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While many manufacturers measure IBO speeds using a draw weight of 70 lbf (310 N) and draw length of 30 in (76 cm), the IBO standard allows a draw weight of as high as 80 ± 2 lbf (355.9 ± 8.9 N), and does not specify a draw length. [8]
At full draw the distance in inches from nock point on bow string to deepest grip spot (pivot-point) plus 1 + 3 ⁄ 4 inches (44 mm) (ATA standard). Bow: characteristic measure of the bow together with its draw weight. The technically given optimal draw length for full draw of that bow (ATA standard). Draw weight of a bow means weight at its ...
Drawing is classified into two types: sheet metal drawing and wire, bar, and tube drawing. Sheet metal drawing is defined as a plastic deformation over a curved axis. For wire, bar, and tube drawing, the starting stock is drawn through a die to reduce its diameter and increase its length.
French curve – Template made from metal, wood or plastic composed of segments of smooth curves; Lesbian rule – Flexible strip of lead for use in molding; Technical drawing tool – Tools and instruments used for accurate and precise manual drafting; Spline (mathematics) – piecewise polynomial curves that smoothly interpolate points
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Before drawing, the draw plate is held securely in a vise or other fixture. The plate is oriented so that the wider end of a tapered opening can receive a metal wire which is to be pulled through it. Annealed soft, ductile wire is filed at one end to give it an initial taper.
Hydroforming is capable of producing parts within tight tolerances including aircraft tolerances where a common tolerance for sheet metal parts is within 0.76 mm (1/30th of an inch). Metal hydroforming also allows for a smoother finish as draw marks produced by the traditional method of pressing a male and female die together are eliminated.
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