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  2. Gauge block - Wikipedia

    en.wikipedia.org/wiki/Gauge_block

    Gauge blocks (also known as gage blocks, Johansson gauges, slip gauges, or Jo blocks) are a system for producing precision lengths. The individual gauge block is a metal or ceramic block that has been precision ground and lapped to a specific thickness. Gauge blocks come in sets of blocks with a range of standard lengths.

  3. Machinist square - Wikipedia

    en.wikipedia.org/wiki/Machinist_square

    - DIN 875-1 (German/Euro standards). Under both these standards there are basic dimensions set out for blade/body length ratio, and cross sections of both, as well as different types of squares such as those with a solid body and an inserted blade, or those with a single piece blade and body being precision ground with another plate attached to ...

  4. List of body armor performance standards - Wikipedia

    en.wikipedia.org/wiki/List_of_body_armor...

    The VPAM scale as of 2009 runs from 1 to 14, with 1-5 being soft armor, and 6-14 being hard armor. [1] Tested armor must withstand three hits, spaced 120 mm (4.7 inches) apart, of the designated test threat with no more than 25 mm (0.98 inches) of back-face deformation in order to pass.

  5. List of DIN standards - Wikipedia

    en.wikipedia.org/wiki/List_of_DIN_standards

    DIN 125-1: Product grade A washers – with a hardness up to 250 HV designed for use with hexagon head bolts and nuts: Withdrawn: DIN EN ISO 7089, DIN EN ISO 7090: ISO 7089, ISO 7090: DIN 125-2: Product grade A washers – with a hardness up to 300 HV designed for use with hexagon head bolts and nuts: Withdrawn: DIN EN ISO 7089, DIN EN ISO 7090 ...

  6. Metrology - Wikipedia

    en.wikipedia.org/wiki/Metrology

    A gauge block is a block of metal or ceramic with two opposing faces ground precisely flat and parallel, a precise distance apart. [31] The length of the path of light in vacuum during a time interval of 1/299,792,458 of a second is embodied in an artefact standard such as a gauge block; this gauge block is then a primary standard which can be ...

  7. Surface plate - Wikipedia

    en.wikipedia.org/wiki/Surface_plate

    A common problem is wear to particular areas, such as that caused by the frequent use of a tool in one place (such as a height gauge), that causes an uneven surface and reduces overall accuracy of the plate, this may be greatly accelerated if abrasive dust is present. Tools and workpieces may also cause damage when dropped on the surface plate.

  8. Puzzle solutions for Saturday, Nov. 30, 2024

    www.aol.com/news/puzzle-solutions-saturday-nov...

    Note: Most subscribers have some, but not all, of the puzzles that correspond to the following set of solutions for their local newspaper. CROSSWORDS

  9. Airy points - Wikipedia

    en.wikipedia.org/wiki/Airy_points

    "End standards", that is standards whose length is defined as the distance between their flat ends such as long gauge blocks or the mètre des Archives, must be supported at the Airy points so that their length is well-defined; if the ends are not parallel, the measurement uncertainty is increased because the length depends on which part of the ...

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