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A Swivel is a mechanical device used on a drilling rig that hangs directly under the traveling block and directly above the kelly drive, that provides the ability for the kelly (and subsequently the drill string) to rotate while allowing the traveling block to remain in a stationary rotational position (yet allow vertical movement up and down the derrick) while simultaneously allowing the ...
1912 – The Black and Decker "Hexagon" logo symbol was introduced, symbolizing the head of a hexagonal bolt found in machine shops. It was used in one form or another from 1912 to 2014. [6] 1917 – Black & Decker invented and patented the hand-held electric drill with a pistol grip and trigger switch. [3] [7]
It grew quickly and was reorganized and reincorporated in 1947 as DeWalt Inc. American Machine & Foundry Co., Inc. bought the company in 1949, and sold it to Black & Decker in 1960. Black & Decker divested itself of the radial arm saw manufacturing branch in 1989, selling it to two executives. In 1992, Black & Decker began a major effort to ...
Following this exercise, Steuben published his drill instructions in a manual that was published in 1779 and widely distributed throughout the Continental Army. This manual became commonly known as the army's "Blue Book". It remained the official U.S. military guide until 1812. [1]
Drill bit (#26) is a device attached to the end of the drill string that breaks apart the rock being drilled. It contains jets through which the drilling fluid exits. Drill floor (#21) is the area on the rig where the tools are located to make the connections of the drill pipe, bottom hole assembly, tools and bit. It is considered the main area ...
Drill commands are generally used with a group that is marching, most often in military foot drills or in a marching band. [ 1 ] [ 2 ] [ 3 ] Drill commands are usually heard in major events involving service personnel, reservists and veterans of a country's armed forces, and by extension, public security services and youth uniformed organizations.
A hand-held corded electric drill A lightweight magnetic-mount drill. A drill is a tool used for making round holes or driving fasteners. It is fitted with a bit, either a drill or driver chuck. Hand-operated types are dramatically decreasing in popularity and cordless battery-powered ones proliferating due to increased efficiency and ease of use.
Derrickman: The third in command after the driller & assistant driller; handles the top end of drill string on round trips. Dope: A thick lubricant used on pipe connections. Drill string: A column, or string, of pipe that transmits drilling fluid (via the mud pumps) and torque (from the Kelly drive or top drive) to the drill bit.
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