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2. Punch (tool) - Wikipedia

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

   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] When drilling larger holes, where the drill bit is wider than the indentation produced by a center punch, the drilling of a pilot hole is usually needed. An automatic center punch operates without the ...

3. Drift pin - Wikipedia

   en.wikipedia.org/wiki/Drift_pin

   In metalworking, a drift pin, drift pin punch, simply drift, is the name for a tool used for localizing a hammer blow. A drift is smaller in diameter than the hammer face, thus concentrating the force into a smaller area. A drift is also used where the surrounding surfaces need to be protected from the hammer blow.

4. Power tool - Wikipedia

   en.wikipedia.org/wiki/Power_tool

   Early Industrial Revolution-era factories had batteries of power tools driven by belts from overhead shafts. The prime power source was a water wheel or (later) a steam engine. The introduction of the electric motor (and electric distribution networks) in the 1880s made possible the self-powered stationary and portable tools we know today. [ 19 ]

5. Automatic center punch - Wikipedia

   en.wikipedia.org/wiki/Automatic_center_punch

   The hammer has a hole through its center that the top of the punch sits in, and holds the top of the punch centered. The sliding block has a hole through it that, when reset, is misaligned with the hole through the hammer. When the body is pressed to the trip point, a taper in the body forces the block sideways until the hole in the block is ...

6. Knockout punch - Wikipedia

   en.wikipedia.org/wiki/Knockout_punch

   Chassis punches: assorted sizes round and square Chassis punches: assorted sizes round and square disassembled. 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.

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