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Stencil for the curves of y=x 2, y=tan(x), y=sin(x), and y= 1 / 2 sin(x). A geometry template is a piece of clear plastic with cut-out shapes for use in mathematics and other subjects in primary school through secondary school. It also has various measurements on its sides to be used like a ruler. In Australia, popular brands include ...
For US legal paper size (8 + 1 ⁄ 2 by 14 inches, 220 by 360 mm), a 4-hole system exists. It is still in use today, but is not as common as the 3-hole standard. The four holes are positioned symmetrically with centers 3 + 1 ⁄ 2 inches (89 mm) apart. The four binding positions provide more support for the longer 14-inch side of legal paper.
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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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 an impulse that drives the punch, producing ...
An aperture card is a type of punched card with a cut-out window into which a chip of microfilm is mounted. Such a card is used for archiving or for making multiple inexpensive copies of a document for ease of distribution.
Many laser printers can print on both sides of the paper (duplex printing), which is not possible with continuous stationery. Standard perforations are 5/32 inch in diameter (3.96875 mm, sometimes called 4 mm) and are spaced at 1 ⁄ 2 inch (13 mm) center-to-center. Tear-off horizontal perforations at page top/bottom are exactly in-between ...
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