The opening or surrounding blocks in a furnace wall to receive the channel
leading to the feeder. ASTM
a. A short auxiliary conveyor designed to receive coal from the face
conveyor and load it onto the gate conveyor. Also called stage loader.
See also:feeder; gate-end feeder; gate-end loader. Nelson
b. Any conveyor that transports material to another conveyor.
NEMA, 2
In a duckbill, the trough that is attached to the conveyor pan line and
serves as a base on which the feeder trough rides. Jones, 1
A small ore-bearing vein joining a larger one. See also:feeder
The gearing or assemblage of three to four pairs of matched gears in a
gear-feed swivel head of a diamond drill by means of which the drill
string coupled to the feed screw is made to advance and penetrate the
formation. See also:gear
See:swivel head
A door or gate that can be opened or closed to regulate the discharge of
material from a hopper, bin, or chute. Nelson
a. Total weight or pressure, expressed in pounds or tons, applied to
drilling stem to make the drill bit cut and penetrate the formation being
drilled. Long
b. Pressure, expressed in pounds per square inch, required to force grout
into a rock formation. CF:injection pressure
The pump that provides a steam boiler with feedwater. Nelson
Rate at which a drilling bit is advanced into or penetrates the rock
formation being drilled, expressed in inches per minute, inch per bit
revolution, number of bit revolutions per inch of advance, or feet per
hour. Also called cutting rate; forward speed. Syn:penetration rate;
bit feed; cutting speed; drill rate; penetration feed. Long
The number of revolutions a drill stem and bit must turn to advance the
drill bit 1 in (2.54 cm) when the stem is attached to and rotated by a
screw- or gear-feed-type drill swivel head with a particular pair of the
set of gears engaged. (E.g., when a screw-feed swivel head of a diamond
drill equipped with three pairs of gears, having a feed ratio of 100, 200,
and 400, is operated with the 100-pair engaged, the drill stem must
revolve 100 times to advance the bit 1 in, if the 200-pair is engaged, the
drill stem rotates 200 times/in (508 times/cm) advanced, and if the
400-pair is engaged the stem must rotate 400 times to advance the bit 1
in). Long
A short shaft or countershaft in a diamond-drill gear-feed swivel head
rotated by the drill motor through gears or a fractional drive and by
means of which the engaged pair of feed gears is driven.
Syn:feed spindle
Normally used by drillers to denote feed ratios. Long
See:feed shaft
and/or feed screw. Long
The distance a drilling machine moves the steel shank in traveling from
top to bottom of its feeding range. Nichols, 1
Water that is often purified, heated to nearly boiler temperature, and
deaerated before being pumped into a steam boiler by the feed pump.
Nelson
Person (usually an engineer) who looks after the interest of the owner of
mineral rights. Specific duties are to check on the amount of ore mined by
the lessor (operator), see that no undue waste is permitted, and see that
royalties are paid according to contract.
Refuse or dirt from ore or coal. CTD
A jewel diamond having its grain in regular layers. CF:naetig
Brady, 2
a. A monoclinic or triclinic mineral with the general formula XZ4 O
8 where (X= Ba,Ca,K,Na,NH4 ) and (Z= Al,B,Si); a group
containing two high-temperature series, plagioclase and alkali feldspar;
colorless or white and clear to translucent where pure; commonly twinned;
90 degrees or near 90 degrees prismatic cleavage; Mohs hardness, 6.
Constituting 60% of the Earth's crust, feldspar occurs in all rock types
and decomposes to form much of the clay in soil, including kaolinite. Also
spelled felspar, feldspath. CF:sanidine
b. The mineral group albite, andesine, anorthite, anorthoclase, banalsite,
buddingtonite, bytownite, celsian, hyalophane, labradorite, microcline,
oligoclase, orthoclase, paracelsian, plagioclase, reedmergnerite,
sanidine, and slawsonite.