Measurement institutions of seven different countries — China, Germany, Japan, Thailand, Ukraine, United Kingdom and the U.S. — participated in the implementation of the first international comparison of involute gear measurement standards. The German metrology institute Physikalisch-Technische Bundesanstalt (PTB) was chosen as the pilot laboratory as well as the organizer. Three typical involute gear measurement standards provided by the PTB were deployed for this comparison: a profile, a helix and a pitch measurement standard. In the final analysis, of the results obtained from all participants, the weighted mean was evaluated as reference value for all 28 measured parameters. However, besides the measurement standards, the measured parameters, and, most importantly, some of the comparison results from all participants are anonymously presented. Furthermore, mishandling of the measurement standards as occurred during the comparison will be illustrated.

[starbox] Watching the World Cup final reminds me of that old adage about Americans and the English being divided by a common language. For exam...

[starbox] The special 30th Anniversary Issue of Gear Technology magazine represents a lot of extra work on the part of...

[starbox] If ever a situation cried out for a short, texting-friendly acronym it is the unavoidable problem of “You don’t know what you don’t kn...

[starbox] The mailman delivered some used books to my house this week, so I expect to be blogging a bit about their content in the coming weeks....

The AGMA/ABMA Annual Meeting took place April 10-12 in St. Petersburg, Florida. Between committee meetings, networking opportunities and social events, many individuals in the gear industry were presented awards.

[starbox] The last of my uncles died this week. In my parents’ generation he was considered a successful man, despite not having a college degre...

The face load factor is one of the most important items for a gear strength calculation. Current standards propose formulae for face load factor, but they are not always appropriate. AGMA 927 proposes a simpler and quicker algorithm that doesn't require a contact analysis calculation. This paper explains how this algorithm can be applied for gear rating procedures.

[starbox] Thinking back on my experiences on the Helical Gear Rating Committee, I am a bit shocked at what hasn’t happened. As AGMA 218 was bein...

One of the most important aspects of a gear rating standard is the allowable stress charts. For spur and ...