AGMA 6021 : G

1 Scope
1.1 Limitations
1.2 Exceptions
1.3 References
2 Symbols and terms
3 Application and design considerations
3.1 Momentary peak load
3.2 Rating factors
3.3 Metallurgy
3.4 System analysis
4 Unit rating
4.1 External loading
4.2 Efficiency
5 Rating criteria
5.1 Gear tooth capacity (general)
5.2 Surface hardened gearing
5.3 Determining pitting resistance rating
5.4 Determining bending strength rating
6 Thermal power rating
6.1 Intermittent service
6.2 Adverse conditions
6.3 Favorable conditions
6.4 Auxiliary cooling
7 Components
7.1 Housing
7.2 Shafting
7.3 Keys
7.4 Roller and ball bearings
7.5 Threaded fasteners
7.6 Miscellaneous components
8 Application classification and overhung load
8.1 Selection of application classification numbers
8.2 Listing of application classification and class
      numbers
8.3 Determining application classification number
8.4 Overhung load calculation
9 Lubrication and lubricants
9.1 Lubrication
9.2 Lubricant viscosity
9.3 Lubricant recommendation
9.4 Cold temperature conditions
9.5 Lubricant types
9.6 Lubricant maintenance
10 Sound
11 Screw conveyor drive dimensions
11.1 Drive shaft dimensions
11.2 Mounting dimensions
12 Sizes, designations and ratios
12.1 Standard sizes
12.2 Standard designations
12.3 Ratios
13 Marking and identification
14 Storage
14.1 Normal storage
14.2 Adverse conditions or long term storage
15 Installation
15.1 Supporting shaft
15.2 Mounting
15.3 Torque reaction member
15.4 Shaft connections
15.5 Screw conveyors
Bibliography
Appendices
A Application classification and class numbers
B Geometry factor, I, for pitting resistance for
      spur, helical and herringbone gears
C Geometry factor, J, for bending strength for spur,
      helical and herringbone gears
D Recommended bore sizes for shaft mounted and screw
      conveyor drives
E Shaft mounted and screw conveyor drive ratings
F Miner's rule
G Illustrative examples
Tables
2.1 Symbols
5.1 Approximate values of geometry factor, I, for
      20 degrees normal pressure angle helical gears
5.2 Approximate values of geometry factor, I, for
      25 degrees normal pressure angle helical gears
5.3 Approximate values of geometry factor, I, for spur
      gears
5.4 Allowable contact stress number, sac
5.5 Elastic coefficient, Cp
5.6 Allowable bending stress number, sat
5.7 Yield strength factor, Ky
7.1 Allowable shaft stress multipliers
7.2 Typical allowable stresses for keys and keyways
7.3 Allowable tensile stress for typical inch threaded
      fasteners
7.4 Allowable tensile stress for typical metric
      threaded fasteners
8.1 Service factor, KSF
8.2 Overhung load factor, Koh
9.1 Viscosity ranges for AGMA lubricants
9.2 R&O and EP lubrication recommendations
9.3 Synthetic hydrocarbon lubrication recommendations
11.1 Screw conveyor drive shaft dimensions
11.2 Screw conveyor drive mounting dimensions
12.1 Standard sizes
12.2 Ratios
15.1 Shaft diameter tolerances

Presents methods of rating the pitting resistance and bending strength of spur, helical and herringbone gears used for shaft mounted reducers and screw conveyor drives. Also included is information on unit rating, lubrication, components, thermal ratings, storage and installation.