Program 60-100—AGMA Gear Classification and
Inspection Handbook Model
Introduction
This model calculates the dimensional tolerances for unassembled spur, helical,
double helical, and herringbone gears in accordance with ANSI/AGMA Standard
2000-A88, Gear Classification and Inspection Handbook.
For pitches between .5 and 20 (inclusive), the standard supplies tolerances for
runout, pitch, profile, lead, tooth to tooth composite, and total composite depending
`upon the quality class. (Composite tolerance is used when checking with a master
gear.) For pitches above 20 the standard supplies only the tooth to tooth and total
composite tolerances. However, the model furnishes the remaining tolerances for
reference. In this case the tolerances are labeled “NOT STD”. If the tooth thickness
code is entered the model will furnish the tooth thickness tolerance for the gear if the
data is within the scope of the standard for tooth thickness.
To use the model in the conventional manner, enter the Quality number and obtain
the tolerances. (See Figure 1 and Report 1.) If desired, the actual readings from the
gear may be entered and the corresponding Quality number for each element
obtained. The Quality number, in this case, will be broken down to the closest tenth
to indicate how close the gear is to the closest integer quality number. (See Figure 2
and Report 2.)
Examples
Figure 1 and Report 1 show the solved model of a 23 tooth spur gear with a 9 AGMA
quality class and a tooth thickness tolerance to Code B. Since the tooth thickness
code is valid for this gear we obtain the AGMA Quality Number “Q9B”.
1
UTS Integrated Gear Software
Fig. 1
Report 1
Model Title :
Program 60-100
Unit System:
US
Description
Value
AGMA Quality
Unit
9
Message-Quality Number
OK
Tooth Thickness Tolerance Code
B
Message-Tooth Thickness Tol Code
OK
AGMA Quality Number
Q9B
Number of teeth
23
Normal pitch
10.000000 1/in `
Helix angle
0.000000 deg
Face width
1.7500 in
Transverse pitch
10.000 1/in `
2
Comment
60-100–AGMA Gear Classification and Inspection Handbook
Model Title :
Program 60-100
Unit System:
US
Description
Value
Reference pitch diameter
2.3000 in
Normal module
Unit
Comment
2.540000 mm `
Transverse module
2.540 mm `
Radial Runout (TIR)
0.00170 in
Runout Quality Q#
9.000
m1
OK
Pitch Variation +/-
0.00051 in
Pitch Quality Q#
9.0000
m2
OK
Profile Variation
0.00064 in
Profile Quality Q#
9
m3
OK
Tooth Alignment
0.00060 in
Alignment Quality Q#
9.0000
m4
OK
Tooth to Tooth Composite
0.00110 in
Tooth Composite Quality Q#
9.0000
m5
OK
Total Composite
0.00270 in
Total Composite Quality Q#
9.0000
m6
OK
Tooth Thickness Tolerance
0.00209 in
In this example we entered the AGMA quality number and the AGMA tooth
thickness code and obtained the tolerances for the various elements of the gear.
3
UTS Integrated Gear Software
Figure 1M and Report 1M show the same data after changing to metric units.
Fig. 1M
Report 1M
Model Title :
Program 60-100
Unit System:
Metric
Description
Value
AGMA Quality
Unit
9
Message-Quality Number
OK
Tooth Thickness Tolerance Code
B
Message-Tooth Thickness Tol Code
OK
AGMA Quality Number
Q9B
Number of teeth
23
Normal pitch
10.000000 1/in `
Helix angle
0.000000 deg
Face width
44.4500 mm
4
Comment
60-100–AGMA Gear Classification and Inspection Handbook
Model Title :
Program 60-100
Unit System:
Metric
Description
Value
Transverse pitch
10.000 1/in `
Reference pitch diameter
Unit
Comment
58.4200 mm
Normal module
2.540000 mm `
Transverse module
2.540 mm `
Radial Runout (TIR)
0.04318 mm
Runout Quality Q#
9.000
m1
OK
Pitch Variation +/-
0.01295 mm
Pitch Quality Q#
9.0000
m2
OK
Profile Variation
0.01626 mm
Profile Quality Q#
9.0000
m3
OK
Tooth Alignment
0.01524 mm
Alignment Quality Q#
9.0000
m4
OK
Tooth to Tooth Composite
0.02794 mm
Tooth Composite Quality Q#
9.0000
m5
OK
Total Composite
0.06858 mm
Total Composite Quality Q#
9.0000
m6
OK
Tooth Thickness Tolerance
0.05302 mm
Now we will enter the actual measurements for a gear to find the AGMA Quality
Number of the various elements of the gear. Figure 2 is the completed data entry
form and Report 2 the solved model for a 23-tooth helical gear.
5
UTS Integrated Gear Software
Fig. 2
Report 2
Model Title :
Program 60-100
Unit System:
US
Description
Value
Unit
AGMA Quality
Message-Quality Number
NA
Tooth Thickness Tolerance Code
Message-Tooth Thickness Tol Code
NA
AGMA Quality Number
NA
Number of teeth
23
Normal pitch
10.000000 1/in `
Helix angle
15.000000 deg
Face width
1.0000 in
6
Comment
60-100–AGMA Gear Classification and Inspection Handbook
Model Title :
Program 60-100
Unit System:
US
Description
Value
Transverse pitch
Unit
Comment
9.659 1/in `
Reference pitch diameter
2.3811 in
Normal module
2.540000 mm `
Transverse module
2.630 mm `
Radial Runout (TIR)
0.00280 in
Runout Quality Q#
7.500
m1
OK
Pitch Variation +/-
0.00075 in
Pitch Quality Q#
7.9000
m2
OK
Profile Variation
0.00090 in
Profile Quality Q#
8
m3
OK
Tooth Alignment
0.00040 in
Alignment Quality Q#
9.0000
m4
OK
Tooth to Tooth Composite
0.00140 in
Tooth Composite Quality Q#
8.2000
m5
OK
Total Composite
0.00390 in
Total Composite Quality Q#
7.9000
m6
OK
Tooth Thickness Tolerance
NA in
Reference
Data Extracted from ANSI/AGMA 2000-A88, Gear Classification and Inspection
Handbook, with the permission of the publisher, American Gear Manufacturers
Association, 1500 King Street, Suite 201, Alexandria, VA 22314.
7