a. To sink a borehole into solid or unconsolidated rock material, such as
overburden or glacial till, to a considerable depth below the bottom of
the casing or drivepipe. Long
b. To restart or resume drilling operation. Long
c. To drill boreholes in advance of mine workings to explore for or locate
old mine workings or a water-bearing formation. Long
A drill column that is set horizontally instead of vertically in an
underground workplace. See also:bar; drill column. Long
Metal or wood framework on which a drilling machine is mounted.
Long
a. One of a number of different types of detachable cutting tools used to
cut circular holes in rock, wood, metal, etc. Also called drill crown in
Africa and England. Long
b. Any device at the lower end of a drill stem, used as a cutting or
boring tool in drilling a hole; the cutting edge of a drill.
CF:core bit
An adjustable arm projecting from a drill carriage to carry a drill and
hold it in position. BS, 12
See:drill diamond
See:bypass
In a strict sense, the term should only be used to designate the heavy
rope or cable used as the connecting link between the drill stem and the
walking beam on a churn drill. However, the term now is commonly used to
signify any cable or wire rope used in hoisting drill rods, casing, and
other borehole-drilling equipment used with a drill machine, such as a
calyx drill, diamond drill, etc. Also called drilling line; drill line.
Long
The lineal feet of drill rod of a specified size that a hoist on a diamond
or rotary drill can lift or that the associated brake is capable of
holding on a single line; also sometimes used to designate the size of a
drill machine, based on the depth to which it is capable of drilling.
See also:lifting capacity
A movable platform, stage, or frame that incorporates several rock drills
and usually travels on the tunnel track; used for heavy drilling work in
large tunnels. See also:drill frame
A length of extra heavy wall drill rod or pipe connected to a drill string
directly above the core barrel or bit, the weight of which is used to
impose the major part of the load required to make the bit cut properly. A
drill collar is usually of nearly the same outside diameter as the bit or
core barrel on which it is used. Not to be confused with guide rod.
Long
A length of steel pipe equipped with a flat cap at one end and a jackscrew
on the opposite end by means of which the pipe can be wedged securely in a
vertical or horizontal position across an underground opening to serve as
a base on which to mount a small diamond or rock drill. Syn:drifter bar;
drill bar; drill stem. See also:bar
A solid, cylindrical sample of rock produced by an annular drill bit,
generally rotatively driven but sometimes cut by percussive methods.
Syn:core
The metal channel on which a heavy drill is fed forward as drilling
proceeds. BS, 12
See:well cuttings; cuttings; sludge.
Industrial diamond used in diamond-drill bits and reaming shells for
coring, cutting, or reaming rock. Drill diamonds usually contain obvious
imperfections and inclusions, although the finer grades approach
toolstones in quality. Also called drill bort; drilling bort; drilling
diamond; drilling. CF:toolstone
a. A person who has acquired enough knowledge and skill to operate and
assume the responsibility of operating a drill machine. Also called drill
runner; runner; tool pusher. Syn:drillman
Long
b. The person in charge of the rig and crew during one tour and who
handles the drilling controls. Brantly, 2
c. A drilling machine. Standard, 2
d. Can. Property being diamond drilled as compared to one undergoing
underground development. Hoffman
e. N. of Eng. Uses an electric or pneumatic twist drill to make shotholes
in the coal. Shotholes in the gateway caunches are usually put on by the
stoneman. Trist
A description of the borehole based on the daily logs from the driller.
Tool for retrieving broken piece of drill from borehole. Pryor, 3
The mechanism for advancing the drill bit during boring. Nelson
Devices, parts, and pieces of equipment used downhole in drilling a
borehole. Also called downhole equipment. Long