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An exploded view of an automatic center punch. An automatic center punch is a hand tool used to produce a dimple in a workpiece (for example, a piece of metal). It performs the same function as an ordinary center punch but without the need for a hammer. When pressed against the workpiece, it stores energy in a spring, eventually releasing it as ...
On the other end, a cone shape is also spring-loaded and is used to locate the center of a previously drilled hole. This style of edge finder is considered to be the most accurate, and its accuracy can be further improved through the use of a collet. In proper setups, a repeatability of 0.0002 in (0.0051 mm) or better can be obtained.
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 ...
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The punch also needs to be high enough to accommodate the height of the resulting box's sides. Corrugating dies—Such dies have a wavy surface and may involve spring-loaded punch elements. Multiple-bend dies—A die set may be built in the shape of the desired profile and form several bends on a single stroke of the press.
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