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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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Three different international-standard two-hole punches. A hole punch, also known as hole puncher, or paper puncher, is an office tool that is used to create holes in sheets of paper, often for the purpose of collecting the sheets in a binder or folder (such collected sheets are called loose leaves).
Fiskars Group (natively Fiskars Oyj Abp, formerly Fiskars Oy Ab until 1998), [3] is a Finnish consumer goods company founded in 1649 in Fiskars, a locality now in the town of Raseborg, Finland, about 100 kilometres (62 mi) west of Helsinki. It is one of the oldest continuously operating companies in the World.
Punches are available in various shape and sizes; oblong and rectangular punches are common because they minimize waste and allow for greater distances between strokes, as compared to a round punch. Nibbling can occur on the exterior or interior of the material, however interior cuts require a hole to insert the tool.
A center punch is used to mark the center of a point. It is usually used to mark the center of a hole when drilling holes. A drill has the tendency to "wander" if it does not start in a recess. 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]
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A push dagger (alternately known as a punch dagger, punch knife, push knife or, less often, a push dirk) is a short-bladed dagger with a "T" handle designed to be grasped and held in a closed-fist hand so that the blade protrudes from the front of the fist, either between the index and middle fingers or between the two central fingers, when the grip and blade are symmetrical.
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