In addition, a service factor is only valid with the calculation method used C. It is affected primarily by results from helix error, misalignment, or pinion the correctness of the profiles of mating teeth: The four curves of figure 7 provide effective mesh alignment. Defects such as surface cracks, AGMA application standard exists, numerical values grinding temper, or tooth root steps may invalidate may afma estimated for the factors in the general calculations of pitting resistance and bending formulas, and the approximate pitting resistance and strength. The definition of acceptable initial pitting varies widely with gear application.
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More info Rating formulas This standard provides a method by which different gear designs can be theoretically rated and compared. It is not intended to assure the performance of assembled gear drive systems. These fundamental rating formulas are applicable for rating the pitting resistance and bending strength of internal and external spur and helical involute gear teeth operating on parallel axes. The formulas evaluate gear tooth capacity as influenced by the major factors which affect gear tooth pitting and gear tooth fracture at the fillet radius.
The knowledge and judgment required to evaluate the various rating factors come from years of accumulated experience in designing, manufacturing, and operating gear units. Empirical factors given in this standard are general in nature. AGMA application standards may use other empirical factors that are more closely suited to the particular field of application. This standard is intended for use by the experienced gear designer, capable of selecting reasonable values for the factors.
It is not intended for use by the engineering public at large. Exceptions The formulas of this standard are not applicable to other types of gear tooth deterioration such as plastic yielding, wear, case crushing and welding. The formulas of this standard are not applicable when any of the following conditions exist: - Damaged gear teeth. The effect of this under-cut is to move the highest point of single tooth contact, negating the assumption of this calculation method.
However, the reduction in tooth root thickness due to protuberance below the active profile is handled correctly by this method. The J factor calculation uses the stress correction factors developed by Dolan and Broghamer. These factors may not be valid for root forms which are not smooth curves. For root profiles which are stepped or irregular, other stress correction factors may be more appropriate. Scuffing criteria are not included in this standard.
This information is provided for evaluation by users of this standard, with the intent to include a scuffing evaluation method in a future version of this standard. Design considerations to prevent fractures emanating from stress risers on the tooth profile, tip chipping, and failures of the gear blank through the web or hub should be analyzed by general machine design methods.
AGMA 2001-D04 PDF