Methods of examining large ring gear teeth to detect surface breaking discontinuities have often been time-consuming and limited in terms of data collected. Methods such as visual and magnetic particle inspection can miss critical discontinuities. However, a new ASTM international standard provides a more effective method for gear examination using eddy current array, a technology that has been widely used but, until now, not standardized.

Readers respond to our "Job Shop Lean" column and the "My Gear is Bigger than Your Gear" article.

When a customer needed gears delivered in three weeks, here’s how Brevini Wind got it done.

Readers respond regarding the article from March/April 2013.

Industry battles it out for World's Largest Gear title.

This paper introduces mandatory improvements in design, manufacturing and inspection - from material elaboration to final machining - with special focus on today's large and powerful gearing.

A road map is presented listing critical considerations and optimal use of materials and methods in the construction of large gears.

An overview of nondestructive testing and its importance in the manufacture of big gears.

The large gears found in mining, steel, construction, off-road, marine and energy applications—massive and robust in nature—need to tackle the greatest production demands. This, in turn, means that a special emphasis must be put on the heat treating methods used to increase the wear resistance and strength properties of gears this size.

In the wide, wide world of moving parts, the gears required for the big jobs—the really big jobs—often experience big problems. Proper lubrication of these gears is paramount in industrial applications such as wind turbines, kilns, sugar mills, crushers, heavy construction, offshore drilling rigs, mining and quarrying.