ANSI/AGMA 1003-H07 pdf free.American National Standard – Tooth Proportions for Fine – Pitch Spur and Helical Gearing.
The basic rack shown in fIgure 1 is used to Illustrate the tooth proportions covered by this standard. This standard permits freedom of choice in making changes in the gear tooth proportions to meet special design conditions as long as the resulting gears are fully conjugate to the basic rack. Such changes may be indicated when a special contact ratio or modification for tooth strength is desired.
4.1.1 Spur gears
The basic rack shown in figure 1 and the tooth proportions shown in table 2 provide the basic design data for spur gear teeth,
4.1.2 Helical gears
Helical teeth covered by this standard are conjugate in the normal plane to the basic rack shown in figure 1 and table 2.
4.2 Pressure angle and profile angle
4.2.1 Pressure angle
While profile angle is the slope of the cutting tool, a pressure angle may be defined at any point on the flank of a gear tooth. See ANSI/AGMA 1012-G05.
4.2.2 Profile angle
The standard profile angle is 20 degrees, and is recommended for most applications. In the annexes, data may be found on 14-1/2 and 25 degree profile angle systems. Profile angle of helical teeth is taken in the normal plane.
In certain cases, notably some sintered or molded gears, or in gearing where greatest strength and wear resistance are desired, a 25 degree profile angle may be required. Profile angles greater than 20 degrees tend to require the use of generating tools having very narrow point widths. In addition, larger profile angles require closer control on center distance tolerance for those gear trains in which backlash is critical.
In cases where considerations of angular position or backlash are critical, and where both pinions and gears contain relatively large numbers of teeth, a 14-1/2 degree profile angle may be desirable. In general, profile angles of less than 20 degrees require a greater amount of modification to avoid undercut problems, and are limited to larger total numbers of teeth in gear and pinion when operating on a standard center distance.ANSI/AGMA 1003 pdf free download.
ANSI/AGMA 1003-H07 pdf free
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