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AGMA 2009-B01 Document Information:
Title
Bevel Gear Classification, Tolerances, and Measuring Methods
American Gear Manufacturers Association
Publication Date:
Jan 1, 2001
Scope:
This standard establishes a classification system which may be used to
communicate geometrical
accuracy specifications of unassembled bevel gearing. It provides a
designation system for accuracy
of bevel gears and gear pairs. It also provides information on
measuring methods and practices.
This standard provides the gear manufacturer and the gear buyer with a
mutually advantageous
reference for uniform tolerances. Eight accuracy grades are defined in
this standard, numbered B3
through B10, in order of decreasing precision.
Equations for tolerances and their ranges of validity are provided in
7.2 for the defined accuracy
of gearing. In general, these tolerances cover the following ranges:
where
dT is tolerance diameter (see 3.2);
mmn is mean normal module;
z is number of teeth.
See clause 4 for required and optional measuring methods.
Tolerance tables
Tolerance tables are provided in annex D for those who prefer to use
tables rather than
computations for the values of the tolerances that define the accuracy
of gearing. These tables are
calculated from the equations in 7.2.
Measuring methods and practices
Measuring methods and practices are included to promote uniform
measurement procedures (see clause
5). These methods permit the user to conduct measuring procedures
which are accurate and repeatable
to a degree compatible with the specified accuracy. Experienced
personnel, with calibrated
instruments in suitable surroundings, are required.
Exceptions
This standard does not apply to enclosed gear unit assemblies,
including speed reducers or
increasers, gear motors, shaft mounted reducers, high speed units, or
other enclosed gear units
which are manufactured for a given power, speed, ratio or application.
Gear design is beyond the scope of this standard. The use of the
accuracy grades for the
determination of gear performance requires extensive experience with
specific applications.
Therefore, the users of this standard are cautioned against the direct
application of tolerance
values to a projected performance of unassembled (loose) gears when
they are assembled. Refer to
the latest AGMA Publications Index for applicable standards.
NOTE: Tolerance values for gears outside the limits stated in this
standard should be established
by determining the specific application requirements. This may require
setting a tolerance smaller
than calculated by the formulas in this standard.
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