This standard provides specifications for nomenclature,
dimensions, tolerances, and inspection for gear
hobs for modules 0.63 to 40 mm. It establishes a
basis for understanding the use and manufacture of
these tools.
1.1 Application
This standard 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.