Select service factor (Sf)

Service factor - a coefficient that determines the quality of work of a group of equipment (motor + gearbox) in real conditions.

If a gearbox without a motor is selected, the service factor is "1" . A correction factor should be applied to normal technical parameters of the selected gearbox, taking into account the actual conditions of its operation.

It is recommended to select gearboxes with a service factor equal to or greater than that indicated in the summary table.

The service factor ( Sf ) depends on the operating conditions of the worm gear.

Parameters that must be taken into account for an accurate calculation of the service factor:

• work equipment load type: A - B - C
• hours/day
• start frequency: starts/hour

fa = Je/Jm

Je (kgm2) - moment of reduced inertia of the external load on the drive shaft

Jm (kgm2) - motor moment of inertia

For fa > 10, please contact our Technical Service.

• A -

  Augers for conveying light materials, fans, assembly lines, belt conveyors for light materials, small mixers, lifts, cleaners, aggregates, control systems.

• In -

  Winding mechanisms, woodworking feeders machine tools, freight elevators, balancers, threading machines, medium mixers, belt conveyors for heavy materials, winches, sliding doors, fertilizer scrapers, packaging machines, concrete mixers, crane mechanisms, cutters, bending machines, gear pumps.

• With -

  Heavy material mixers, shears, presses, centrifuges, calipers, winches and hoists for heavy materials, turning grinding machines, stone crushers, bucket elevators, drilling machines, hammer mills, cam presses, bending machines, rotary tables, cleaning drums, vibrators, grinders.