Related Resources: belt design

Service Factors Synchronous Timing Belts

Belt Drive Design and Engineering
Mechanical Gear Design and Engineering

Service Factors for Synchronous Timing Belts per. ANSI RMA IP-24, ISO 5299 and IS 9804.

Service factor is a multiplier or measure of intermitant overload capacity applied to motor, belt, or other machinery.

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Service Factors for Synchronous Timing Belts

Types of
Driving Units
AC Motors: Normal Torque, Squirrel Cage,
Synchronous and Split Phase.
DC Motors: Shunt Wound. Engines:
Multiple Cylinder Internal Combustion.
Types of Driven Machines
Intermittent Service
(3-5 hours daily or seasonal)
Normal Service
(8-10 hours daily)
Continuous Service
(1624 hours daily)
Display, Dispensing, Projection, Medical equipment; Instrumentation;
Measuring devices
1.0
1.2
1.4
Appliances, sweepers, sewing machines;
Office equipment; Wood lathes, band saws
1.2
1.4
1.6
Conveyors: belt, light package,
oven, screens, drums, conical
1.3
1.5
1.7
Agitators for liquids; Dough mixers; Drill presses,
lathes; Screw machines, jointers; Circular saws, planes;
Laundry, Paper, Printing machinery
1.4
1.6
1.8
Agitators for semiliquids; Brick machinery (except pug mills);
Conveyor belt: ore, coal, sand; Line shafts; Machine tools: grinder,
shaper, boring mill, milling machines; Pumps: centrifugal, gear, rotary
1.5
1.7
1.9
Conveyor: apron, pan, bucket, elevator; Extractors, washers;
Fans, blowers; centrifugal, induced draft exhausters;
Generators & exciters; Hoists, elevators; Rubber calenders,
mills, extruders; Saw mill, Textile machinery inc. looms,
spinning frames, twisters
1.6
1.8
2.0
Centrifuges; Conveyors: flight, screw; Hammer mills;
Paper pulpers
1.7
1.9
2.1
Brick & clay pug mills; Fans, blowers, propeller mine fans,
positive blowers
1.8
2.0
2.2
Driving Units AC Motors: High Torque, High Slip, Repulsion-Induction,
Single Phase Series Wound and Slip Ring.
DC Motors: Series Wound and Compound Wound.
Engines: Single Cylinder Internal Combustion. Line Shafts. Clutches.
Types of Driven Machines
Intermittent Service
(3-5 hours daily or seasonal)
Normal Service
(8-10 hours daily)
Continuous Service
(1624 hours daily)
Display, Dispensing, Projection, Medical equipment;
Instrumentation; Measuring devices
1.2
1.4
1.6
Appliances, sweepers, sewing machines; Office equipment;
Wood lathes, band saws
1.4
1.6
1.8
Conveyors: belt, light package, oven, screens, drums, conical
1.5
1.7
1.9
Agitators for liquids; Dough mixers; Drill presses, lathes;
Screw machines, jointers; Circular saws, planes; Laundry,
Paper, Printing machinery
1.6
1.8
2.0
Agitators for semiliquids; Brick machinery (except pug mills);
Conveyor belt: ore, coal, sand; Line shafts;
Machine tools: grinder, shaper, boring mill, milling machines;
Pumps: centrifugal, gear, rotary
1.7
1.9
2.1
Conveyor: apron, pan, bucket, elevator; Extractors, washers;
Fans, blowers; centrifugal, induced draft exhausters;
Generators & exciters; Hoists, elevators; Rubber calenders,
mills, extruders; Saw mill, Textile machinery inc. looms,
spinning frames, twisters
1.8
2.0
2.2
Centrifuges; Conveyors: flight, screw; Hammer mills; Paper pulpers
1.9
2.1
2.3
Brick & clay pug mills; Fans, blowers, propeller mine fans, positive blowers
2.0
2.2
2.4

 

References:

ANSI / RMA IP-24
ISO 5299
IS 9804
Machinerys Handbook, 27th Edition