Mechanical Definitions
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Drill vice : A vice used on the table of a drill press
for holding work to be drilled. |
Drive : The means by which the machine is given motion
or power, or by which power is transferred from one part of
a machine to another. |
Drive pulley : The pulley that drives a conveyor belt.
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Drive shaft : A shaft which transmits power from a motor or engine to the rest of a machine.
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Drop bar : A bar that guids sheets of paper into a printing or folding machine.
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Drum brake : A brake in which two curved shoes fitted with heat and wear-resistant linings are forced against the surface of a rotating drum.
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Drum cam : A device consisting of a drum with a contoured surface which communicates motion to a cam follower as the drum rotates around an axis.
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Drum gate : A movable crest gate in the form of an arc hinged at the apex and opperated by reservoir pressure to open and close a spillway.
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Dry pipe : A perforated metal pipe above the normal water level in the stem space of a boiler which which prevents moisture or extraneous matter from entering steam outlet lines.
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Dry sieving : Dry sieving is a particle size distribution
analysis of powdered solids. The sample is placed on the top
sieve screen of a nest, with mesh openings decreasing in size
from the top to the bottom of the nest. |
Drzwiecki theory : In theoretical investigations of windmill performance a theory concerning the air forces produced on an element of the blade.
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Duckbill : A shanking type of combination loader and conveyor whose loading end is generally shaped like a duck's bill.
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