SCOPE
This information sheet contains tolerance tables dealing with the tangential measurements of cylindrical involute gear tooth flanks.  While the tables may be used to estimate the tolerances, the actual tolerance should be calculated and rounded according to the formulas in ANSI/AGMA 2015-1-A01.  It supplements the standard ANSI/AGMA 2015-1-A01, Accuracy Classification System - Tangential Measurements for Cylindrical Gears.

FOREWORD
This Information Sheet (supplement) is provided for informational purposes only, and should not be construed to be part of American Gear Manufacturers Association Standard ANSI/AGMA 2015-1-A01.

This supplement provides tables of tolerances for all the different gear accuracy grades. While the tables may be used to estimate the tolerances, the actual tolerance should be calculated and rounded according to the formulas in ANSI/AGMA 2015-1-A01.

The range of gear sizes covered by the standard is generally shown in the tables.  The tolerances are calculated at convenient combinations of module and tolerance diameter, dT.  The tables are limited to the range of 5 to 1000 teeth, using the simple spur gear relationship that tolerance diameter is approximately equal to the number of teeth times the module. The tolerance diameter of helical gears may be significantly higher.  The helix tables are arbitrarily limited to a minimum facewidth of dT/40 and a maximum face width of 3 dT, values outside of which are generally beyond normal practice.  Some combinations of module and diameter or facewidth that are beyond the range shown in these tables may be valid.  Therefore, limits of application implied by these tables should not be relied upon; the actual limits given in ANSI/AGMA 2015-1-A01 should be used.

The tables with inch units cover a slightly narrower range than those given in the metric tables.  The inch tables are just within the limits given in ANSI/AGMA 2015-1-A01.  The diameter of 98 inches is used because the composite tolerances are limited to a tolerance diameter of 2500 mm (98.425 inches).

It should be noted that ANSI/AGMA 2015-1-A01 uses a fundamentally different evaluation method for tooth-to-tooth single flank composite tolerances than was used in prior standards; therefore these tolerances should not be directly compared to those in prior standards.

The first draft of the Supplemental Tables for AGMA 2015/915-1-A02 was made in January, 2002.  It was approved by the AGMA Technical Division Executive Committee in October, 2002.

Suggestions for improvement of this standard will be welcome.  They should be sent to the American Gear Manufacturers Association, 1001 N. Fairfax Street, Suite 500, Alexandria, Virginia  22314.