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AGMA 1103

Tooth Proportions for Fine-Pitch Spur and Helical Gearing (Metric Edition)

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Organization: AGMA
Publication Date: 1 January 2007
Status: active
Page Count: 32
scope:

This standard is applicable to external spur and helical gears with 1.25 through 0.2 module and a profile angle of 20 degrees.

It only applies to standard gears with 24 teeth or more; enlarged pinions with 9 through 23 teeth; and reduced gears for meshing with enlarged pinions at standard center distances.

Much of this same information is applicable to internal gears.

Tooth proportions

The tooth proportions shown hereinmay be used for many gear designs of finer than 0.2 module; however, such designs should be checked for suitability, particularly in the areas of contact ratio, undercutting, and clearance.

This standard is similar to ISO 53, Cylindrical gears for general and heavy engineering - Standard basic rack tooth profile.

The main difference between the proportions of fine-pitch gears and those of coarse-pitch is in the clearance. In fine-pitch gearing, wear on the points of the cutting tools is proportionally greater than in coarse-pitch tools. The fillet radius produced by such tooling will therefore be proportionally greater. The increased clearance in gearing of 1.25 module and finer provides both for the relatively larger fillet and also for foreign material that tends to accumulate at the bottoms of the teeth.

Number of teeth

Gear designs with low numbers of teeth should be checked for suitability, particularly in the areas of contact ratio, undercutting, and clearance, as well as for strength and durability for load and life considerations.

Document History

AGMA 1103
January 1, 2007
Tooth Proportions for Fine-Pitch Spur and Helical Gearing (Metric Edition)
This standard is applicable to external spur and helical gears with 1.25 through 0.2 module and a profile angle of 20 degrees. It only applies to standard gears with 24 teeth or more; enlarged...
January 1, 2007
Tooth Proportions for Fine- Pitch Spur and Helical Gearing (Metric Edition)
This standard is applicable to external spur and helical gears with 1.25 through 0.2 module and a profile angle of 20 degrees. It only applies to standard gears with 24 teeth or more; enlarged...
January 1, 2007
Tooth Proportions for Fine- Pitch Spur and Helical Gearing (Metric Edition)
Tooth proportions for fine-pitch gearing are similar to those of coarse pitch gearing except in the matter of clearance. This standard is applicable to external spur and helical gears with diametral...

References

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