AGMA 6022 : C

Foreword
1 Scope
   1.1 Uses of wormgearing
   1.2 Intended use
2 Symbols, terms and definitions
3 General design considerations
   3.1 Characteristics of wormgearing
   3.2 Loading
   3.3 Ratios
   3.4 Conjugate action
   3.5 Thread profile of worm
   3.6 Accuracy requirements
4 Design procedure
   4.1 Number of teeth in the wormgear
   4.2 Number of threads in the worm
   4.3 Worm pitch diameter
   4.4 Wormgear pitch diameter
   4.5 Worm axial pitch
   4.6 Worm lead
   4.7 Lead angle of the worm
   4.8 Pressure angle
   4.9 Customary thread and tooth proportions
5 Modified tooth proportions
   5.1 High contact ratio designs
   5.2 Stub tooth designs
   5.3 Recess and approach action
   5.4 Design for additional or full recess action
   5.5 Alternative design for additional or full recess action
        gearing
6 Contact patterns
   6.1 Initial contact for power drive wormgearing
   6.2 Unacceptable initial contact
   6.3 Mounting and assembly problems and their effects on
        initial contact patterns
   6.4 Other causes of variations in initial contact patterns
   6.5 Wormgear contact under load
   6.6 Special initial wormgear contact
7 Run-in procedures
   7.1 Definition of run-in
   7.2 Results of run-in
   7.3 Initial running at full load
   7.4 Initial friction at the mesh
   7.5 Recommended run-in period
   7.6 Wormgear pitting
8 Rating and efficiency
9 Wormgear blank design
   9.1 Typical wormgear blank configuration
   9.2 Wormgear web configuration
   9.3 Wormgear hub design
10 Worm manufacturing practices
   10.1 Worm thread milling
   10.2 Worm thread milling with multiple milling cutters
   10.3 Worm thread hobbing
   10.4 Worm thread generating with a shaper cutter
   10.5 Worm thread rolling
   10.6 Worm thread grinding
11 Wormgear manufacturing practices
   11.1 Wormgear hobs
   11.2 Wormgear hob design
   11.3 Wormgear flyhobbing
12 Materials and heat treatment
   12.1 Worm materials
   12.2 Wormgear materials
13 Lubrication
   13.1 Regimes of lubrication
   13.2 Mineral oils
   13.3 Synthetic oils
   13.4 Splash lubrication
   13.5 Forced feed lubrication
14 Analysis of gearing forces, worm bending stress, and
   deflection
   14.1 Tangential, separating, and thrust forces
   14.2 Worm bearing reactions
   14.3 Worm bending stress
   14.4 Allowable worm bending stress
   14.5 Worm deflection
15 Assembly procedures
   15.1 The housing
   15.2 Position tolerance
   15.3 Contact pattern check
   15.4 Backlash check
   15.5 End play check
Annexes
A Formulas for worm thread profiles
B Sources of formulas used for determining worm thread
  profiles
C Sources of information concerning hob design
D Worm thread profiles - axial sections

Covers the design of fine and coarse pitch cylindrical wormgearing operating at right angles and primarily made as gear sets to be incorporated into other machines and mechanisms.