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Although accuracy grade A12 is not directly addressed by ANSI/AGMA 2015-1-A01, there is no evidence that the use of the Av = 12 curve is not proper for lower accuracy gear sets (i.e., Av > 11). ANSIAGMA 2001-C95 . Question 2: If this is the case, why is there a curve for Av = 12, when AGMA 2015-1 only covers quality classes A2 to A11? AGMA’s response: The figure was constructed by re-labeling the curves in ANSI/AGMA 2001-C95. Home - AGMA Menu link Standards Membership Events & Training Newsroom Technical Committees Home Store About Us Contact AGMA . Connell Award Old Goats Award Advanced Gear Engineering Academy AGMA Gear Education Instructors 2016 FTM Speaker Bios ANSI/AGMA 2001-D04 ANSI/AGMA 2001-D04, Fundamental Rating Factors and Calculation Methods for Involute Spur and Helical Gear Teeth Comment restated: Section 8 on dynamic factor seems to have been updated to include the new ANSI/AGMA 2015-1-A01 tolerance standard. Below equation 26 the following is stated: “Pnd is normal diametral pitch (in-1), where 0.5 ≤ Pnd ≤ 20;” Does this mean that the method is only valid if the diametral pitch is not finer than 20? What can one do if you have a fine pitch gear not specified according to AGMA 2015-1? AGMA’s response: Equations 25 and 26 are derived from ANSI/AGMA 2015-1-A01 equations 3 and 4. Question 3: Since AGMA 2015-1 has an applicable range of normal module 0.5 to 50 (i.e., normal diametral pitch 0.508 to 50.8), is the same module range represented by the graph in figure 1? AGMA’s response: Figure 1 is not limited as a function of module. See annex A for use with AGMA 2000-A88.” Question 1: Does this standard (ANSI/AGMA 2001-D04) numerically correlate the AGMA 2015-1 accuracy class number with the value of Av? That is, if one has an AGMA quality class A9 product, we are to select curve Av = 9 from figure 1? AGMA’s response: The value of pitch and profile accuracy class as defined by AGMA 2015-1 may be used as the value for Av in absence of an evaluation of transmission error as discussed in the standard.