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  2. Rotary steerable system - Wikipedia

    en.wikipedia.org/wiki/Rotary_steerable_system

    The first known patent application is from Christopher G. Cross in 1873 for "Drills for Boring Artesian Wells", [1] followed in 1884 by the brothers Morris and Clarence Baker for a "Machine for Operating Drills" [2] The methods used to direct the well path fall into two broad categories, these being “push-the-bit” or “point-the-bit ...

  3. Threaded insert - Wikipedia

    en.wikipedia.org/wiki/Threaded_insert

    TIME-SERT insert. A threaded insert, also known as a threaded bushing, is a fastener element that is inserted into an object to add a threaded hole. [1] They may be used to repair a stripped threaded hole, provide a durable threaded hole in a soft material, place a thread on a material too thin to accept it, mold or cast threads into a work piece thereby eliminating a machining operation, or ...

  4. Rotary encoder - Wikipedia

    en.wikipedia.org/wiki/Rotary_encoder

    An absolute encoder maintains position information when power is removed from the encoder. [5] The position of the encoder is available immediately on applying power. The relationship between the encoder value and the physical position of the controlled machinery is set at assembly; the system does not need to return to a calibration point to maintain position accuracy.

  5. Rotating reference frame - Wikipedia

    en.wikipedia.org/wiki/Rotating_reference_frame

    A rotating frame of reference is a special case of a non-inertial reference frame that is rotating relative to an inertial reference frame. An everyday example of a rotating reference frame is the surface of the Earth. (This article considers only frames rotating about a fixed axis. For more general rotations, see Euler angles.)

  6. Hertel & Reuss - Wikipedia

    en.wikipedia.org/wiki/Hertel_&_Reuss

    Hertel & Reuss was a manufacturer of optical instruments based in Kassel, Germany, which emerged around 1995 following the bankruptcy of its predecessor company (founded in 1927 by Otto Hertel and Eduard Reuss.) The owners of Hertel & Reuss KG were Herr Eduard Reuss and his two sons Herr Gerhard Reuss and Herr Helmut Reuss.

  7. Internal rotary inspection system - Wikipedia

    en.wikipedia.org/wiki/Internal_rotary_inspection...

    Internal rotary inspection system (IRIS) is an ultrasonic method for the nondestructive testing of pipes and tubes.The IRIS probe is inserted into a tube that is flooded with water, and the probe is pulled out slowly as the data is displayed and recorded.

  8. Thermal wheel - Wikipedia

    en.wikipedia.org/wiki/Thermal_Wheel

    Diagramatic operation of a thermal wheel Ljungström Air Preheater by Swedish engineer Fredrik Ljungström (1875–1964). A thermal wheel, also known as a rotary heat exchanger, or rotary air-to-air enthalpy wheel, energy recovery wheel, or heat recovery wheel, is a type of energy recovery heat exchanger positioned within the supply and exhaust air streams of air-handling units or rooftop ...

  9. Quaternions and spatial rotation - Wikipedia

    en.wikipedia.org/wiki/Quaternions_and_spatial...

    3D visualization of a sphere and a rotation about an Euler axis (^) by an angle of In 3-dimensional space, according to Euler's rotation theorem, any rotation or sequence of rotations of a rigid body or coordinate system about a fixed point is equivalent to a single rotation by a given angle about a fixed axis (called the Euler axis) that runs through the fixed point. [6]