AGMA 93FTM6-1993 pdf free.Effect of Radial Runout on Element Measurements.
A test procedure was used to examine the accuracy of the equations given above.
A special helical test gear was designed and manufactured. See Table 2(a) for the gear design data and Table 2(b) for the additional calculated gear data required by the equations. The gear itself was made with very, 1ittle Runout with respect to its datum bore. It was also very accurate in terms of the other element variations. Heasurements this test gear, made relative to its bore, are listed in Table 3.
Bccentricity was introduced into this gear by two methods, each selected to suit the gear locating feature on the inspection equipment used for the spe ic measur ement.
One method involved the use of a special arbor with center holes at each end and an outside diameter ground eccentric to the centers, with the direction of the eccentricity identified. When fitted snugly into the gear bore with the orientation of the eccentricity controlled, this arbor introduced the specified runout magnitude and direction. In the second method, the test gear was mounted on the rotating. table of the inspection equipment with its bore displaced from the_ table axis So as to introduce.  similar runout. The data defining the eccentricity and other aspects of the inspection set-ups are given in Table 2(c). Related data used in the equations and calculated from a combination of gear and set-up data, are listed in Table 2(d).
The test gear. with its superimposed runout. was inspected using both. ‘ traditional’ equipment and . computer controlled ‘ equipment. (The results were essentially the same and only those from the latter are reported here.) Measurement traces are shown in Figures 14(a), (b)， and (c). selected measurement data are 1isted in Table 4.
Calculated Measur ements
Using the set-up data and the design data listed in Table 2, selected measur ement data was calculated for comparison to the actual measurement data. This comparison is shown in Table 4. The smal1 differences can be attributed to some approximations in the set-up positioning of the probe, to the small variations in the test gear, and to the inherent variability in the measurement processes Comments and Recommendat ions
The equations presented here can be used to evaluate the effect of Runout (due to eccentricity) on the other element Variations. If future versions of the AGHA Inspection Handbook will continue the practice of defining these other Variations as to include the effect of Runout, then the equations for the tolerances should be revised to incorporate the results from these equations. For example, Profile and Pitch tolerances should reflect. the fact that the same Runout adds more. to each of the corresponding Variation in gears with smal1 numbers of teeth than it does in gears with large numbers of teeth.Also, Tooth Alignment tolerances for helical gears should reflect how the contr ibution of Runout to Tooth Alignment Variation is effected by the relationship of face width to lead and not merely by face width by itself.
The AGMA Handbook should also consider defining additional (or substitute) Profile, Index and Pitch, and Tooth Alignment Variations from which the effect of Runout has been removed. Such variations will better predict how the gear with perform in operation where eccentricity. has, at best, a secondary. inf luence. Separating the effect of Runout from the current types of measurement. data is now practical with modern data processing techniques. Numerical methods suitable for such calculations should be developed and published in an AGHA document.AGMA 93FTM6 pdf free download.