed with a small projection in the center of the pin tip to support the circumference of the roll pin. The tips of roll pin punches are not flat and should never be used on regular solid pins. If a roll pin punch is used on a solid pin, it will mar or mark the pin. If the end of a roll pin punch is damaged or deformed ...

3. Spring pin - Wikipedia

   en.wikipedia.org/wiki/Spring_pin

   A spring pin (also called tension pin or roll pin) is a mechanical fastener that secures the position of two or more parts of a machine relative to each other. Spring pins have a body diameter which is larger than the diameter of the hole they are intended for, and a chamfer on either one or both ends to facilitate starting the pin into the hole.

4. Automatic center punch - Wikipedia

   en.wikipedia.org/wiki/Automatic_center_punch

   Green is punch, red is hammer, and blue is trigger slide block. The Adell and Starrett mechanism uses a sliding block crosswise through the hammer rather than an intermediate pin. The hammer has a hole through its center that the top of the punch sits in, and holds the top of the punch centered.

5. 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.

6. The best stocking stuffers for men, from tools to Tile Mates

   www.aol.com/lifestyle/best-stocking-stuffers-for...

   The Saker Mini Chainsaw is exactly what it looks like: a pint-sized chainsaw that packs a punch at a bargain of a price. Packed with 550 watts of power and a 20V 1500mAh rechargeable lithium ...

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