Mechanical Definitions |
Dragline scraper : A machine with a flat, plowlike blade
or partially open bucket pulled on rope for withdrawing piled
material, such as stone or coal, from a stockyard to the loading
platform. The empty bucket is subsequently returned to the pile
of material by means of a return rope. |
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Draught : The draught is called Natural Draught when
it is produced by a chimney and the draught is called Artificial
Draught when it is produced by steam jets or mechanical fans.
- Induced Artificial Draught : In this draught fan is mounted
at the exit from chimney, sucking gases through boiler furnace.
- Forced Artificial Draught : In this draught air is forced
by a fan to pass through boiler furnace and ultimately to
atmosphere.
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Drawbar pull : The force with which a locomotive or tractor
pulls vehicles on a drawbar behind it. |
Dredging : Dredging is a process of removing solid matter
from the bottom of a water area. |
Drill carriage : A platform or frame on which several
rock drills are mounted and which moves along a track, for heavy
drilling in large tunnels. It can also be termed as jumbo. |
Drilling machine : A device, usually motor driven, fitted
with an end cutting tool that rotated with sufficient power
either to create a hole or to enlarge an existing hole in a
solid material. It can also be termed as driller. |
Drill log : A Drill log is a record of the events and
features of the formations penetrated during boring. It can
also be termed as boring log. A record of all occurrences of
all occurrences during drilling that might help in a complete
logging of the hole or in determining the cost of the drilling.
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Drill sleeve : A tapered, hollow steel shaft designed
to fit the tapered shank of a cutting tool to adapt it to the
drill press spindle. |
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