ANSI/AGMA 1102-C19 pdf free.American National Standard Tolerance Specification for Gear Hobs.
ANSI/AGMA 1102 applies to single and multiple-thread hobs for spur and helical gears.
1.2 Exceptions
This standard is not intended to completely define the hob tooth profile as it relates to the exact gear profile. It is advisable to check gear tooth profile specifications with the hob manufacturer involved.
Examples include cutting depth and hob tooth profile modification as they affect gear tooth tip relief for fine-pitch and coarse-pitch hobs.
Where conditions require use of hobs of special design or specifications, such hobs shall be considered beyond the scope of this standard.
2 Normative references
The following standards contain provisions which, through reference In this text, constitute provisions of this American National Standard. At the time of publication, the editions indicated were valid. All
standards are subject to revision, and parties to agreements based on this American National Standard are encouraged to investigate the possibility of applying the most recent editions of the standards
indicated below.
ANSI/AGMA 1012-G05, Gear Nomenclature, Definitions of Terms with Symbols
AGMA 915-3-A99, Inspection Practices — Gear Blanks, Shaft Center Distance and Parallelism
3 Terminology and definitions
The terms and definitions used in this standard are, wherever possible, consistent with ANSIIAGMA
1012-G05 and other approved AGMA documents. However, some symbols and definitions used in this standard may differ from other AGMA Standards. Users should assure themselves that they fully
understand the terms, definitions, and symbols as contained in this standard.
Nomenclature used in this standard and the hob elements referred to are illustrated in Figure 1 through Figure 10. Nomenclature of hob elements and other terms relating to hobbing are presented as follows:
active hob length: axial length of the toothed poction of the hob, See Figure 2.
allowable deviation: maximum deviation a hob can have without exceeding the tolerance.
auxiliary leads: feature employed in some hobs, especially worm gear hobs. wherein both sides of the hob thread have leads different from the nominal hob lead: one side longer, the other side shorter. This results in the tooth thickness being successively less toward the roughing end of the hob,
axial plane: plane containing the axis of rotation.ANSI/AGMA 1102 pdf download.