The AGMA Technical Division recently announced the following publications:

AGMA 925-B22, Effect of Tribology and Lubrication on Gear Surface Distress (Replaces AGMA 925-A03, Effect of Lubrication on Gear Surface Distress)

AGMA 925-B22 covers lubricant-related damage modes in gear teeth. Various methods of gear surface distress are included, such as scuffing and wear, and micro- and macropitting. This document contains additional information about lubricant viscometric data, Dudley’s regimes of lubrication theory, surface roughness measurements, EHD theory, FZG lubricant test rigs, Gaussian theory, flow charts, and example calculations.

AGMA 943-A22, Tolerances for Spur and Helical Racks

This information sheet establishes a tolerance classification system relevant to manufacturing and conformity assessment of tooth flanks of a single piece spur or helical rack. It specifies definitions for rack flank tolerance terms, the structure of the flank tolerance class system, and allowable values.