A set of drills operated together in the same machine; used in rock drilling.


Related Terms

PLUNGE

To set the horizontal cross hair of a theodolite in the direction of a grade when establishing a grade between two points of known level.

PIPE BOX

In a pipework installation, a casing packed with loose insulation to enclose a set of pipes.

PHOTOELECTRIC COLORIMETER

A colorimeter that uses a phototube or photocell, a set of color filters, an amplifier, and an indicating meter for quantitative determination of color.

PERMISSIBLE EXPOSURE LIMIT

The level of air contaminants that represents an acceptable exposure level as specified in standards set by a national government agency; generally expressed as 8-hour time-weighted average concentrations. Abbreviated PEL.

PART FAMILY

In the group technology concept, a set of related parts that can be produced by the same sequence of machining operations because of similarity in shape and geometry or similarity in production operation processes.

OSCILLATING GRANULATOR

Solids sizereducer in which particles are broken by a set of oscillating bars arranged in cylindrical form over a screen of suitable mesh.

OPEN CAISSON

A caisson in the form of a cylinder or shaft that is open at both ends; it is set in place, pumped dry, and filled with concrete.

ONSAGER RECIPROCAL RELATIONS

A set of conditions which state that the matrix, whose elements express various fluxes of a system (such as diffusion and heat conduction) as linear functions of the various conjugate affinities (such as mass and temperature gradients) for systems close to equilibrium, is symmetric when certain definitions are chosen for these fluxes and affinities.

OFFSET SCREWDRIVER

A screwdriver with the blade set perpendicular to the shank for access to screws in otherwise awkward places.

OCCUPY

To set a surveying instrument over a point for the purpose of making observations or measurements.

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