HOW TO FIGURE HORSEPOWER and TORQUE
The charts on this page illustrate formulas you can use to determine horsepower and torque. Once you work with them a while, they will be much easier to use.
SERVICE CLASS
Service Factors are numbers which modify the loads and must be considered when selecting a speed reducer. They vary with the type of service in which the reducer is to be used, the kind of prime mover involved and the duty cycle. The service factor can be a multiplier applied to the known load, which redefines the load in accordance with the conditions at which the drive will be used, or it can be a divisor applied to catalog reducer ratings, thus redefining the rating in accordance with drive conditions.
When selecting gears, the service class is dependent on operating conditions – also referred to as the duty cycle. You can determine your gear needs using the following procedure
1.Determine the service factor by using Table 1.
2.Multiply the horsepower required for the application by the service factor.
3.Select the spur gear pinion with Gear catalog rating equal to or greater than the horsepower determined in step 2.
4.Select spur gear with Gear catalog rating equal to or greater than the horsepower determined in step 2.
Example:
An application having a service factor of 1.5 and a required horsepower of 6.0 would require a pinion with a rating equal to or greater than 9.0(1.5 x 6.0) and a gear with a rating equal to or greater than 9.0 (1.5 x 6.0).
