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  2. Drill commands - Wikipedia

    en.wikipedia.org/wiki/Drill_commands

    Ground arms: Servicemen bring their rifles to the ground. Trail arms: Servicemen bring their grip from the pistol grip to the carrying handle of the rifle in order to carry the rifle horizontally; Sling arms: If the soldiers have a "sling" (strap) on their rifles, then this command can be called. The soldiers will loosen the sling so they can ...

  3. Pershing Rifles - Wikipedia

    en.wikipedia.org/wiki/Pershing_Rifles

    Sanford, North Carolina 27330. United States. Website. www.pershingriflessociety.org. The National Society of Pershing Rifles is a US military-oriented honor society for college-level students founded in 1894 as a drill unit at the University of Nebraska–Lincoln. It is the oldest continuously operating US college organization dedicated to ...

  4. Rack and pinion - Wikipedia

    en.wikipedia.org/wiki/Rack_and_pinion

    The rack and pinion mechanism is used in rack railways, where the pinion mounted on a locomotive or a railroad car engages a rack usually placed between the rails, and helps to move the train up a steep gradient. It is also used in arbor presses and drill presses, where the pinion is connected to a lever and displaces a vertical rack (the ram).

  5. Shear modulus - Wikipedia

    en.wikipedia.org/wiki/Shear_modulus

    G = τ / γ = E / [2 (1 + ν)] Shear strain. In materials science, shear modulus or modulus of rigidity, denoted by G, or sometimes S or μ, is a measure of the elastic shear stiffness of a material and is defined as the ratio of shear stress to the shear strain: [1] where. = shear stress. is the force which acts. is the area on which the force ...

  6. Gear - Wikipedia

    en.wikipedia.org/wiki/Gear

    Gear. Two intermeshing spur gears rotating at different velocity due to differing gear ratio. A gear[1][2] or gearwheel[3][4][5] is a rotating machine part typically used to transmit rotational motion and/or torque by means of a series of teeth that engage with compatible teeth of another gear or other part.

  7. SOPMOD - Wikipedia

    en.wikipedia.org/wiki/SOPMOD

    SOPMOD. The Special Operations Peculiar MODification (SOPMOD) kit is an accessory system for the M4A1 carbine, CQBR, FN SCAR Mk 16/17, HK416 and other weapons used by United States Special Operations Command (USSOCOM) special forces units, though it is not specific to SOCOM. The kit allows US Special Operations Forces (US SOF) personnel to ...

  8. Tunnel boring machine - Wikipedia

    en.wikipedia.org/wiki/Tunnel_boring_machine

    Tunnel boring machine. A tunnel boring machine (TBM), also known as a "mole" or a "worm", is a machine used to excavate tunnels. Tunnels are excavated through hard rock, wet or dry soil, or sand, each of which requires specialized technology. Tunnel boring machines are an alternative to drilling and blasting (D&B) methods and "hand mining".

  9. Annular cutter - Wikipedia

    en.wikipedia.org/wiki/Annular_cutter

    An annular cutter (also called a core drill, core cutter, broach cutter, trepanning drill, hole saw, or cup-type cutter) is a form of core drill used to create holes in metal. An annular cutter, named after the annulus shape, cuts only a groove at the periphery of the hole and leaves a solid core or slug at the center. [1]

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