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For long straight cuts on sheet metal or for light cut-off work, a standard circular saw is used with a 7 + 1 ⁄ 4-inch cutting wheel. These cutting discs are made just like the smaller wheels of an angle grinder, with resin bonded abrasive material, or are of metal with a diamond-coated edge.
If there was no such notation, an outside start was assumed. Beginning in the mid-1950s, some transcription discs started employing the "microgroove" groove dimensions used by the 12- and 10-inch 33 + 1 ⁄ 3 rpm vinyl LP records introduced for home use in 1948. This allowed 30 minutes to fit comfortably on each side of a 16-inch disc.
Most noticeably, vinyl records are comparatively lightweight and flexible, while lacquers are rigid and considerably heavier because of their metal cores. Lacquers commonly come in three sizes: 10-inch (25 cm) discs for singles and 14-inch (36 cm) discs for albums as well as 12-inch (30 cm) discs for LP references and for 10" master cuts.
Disc size is usually measured in inches or millimeters. Common disc sizes for angle grinders in the United States include 4, 4.5, 5, 6, 7, 9 and 12 inches, with the most popular sizes being the 4.5 and 5" size. In Europe, the most common sizes for angle grinder discs are 115 and 125 millimeters. Discs for pneumatic grinders are much smaller.
Three vinyl records of different formats, from left to right: a 12 inch LP, a 10 inch LP, a 7 inch single. A phonograph record (also known as a gramophone record, especially in British English) or a vinyl record (for later varieties only) is an analog sound storage medium in the form of a flat disc with an inscribed, modulated spiral groove.
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