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CW |
| Clockwise - This
definition seems simple enough, but today's "digital"
clocks don't have "hands that move", so some, of our
younger generation, need to be taught the principle. If
you begin at the TOP of a circle and move DOWNWARD, to the RIGHT,
around the circumference, you will be moving CLOCKWISE. |
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CCW |
| Counter-clockwise
- This definition seems simple enough, but today's
"digital" clocks don't have "hands that move", so
some, in our younger generation, need to be taught the principle. If
you begin at the TOP of a circle and move DOWNWARD, to the LEFT, around
the circumference, you will be moving COUNTER-CLOCKWISE. |
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Synchronous
Speed |
| The speed of the rotating machine element of an AC
motor that matches the speed of the rotating magnetic field created by
the motor's power winding. [Formula] |
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Horsepower |
| The unit of power for motors and other prime movers or
the rate of doing work. One horsepower is equivalent to 33,000
foot-pounds of work produced in one minute. It is also equal to 746
watts of electrical power. |
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Frequency |
| The number of cycles in a specific time period.
Alternating current electrical power is expressed in "cycles per
second", now termed Hertz. |
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HVAC |
| Heating and Ventilating Controls |
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IEC |
| International Electrotechnical Commission |
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IEEE |
| Referred to as "I-Triple E". Institute of
Electrical and Electronics Engineers. |
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NEC |
| National Electrical Code |
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NEMA |
| National Electrical Manufacturers Association |
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Right
Angle Reducer |
| The OUTPUT SHAFT of
the speed reducer is displaced from the INPUT
SHAFT of the reducer by 90 degrees. This is usually due to the
type of gearing used in the inside of the gearbox, such as a Worm
Gear Reducer or a Bevel Gear Reducer. |
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Input
Shaft |
| The shaft that input power is connected to on a
particular device such as a speed reducer, conveyor, or fan or
blower. |
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Output
Shaft |
| The shaft that is used to transmit rotational
power to a driven device to be used for some process or purpose.
This output shaft can be the shaft of an electric motor, a speed
reducer, or some other mechanical device used to transmit power to a
driven piece of equipment. |
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Worm
Gear |
| A "spiral" or "screw shape"
appearing gear machined into the surface of a steel shaft. As the
shaft is turned, a driven mating gear is "pushed" or
"pulled" along the surface of the screw. The
"pitch" of the screw, or how rapidly a particular point on
it's surface will move when rotated, determines how fast a mating
gear will be moved based on a constant rotating speed of the worm
gear. High friction must be compensated for by lubrication. |
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Worm
Wheel |
| The mating or OUTPUT gear in a right angle, worm
gear speed reducer. This gear is usually made of BRASS due to it's malleability.
The brass actually wears out as the reducer is used but with proper
lubrication, this action takes a long time. |
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Center
Distance |
| The center distance is
identified as the distance from the center of the shaft of the worm
gear to the center of the output shaft. This distance is measured in
INCHES and, as a true measurement, will be noted to the third
decimal. An example of one particular center distance is
2.375". This center distance will indicate a reducer size of
237 by most manufacturers. |
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