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AGMA 2011-A98 Document Information:
Title
Cylindrical Wormgearing Tolerance and Inspection Methods
American Gear Manufacturers Association
Publication Date:
Jun 1, 1998
Scope:
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 provides
the 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.
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.
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
accurate and repeatable to a degree compatible with the specified
tolerance grade.
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 beyond the scope of
this standard. Gear design and backlash are also beyond the scope of
this standard. Refer to the 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 larger than 100 inches. This standard does not apply to
geometry finer than 0.063 axial pitch. This standard does not apply to
spiral gears or any type other than cylindrical single enveloping
wormgearing.
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
for loss 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.
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