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A standard channel letter is a three-dimensional graphic sign element. Its channel is fabricated from sheet metal, most often aluminum since it will not rust. A flat sheet of aluminum is typically cut on a table by a computer-controlled router, laser, or water jet, based on a vector-based art file (.cdr, .eps, .ai, .scv, .sci, or .fs).
The tape is packaged in a special, pre-formatted DC150 miniature cartridge consisting of a clear plastic cover mounted on a textured aluminum plate. Cartridge dimensions are 2 + 3 ⁄ 8 by 3 + 3 ⁄ 16 by 1 ⁄ 2 inch (60 mm × 81 mm × 13 mm).
The Sentinel Chromatron recorded on a single side of uncoated aluminum; its records were read with a fibre needle. It was "rather unstable technology" which produced poor sound quality in comparison to shellac records and was rarely used after 1935. [1] RCA Victor introduced home phonograph disk recorders in October 1930.
Curiously, uncut test pressings of shaped discs in their original 12-inch form – with the clear vinyl surrounds still intact – are much more sought-after by collectors than the "regular" shapes themselves. [48] Shaped picture discs were first manufactured in the late 1970s for promotional purposes.
As of the 2013 season, the NCAA has passed a rule stating that shooting strings are limited to an area within a 4-inch (10 cm) arc drawn from the top of the plastic of the scoop. This essentially eliminates U- or V-shaped shooting strings, as they almost always cross below the 4-inch (10 cm) line. The pocket depth is governed by rule as well.
There is a variation on T-slot profiles known as V-slot rails where V-slot wheels are slotted into the V-shaped channels of the framing for linear motion in a 3D printer or other CNC machine. Profiles