A shaft employed solely for the hoisting of workers and materials to and
from underground. Nelson
a. Fiber cord wrapping around the surface of a wire rope. Hammond
b. Corn. A supply of tin ready for smelting.
An automatic feedback control system for mechanical motion; it applies
only to those systems in which the controlled quantity or output is
mechanical position or one of its derivatives (velocity, acceleration, and
so on). Also known as servo system. McGraw-Hill, 1
a. A timber frame used for supporting the sides of an excavation, shaft,
or tunnel. Syn:sett
b. See:one-piece set; timber set; bench of timbers.
c. The distance a pile penetrates with one blow from a driving hammer.
Nichols, 1
d. A group of essentially parallel planar features, esp. joints, dikes,
faults, veins, etc. AGI
e. A train of mine cars; a trip. Fay
f. The failure of a rock subjected to intense pressure below the point of
rupture to recover its original form when the pressure is relieved.
Fay
g. The discharge opening of a crushing machine to regulate the size of the
largest escaping particle. Pryor, 2
h. To fix a prop or sprag in place.
i. To place a diamond in the crown of a bit. Long
j. To place casting in a borehole. Long
A bit insert with diamonds or other cutting media. Long
The cementing of casing in the hole. The cement is introduced between the
casing and the wall of the hole and then allowed to harden, thus sealing
off intermediate formations and preventing fluids from then entering the
hole. It is customary to set casing in the completion of a producing well.
Williams
A casing shoe set with diamonds. Often used for a one-shot attempt to
drill casing down through overburden to bedrock. Also called casing-shoe
bit. Long
An intermediate copper product containing about 3.5% cuprous oxide,
obtained at the end of the oxidizing portion of the fire-refining cycle.
ASM, 1
The minimum inside diameter of a set core bit. Usually written set i.d. in
drilling industry literature. Also called bore; center bore; inside gage.
Abbrev. set i.d. Long
The timbers composing any framing, whether used in a shaft, slope, level,
or gangway. Thus, the four pieces forming a single course in the curbing
of a shaft, or the three or four pieces forming the legs and collar, and
sometimes the sill, of an entry framing are together called a set, or
timber set. Zern
The maximum outside diameter of a set bit. Usually written set o.d. in
drilling industry literature. Also called outside gage. Abbrev. set o.d.
Long
A reaming shell, a portion of the outside surface of which has embedded
diamonds, diamond-inset inserts, or other cutting media, having a set
diameter slightly greater than the standard set size of the bit to which
the shell is coupled. Long
a. A quarryman's term for a square-faced steel tool held in position and
struck with a sledge to cause a fracture in a rock mass.
b. Corn. A lease; the boundaries and terms of the mining ground taken by
the adventurers. See also:set
c. A timber frame used in underground support. Also spelled set.
Pryor, 3
d. A small rectangular dressed stone of granite, quartzite, or whinstone,
used as road paving in localized areas subject to esp. heavy traffic.
Hammond
a. Those runners, sheeting, or poling boards which are held in place by
one pair of timber frames supporting the sides of an excavation.
See also:timbering; top frame. Hammond
b. The timber frames used at intervals in shaft sinking and close-poled
behind. Stauffer
c. See:heading
d. The act of contracting with miners for work to be done.
Standard, 2
Marking out on the ground by means of pegs and lines the proposed
positions and dimensions of earthworks, masonry, etc. Also called staking
out. Syn:laying out
The geometric arrangement of the inset diamonds in a bit crown.
Long
A cylindrical object, having a diameter equal to the inside set diameter
of a specific-size bit, used to measure the inside set diameter of a core
bit. Long
A ringlike sleeve, the inside diameter of which is the same as a specific
set outside diameter of a diamond bit or reaming shell; it is used to
check the set diameter of a bit or reaming shell. Also called bit gage;
bit ring; gage ring; gaging ring; ring gage; setting gage. Long
A special diamond-drill rod used to set a deflecting wedge in a borehole.
Long