A.R.& E.

 

First Quality ~ First Time
Apparatus Repair & Engineering, Inc.
Hagerstown, MD  21740

800-592-3100

 
 

Home
Read Me First

Personnel
Employment
Manufacturers
Products
Formulae
Definitions
 

 


Terms & Definitions

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.

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.

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]

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.

Frequency

The number of cycles in a specific time period. Alternating current electrical power is expressed in "cycles per second", now termed Hertz.

HVAC

Heating and Ventilating Controls

IEC

International Electrotechnical Commission

IEEE

Referred to as "I-Triple E". Institute of Electrical and Electronics Engineers.

NEC

National Electrical Code

NEMA

National Electrical Manufacturers Association

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.

Input Shaft

The shaft that input power is connected to on a particular device such as a speed reducer, conveyor, or fan or blower.

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.

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.

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. 

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.
 

Hit Counter
This website is
designed and maintained by
A. R.& E. Personnel

Copyright 2014 Apparatus Repair & Engineering, Inc. All rights reserved.
Revised: June 15, 2014.