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A cutting-pattern, often called just pattern, is an arrangement of small rectangles on the stock sheet. It may be given as a sequence of points (x i,y i), for i in 1,...,m, where (x i,y i) is the bottom-left coordinate of rectangle i. In such a pattern, rectangle i occupies a horizontal segment (x i, x i +w i) and a vertical segment (y i, y i ...
The edges of the hole may be flanged to increase the rigidity and strength of the component. [1] The holes can be circular, triangular, elliptical, or rectangular and should have rounded edges, but they should never have sharp corners, to avoid the risk of stress risers, and they must not be too close to the edge of a structural component. [2] [3]
The zax (also called a sack or sax [6]) is a hand tool for cutting, trimming, and punching nail holes in slate. It consists of a heavy rectangular knife blade with a large point, of square cross section, protruding from the poll (or butt). The blade edge is used to split slate, while the point is used to pierce square holes for mounting the ...
the mortise hole, and; the tenon tongue. The tenon, formed on the end of a member generally referred to as a rail, fits into a square or rectangular hole cut into the other, corresponding member. The tenon is cut to fit the mortise hole exactly. It usually has shoulders that seat when the joint fully enters the mortise hole.
A single-cut file has one set of parallel teeth while a cross-cut or double-cut file has a second set of cuts forming diamond shaped cutting surfaces. [1] In Swiss-pattern files the teeth are cut at a shallower angle, and are graded by number, with a number 1 file being coarser than a number 2, etc.
The process of perforating metal sheets has been practiced for over 150 years. In the late 19th century, metal screens were used as an efficient means of separating coal. The first perforators were laborers who would manually punch individual holes into the metal sheet. This proved to be an inefficient and inconsistent method which led to the ...