AGMA 2000FTM3-2000 pdf download.Comparison of New Gear Metallurgy Documents, ISO 6336-5 and AGMA 923 with Gear Rating Standards AGMA 2001 and 2003.
2.1 Basic assumptions
This paper does not In any way replace the referenced standards.
The knowledge and judgement required to evaluate the items discussed in this paper and the referenced documents comes from years of accumulated expenence in gear design, gear manufactunng, and gear metallurgy. These documents are not intended for use by the engineering public at large. Those not meeting the stated requirements should be cautious and seek the advice and counsel of those meeting the requirements.
All of the referenced documents require that all criteria in any given grade must be met in order to qualify for use of the stress number allowable for that grade. There is no partial credit in these gear rating standards for meeting or exceeding some, but not all, of the cnteria. The careful user of the referenced standards will find that documented experience and good engineering, whatever that is, permits use of allowable stresses other than those given in the referenced standards.
All of the referenced documents have provisions such that unless otherwise specified, proper process control, with periodic verification, is an acceptable method to meet the requirements of that document.
It should also be noted that all of the referenced documents are consensus-based documents. As such they rely on the experience and expertise of all those who participate ui creating the documents. Unanimous agreement is not necessary. Only substantial agreement is necessary. Individual and special cases are not included. Actual test data in suppQrt of detailed information is not required for admission into these documents.
2.2 Inclusions and exclusions
AGMA 923 and the referenced documents address only the tooth areas of gearing, but not the other features such as shafts, bearing surfaces, sphnes, keyways, hubs, and webs.
AGMA 923 unlike ISO 6336-5 does not discuss allowable stress numbers or case depth specifications. These topics are considered by AGMA to be within the domain of the ratings committees.
Carbonitriding, nitrocarbunzing and cast pinions are not covered by any of the referenced documents. The only exception being that ISO 6336-5 does cover nitrocarburizing.
The surface hardened (SH) Grade 3 applies only to induction hardening with Type A (contour) pattern. Note that AGMA 6002 includes allowable stresses for SH Grade 3 but AGMA 2001 and 2003 do not.
2.3 Cautions
Meeting the requirements of one or more of the referenced documents does not imply that the requirements of any of the other referenced documents are met. This is especially true between the AGMA and ISO documents. including the versions that will soon be published.AGMA 2000FTM3 pdf download.