How much can we trust our understanding of how things work? There was a special joint web ex meeting this week between two AGMA committees that got...

The American Gear Manufacturers’ Association [AGMA] will celebrate its 100^th Anniversary in 2016. The party will begin with the Fall Tec...

Generating gear grinding is one of the most important finishing processes for small and medium-sized gears, its process design often determined by practical knowledge. Therefore a manufacturing simulation with the capability to calculate key values for the process — such as the specific material removal rate — is developed here. Indeed, this paper presents first results of a model for a local analysis of the value. Additionally, an empirical formula — based on a multiple regression model for a global value describing the process — is provided.

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I’ve been traveling quite a bit lately, and wonder if perhaps we take the convenience of air travel for granted. Who would have expected an hour to...

Cracks initiated at the surface of case-hardened gears may lead to typical life-limiting fatigue failure modes such as pitting and tooth root breakage. Furthermore, the contact load on the flank surface induces stresses in greater material depth that may lead to crack initiation below the surface if the local material strength is exceeded. Over time the sub-surface crack propagation may lead to gear failure referred to as “tooth flank fracture” (also referred to as “tooth flank breakage”). This paper explains the mechanism of this subsurface fatigue failure mode and its decisive influence factors, and presents an overview of a newly developed calculation model.

We are having a bit of a heat wave in the Chicago area, not the deadly type of 1996, but uncomfortable for much outside activity. I marvel at the t...