ANSI/AGMA 2005-D03 pdf free.American National Standard – Design Manual for Bevel  Gears.
The symbols, terms, and definitions used in this standard are, wherever possible. consistent with other approved AGMA documents. It is known, because of certain limitations, that some symbols, their titles, and their definitions, as used in this document, are different than in similar literature pertaining to spur and helical gearing.
Bevel gear nomenclature used throughout this standard is illustrated in figure 1, the axial section of a bevel gear, and in figure 2, the mean transverse section. Hypoid nomenclature is illustrated in figure
3.1 Symbols
Table 1 is a list of the symbols used in this standard, along with the associated terms. The Where first used column gives the clause or equation number where the particular symbol is first used.
3.2 DefinitIon of terms
addendum of gear, mean, aG: The height by which the gear tooth projects above the pitch cone at the mean cone distance.
addendum of pinion, mean, op: The height by which the pinion tooth projects above the pitch cone at the mean cone distance.
addendum of gear, mean normal chordal, ac,J:
The height from the top of the gear tooth to the chord subtending the circular thickness arc at the mean cone distance in a plane normal to the tooth trace.
addendum of pinion, mean normal chordal, ap:
The height from the top of the pinion tooth to the chord subtending the circular thickness arc at the mean cone distance in a plane normal to the tooth trace.
back angle distance, LBG, L8p: The distance from the intersection of the gear axis and the mounting surface to a back cone element, for gear and pinion respectively.
backlash allowance, outer normal, 8: The amount by which the tooth thicknesses are reduced to provide the necessary backlash in assembly. It is specified at the outer cone distance.
commercial quality: Those gears that are cut under process control to an accuracy level of AGMA Q7 to 09.
control gear: The adopted term for bevel gearing in place of the term, master gear, which implies a gear with all tooth specifications held to close tolerances. However, the term master gear is frequently used.
crown to back, LXG, Lxp: The perpendicular distance from the mounting surface to the intersection of a face cone element with a back cone element, for gear and pinion respectively,
cutter radius, r: The nominal radius of the face type cutter or cup-shaped grinding wheel that is used to cut or grind the spiral bevel teeth.
dedendum angles, duplex sum of, ô1): The sum of dedendum angles for duplex taper.ANSI/AGMA 2005 pdf download.