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  2. Bush hammer - Wikipedia

    en.wikipedia.org/wiki/Bush_hammer

    A bush-hammered concrete surface. Bush hammers exist in many forms, from simple hand-held hammers to large electric machines, but the basic functional property of the tool is always the same – a grid of conical or pyramidal points at the end of a large metal slug.

  3. Drill bushing - Wikipedia

    en.wikipedia.org/wiki/Drill_bushing

    A drill bushing, also known as a jig bushing, [1] is a tool used in metalworking jigs to guide cutting tools, most commonly drill bits. Other tools that are commonly used in a drill bushing include counterbores, countersinks, and reamers. They are designed to guide, position, and support the cutting tool. [2]

  4. Hardness comparison - Wikipedia

    en.wikipedia.org/wiki/Hardness_comparison

    Hardness Conversion Table – Brinell, Rockwell,Vickers – Various steels . (Archived) (archived November 11, 2011) Rockwell to Brinell conversion chart (Brinell, Rockwell A,B,C)

  5. Piping and plumbing fitting - Wikipedia

    en.wikipedia.org/wiki/Piping_and_plumbing_fitting

    A double-tapped bushing, commonly shortened to bushing, is a fitting which serves as a reducer. It is a sleeve similar to a close nipple, but is threaded on both its inner and outer circumferences. Like a reducer, a double-tapped bushing has two threads of different sizes.

  6. Powder-actuated tool - Wikipedia

    en.wikipedia.org/wiki/Powder-actuated_tool

    Not all powder-actuated tools are rated for high-capacity charges—the strongest charge (nickel-purple at 1,295 ft/s (395 m/s)), for example, is dangerous in a tool not rated for the high pressures it generates. The table above is for a 350-grain (23 g) slug from a test device. [citation needed]

  7. Bushing - Wikipedia

    en.wikipedia.org/wiki/Bushing

    Bushing (bearing), a type of plain bearing; Bushing (electrical), an insulated device that allows a conductor to pass through a grounded conducting barrier; Bushing (isolator), a mechanical device used to reduce vibrational energy transfer between two parts; Drill bushing, a tool used to guide the placement of a hole when drilling in a workpiece

  8. Engineering fit - Wikipedia

    en.wikipedia.org/wiki/Engineering_fit

    Engineering fits are generally used as part of geometric dimensioning and tolerancing when a part or assembly is designed. In engineering terms, the "fit" is the clearance between two mating parts, and the size of this clearance determines whether the parts can, at one end of the spectrum, move or rotate independently from each other or, at the other end, are temporarily or permanently joined.

  9. Formwork - Wikipedia

    en.wikipedia.org/wiki/Formwork

    Formwork tables in use at a building site with more complicated structural features. Crane fork or elevator handled: By this approach the tables are limited in size and weight. Typical widths are between 6 and 10 feet (1.8 and 3.0 m), typical lengths are between 12 and 20 feet (3.7 and 6.1 m), though table sizes may vary in size and form.

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