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  2. Angle grinder - Wikipedia

    en.wikipedia.org/wiki/Angle_grinder

    Generally, disc size and power increase together. 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.

  3. Metalworking - Wikipedia

    en.wikipedia.org/wiki/Metalworking

    The use of an angle grinder in cutting is not preferred as large amounts of harmful sparks and fumes (and particulates) are generated when compared with using reciprocating saw or band saw. [12] Angle grinders produce sparks when cutting ferrous metals.

  4. Unusual types of gramophone records - Wikipedia

    en.wikipedia.org/wiki/Unusual_types_of...

    Culture Club "Move Away" 5-inch picture disc, example of the 5-inch format resting on a 7-inch single for comparison. The most common diameter sizes for gramophone records are 12-inch, 10-inch, and 7-inch (300 mm, 250 mm, and 180 mm). [1]

  5. History of photographic lens design - Wikipedia

    en.wikipedia.org/wiki/History_of_photographic...

    Images from the 2009 Panasonic 14-140mm f/4-5.8 G VARIO ASPH. MEGA O.I.S. and the 2010 Olympus M. Zuiko Digital 14-150mm f/4-5.6 ED lenses (both Japan) have their severe barrel distortion at the wide angle settings automatically reduced by a Panasonic LUMIX DMC-GH1 and Olympus Pen E-P2, respectively. The Panasonic 14-140mm lens also has its ...

  6. Sheet metal - Wikipedia

    en.wikipedia.org/wiki/Sheet_metal

    The older United States Standard Gauge is based upon 40 lb per square foot per inch thick. Gauge is defined differently for ferrous (iron-based) and non-ferrous metals (e.g. aluminium and brass). The gauge thicknesses shown in column 2 (U.S. standard sheet and plate iron and steel decimal inch (mm)) seem somewhat arbitrary.

  7. Drill bit - Wikipedia

    en.wikipedia.org/wiki/Drill_bit

    The correct point angle for the hardness of the material influences wandering, chatter, hole shape, and wear rate. The lip angle is the angle between the face of the cut material and the flank of the lip, and determines the amount of support provided to the cutting edge. A greater lip angle will cause the bit to cut more aggressively under the ...

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