Program AGMA Gear Classification and Inspection Handbook Model

Transcription

1 Program 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

2 UTS Integrated Gear Software Fig. 1 Report 1 AGMA Quality 9 Message-Quality Number Tooth Thickness Tolerance Code Message-Tooth Thickness Tol Code AGMA Quality Number B Q9B Number of teeth 23 Normal pitch Helix angle Face width Transverse pitch /in ` deg in /in ` 2

3 AGMA Gear Classification and Inspection Handbook Reference pitch diameter Normal module Transverse module Radial Runout (TIR) in mm ` mm ` in Runout Quality Q# m1 Pitch Variation +/ in Pitch Quality Q# m2 Profile Variation in Profile Quality Q# 9 m3 Tooth Alignment in Alignment Quality Q# m4 Tooth to Tooth Composite in Tooth Composite Quality Q# m5 Total Composite in Total Composite Quality Q# m6 Tooth Thickness Tolerance 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

4 UTS Integrated Gear Software Figure 1M and Report 1M show the same data after changing to metric units. Fig. 1M Report 1M Unit System: Metric AGMA Quality 9 Message-Quality Number Tooth Thickness Tolerance Code B Message-Tooth Thickness Tol Code AGMA Quality Number Q9B Number of teeth 23 Normal pitch /in ` Helix angle deg Face width mm 4

5 AGMA Gear Classification and Inspection Handbook Unit System: Metric Transverse pitch /in ` Reference pitch diameter mm Normal module mm ` Transverse module mm ` Radial Runout (TIR) mm Runout Quality Q# m1 Pitch Variation +/ mm Pitch Quality Q# m2 Profile Variation mm Profile Quality Q# m3 Tooth Alignment mm Alignment Quality Q# m4 Tooth to Tooth Composite mm Tooth Composite Quality Q# m5 Total Composite mm Total Composite Quality Q# m6 Tooth Thickness Tolerance 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

6 UTS Integrated Gear Software Fig. 2 Report 2 AGMA Quality Message-Quality Number Tooth Thickness Tolerance Code Message-Tooth Thickness Tol Code AGMA Quality Number NA NA NA Number of teeth 23 Normal pitch Helix angle Face width /in ` deg in 6

7 AGMA Gear Classification and Inspection Handbook Transverse pitch /in ` Reference pitch diameter in Normal module mm ` Transverse module mm ` Radial Runout (TIR) in Runout Quality Q# m1 Pitch Variation +/ in Pitch Quality Q# m2 Profile Variation in Profile Quality Q# 8 m3 Tooth Alignment in Alignment Quality Q# m4 Tooth to Tooth Composite in Tooth Composite Quality Q# m5 Total Composite in Total Composite Quality Q# m6 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