This standard establishes a classification system
which may be used to communicate geometrical
accuracy specifications of unassembled cylindrical
wormgearing with axes at right angles. It also
provides information on measuring methods and
practices. This standard providesth e gear manufacturer
and the gear purchaser with a mutually
advantageous reference for uniform tolerances and
inspection procedures. Tolerance grades 3 through
12 are defined in this standard and are based on the
relative effect of geometrical errors on conjugate
action for wormgear sets acting as speed reducers.
1.1 Tolerance equations and tables
Tolerance equations are provided in clause 5 for
calculating the maximum values allowed by the
specific tolerance grade. Tables are provided in
annex A for reference.
1.2 Measuring methods and practices
Measuring methods and practices are included in
order to promote uniform inspection procedures
(see clause 4). These methods permit the manufacturer
and purchaser to conduct measuring procedures
which are accuratea nd repeatable to a degree
compatible with the specified tolerance grade.
1.3 Exceptions
This standard applies to individual worm and gear
components. It does not establish a tolerance grade
for enclosed drive assemblies. Establishing ratings
based on tolerance grade is beyontdh e scope of this
standard. Gear design and backlash are also
beyond the scope of this standard. Refer tot he latest AGMA Publications Catalog for applicable standards.
This standard does not apply to worms with
mean diameters larger than 16 inches, nor does it
apply to wormgears with mean diameters largtehra n
100 inches. This standard does not apply to
geometry finer than 0.063 axial pitch. This standard
does not applyt o spiral gears or anyty pe other than
cylindrical single enveloping wormgearing.
1.4 Limitations
The American Gear Manufacturers Association
makes no representation, warranty or guarantee in
connection with the publication of any AGMA
Standard and hereby expressly disclaims any liability
or responsibility folro ss or damage resulting from
their use. Similarly, violation of any federal, state or
municipal regulation with which an AGMA Standard
may conflict, or for the infringement of any patent
resulting from the use of an AGMA Standard is the
responsibility of the user.
AGMA 2011-A98-1998 history
2014AGMA 2011-B14-2014 Cylindrical Wormgearing Tolerance and Inspection Methods
1998AGMA 2011-A98-1998 Cylindrical Wormgearing Tolerance and Inspection Methods Replacement of AGMA 390.03a
AGMA 2011-A98-1998 Cylindrical Wormgearing Tolerance and Inspection Methods Replacement of AGMA 390.03a was changed to AGMA 2011-B14-2014 Cylindrical Wormgearing Tolerance and Inspection Methods.