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In a drilling operation,the weight placed on a bit that will cause the drill string to become resonant with the angular speed at which the rotating shaft is operating.



Related Terms

FEED PRESSURE

Total weight or pressure, expressed in pounds or tons, applied to the drilling stem to make the drill bit cut and penetrate the geologic, rock, or ore formation.

CENTRIFUGAL TACHOMETER

An instrument which measures the instantaneous angular speed of a shaft by measuring the centrifugal force on a mass rotating with it.

CROSS BOX

A boxlike structure for the connection of circulating tubes to the longi The angular speed at which a rotating shaft becomes dynamically unstable with large lateral amplitudes, due to resonance with the natural frequencies of lateral vibration of the shaft.

MEAN MOTION

In undisturbed elliptic motion, the constant angular speed required for a body of a specified mass to complete one revolution in an orbit of a specified semimajor axis.

DRILLING TIME

  1. The time required in rotary drilling for the bit to penetrate a specified thickness (usually 1 foot) of rock. 2. The actual time the drill is operating.

GEAR RATIO

The ratio of the angular speed of the driving member of a gear train or similar mechanism to that of the driven member; specifically, the number of revolutions made by the engine per revolution of the rear wheels of an automobile.

DRILL STRING

The assemblage of drill rods, core barrel, and bit, or of drill rods, drill collars, and bit in a borehole, which is connected to and rotated by the drill collar of the borehole.

DRILL ROD

The long rod that drives the drill bit in drilling boreholes.

HAND FEED

A drill machine in which the rate at which the bit is made to penetrate the rock is controlled by a hand-operated ratchet and lever or a hand-turned wheel meshing with a screw mechanism.

BENDIX-WEISS UNIVERSAL JOINT

A universal joint that provides for constant angular velocity of the driven shaft by transmitting the torque through a set of four balls lying in the plane that contains the bisector of, and is perpendicular to, the plane of the angle between the shafts.

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