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2. Shaft collar - Wikipedia

   en.wikipedia.org/wiki/Shaft_collar

   The two-piece design provides greater clamping force than a single piece clamp because all of the force is transferred directly into clamping the shaft. Also, the two piece collar has double the amount of screws the one piece has. In single piece designs, the non-tightened side provides negative force, as it must hold the collar open to allow ...

3. Bottom hole assembly - Wikipedia

   en.wikipedia.org/wiki/Bottom_hole_assembly

   Rotary assemblies [2] are commonly used where formations are predictable and the rig economics are an issue. In such an assembly the weight of the drill collars gives the BHA the tendency to sag or flex to the low side of the hole, collar stiffness length and stabiliser diameter and placement are engineered as a means of controlling the flex of the BHA.

4. List of components of oil drilling rigs - Wikipedia

   en.wikipedia.org/wiki/List_of_components_of_oil...

   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 where work is performed. Drill line (#12) is thick, stranded metal cable threaded through the two blocks (traveling and crown) to raise and lower the drill string.

5. Drill string - Wikipedia

   en.wikipedia.org/wiki/Drill_string

   Drill pipe makes up the majority of the drill string back up to the surface. Each drill pipe comprises a long tubular section with a specified outside diameter (e.g. 3 1/2 inch, 4 inch, 5 inch, 5 1/2 inch, 5 7/8 inch, 6 5/8 inch). At each end of the drill pipe, tubular larger-diameter portions called the tool joints are located.

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7. Testing time: Trump’s blue-collar voters want quick proof ...

   www.aol.com/testing-time-trump-blue-collar...

   Daybreak on the Atlantic is a slow, hypnotic explosion of color. Black skies turn ash gray; next, a sideways sliver of orange divides the vast horizon.