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  2. Surface roughness - Wikipedia

    en.wikipedia.org/wiki/Surface_roughness

    If these deviations are large, the surface is rough; if they are small, the surface is smooth. ... 0.8 32 35.2 32 4 N5 0.4 16 17.6 16 2 N4 0.2 8 8.8 8 1.2 N3 0.1 4 4. ...

  3. Preferred metric sizes - Wikipedia

    en.wikipedia.org/wiki/Preferred_metric_sizes

    Shelf where the shelf bearing holes are placed with 32 mm distances from center to center, giving flexible choices for shelve positioning.. System 32 is a standard for the design and manufacture of furniture, most commonly used in the design of cabinets, wherein the major parts (sides, doors, etc.) are available in increments of 32 mm, and shelf supports consist of columns of 5 mm holes on 32 ...

  4. Lumber - Wikipedia

    en.wikipedia.org/wiki/Lumber

    In 1961, at a meeting in Scottsdale, Arizona, the Committee on Grade Simplification and Standardization agreed to what is now the current U.S. standard: in part, the dressed size of a 1-inch (nominal) board was fixed at 3 ⁄ 4 inch; while the dressed size of 2 inch (nominal) lumber was reduced from 1 + 5 ⁄ 8 inch to the current 1 + 1 ⁄ 2 inch.

  5. List of unusual units of measurement - Wikipedia

    en.wikipedia.org/wiki/List_of_unusual_units_of...

    [25] [26] The standard FIFA football pitch for international matches is 105 m (344 ft) long by 68 m (223 ft) wide (7,140 m 2 or 0.714 ha or 1.76 acres); FIFA allows for a variance of up to 5 m (16.4 ft) in length in either direction and 7 m (23.0 ft) more or 4 m (13.1 ft) less in width (and larger departures if the pitch is not used for ...

  6. Double margin doors - Wikipedia

    en.wikipedia.org/wiki/Double_margin_doors

    It is used for door openings that are too wide for a single door but where a pair of doors would be difficult for people to manoeuvre past. An example of a double margin door can be seen at the entrance to 10 Downing Street. A bench joiner will need to be aware of the correct procedure for assembly of this type of door. Firstly he will glue and ...

  7. Shewhart individuals control chart - Wikipedia

    en.wikipedia.org/wiki/Shewhart_individuals...

    The value 2.66 is obtained by dividing 3 by the sample size-specific d 2 anti-biasing constant for n=2, as given in most textbooks on statistical process control (see, for example, Montgomery [2]: 725 ).