Center punch
editA center punch[1] is a tool that is used to guide a drill into a desired hole. This tool is typically made of a hard metal, Steel, with a tempered or hardened point to withstand the impact of being pushed into other metals[2]. A center punch is usually shaped as an extruded circle or hexagon with a rounded tip. The center punch can come in a variety of strengths and usually with a pitch angle of 60 or 90 degrees. This tool is to be placed with the end in the desired position and then hit with a hammer on the top. The small indention made can now be used to drill a pilot hole or a complete hole through a work piece.
Use
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Center punches are used in to generate a small indention to keep a drill bit from wandering when starting a hole. When using a center punch the use of a ball pein hammer is the most effective striking tool[2]. When punching, adequate force is needed to generate a good starting point for the drill. Human error often requires more than one strike to achieve an acceptable punch.
Automatic Center Punch
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The automatic center punch was patented in 1945[3], and makes an adequate indention without the use of a hammer[4]. The automatic center punch stores energy in a spring when pressed on the surface of a work piece. When the maximum amount of energy storage is reached, the spring releases and forces the point into the work piece. This is more accurate and more precise than the center punch because the punching pressure is always constant and human error is decreased.
- ^ "Definition of CENTER PUNCH". www.merriam-webster.com. Retrieved 2020-06-12.
- ^ a b "The Centre and Dot Punch". www.technologystudent.com. Retrieved 2020-06-12.
- ^ [1], "Automatic center punch", issued 1942-09-29
- ^ "Automatic center punch", Wikipedia, 2017-08-22, retrieved 2020-06-12