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Gearbox> Worm Reducer and Worm Motor

5. SERVICE FACTOR

1.Features of the EG Worm Reducer 2.Designation and Location of Input Shaft
	2-1)Designation 2-2)Transmission Ratio 2-3)Symbols of Designatio n
3. Selection
	3-1) How to Select Proper Worm gear moto r 3-2) Other Consideration for Selection 3-3) Standard Specification of Motor 3-4) Data table of Reducer Selection
4. Convenient Technical Formulas
5. Service Factor
6.Over Hung Load
7.Backlash and Installation
8.Lubrication and Maintenance
9.Nominal Transmission Ratio,Power and Torque
10.Designs,Dimensions and Mounting Position
11.Accessories for The Mounting
	11-1) Foot Plate and Vertical Flange 11-2) Torque Arm
12. Table of Bearing and Oil Seal
13. Designs and Dimensions of Motor
14.Example of Mounting
15.Drawing Room

The service factor Sf must be determined by considering of integral operation conditions such as the operating time per a day, the number of starts and stops per an hour,the load classification, ambient temperature and other considerations.
Besides personnel safety, roll of the reducer to the production line and maintenance conditions are as important as described above. The strength calculations are based on continuous 10 hour operation per a day on uniform load.
In order to ensure personnel safety and long trouble free operation , select a service factor equal to or greater than that determined from the table would be preferable The output torque specified in the catalogue is based on Sf=1. The total combined service factor is calculated as follows

Sf _total=Sf * Sf₁ *Sf₂

where

Sf=일general service factor
Sf₁=service factor for increased ambient temperature
Sf₂=service factor for frequency of starting

Sevice Factor(Sf)

load classification	running time per an hour/day
load classification	3	8	12	24
uniform load	0.80	1.00	1.15	1.25
moderate shock load	1.00	1.25	1.35	1.50
heavy shock load	1.50	1.75	1.75	1.75

Service Factor to the Ambient Temperature Increasing(Sf₁)

load classification	ambient temperature℃)
load classification	20	25	30	35	40
uniform load	1.00	1.10	1.22	1.35	1.52
moderate shock load	1.00	1.08	1.80	1.28	1.40
heavy shock load	1.00	1.05	1.15	1.20	1.29

Servie Factor to the Frequency of Starting(Sf₂)

load classification	frequency of starting /hour
load classification	4	8	16	32	63	125	250	500
uniform load	1.00	1.06	1.12	1.18	1.25	1.32	1.40	1.50
moderate shock load	1.00	1.00	1.06	1.12	1.18	1.25	1.32	1.40
heavy shock load	1.00	1.00	1	1.06	1.12	1.18	1.25	1.32

Load Classification

load classification	driven machines
uniform load	Automatic machines Fan Elevator	Extruder Air blower Light duty water cleaner	Uniform load conveyer Centrifugal pump
moderate shock load	Bucket Elevator Food machine Dewatering screw pump	Compressor Crane/hoist Sugar machine	Belt conveyer Textile machine
heavy shock load	Ball mill Metal processing machine Rubber calendar	Heavy duty extruder Crusher Hammer Mill	Heavy duty ceramic machine Brick press