galling
Condition whereby excessive friction between high spots results in localized welding with subsequent spalling and further roughening of the…
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Glossary Terms
gamma iron
Face-centered cubic form of pure iron. Each of eight atoms of gamma iron are located in the corner of a cube, and each of six atoms are loc…
gang cutting (milling, slitting)
Machining with several cutters mounted on a single arbor, generally for simultaneous cutting.
gantry robot
Robot positioned by means of an overhead supporting structure such as a crane or bridge-type support.
G-code programming
Programs written to operate NC machines with control systems that comply with the ANSI/EIA RS-274-D-1980 Standard. A program consists of a …
gear cutter
Cutter, such as a mill, broach and hob, designed for machining gears.
gear shaper
Machine that, in contrast to mills and hobbing machines, reciprocates the tool to cut the gear. See hobbing machine.
graphitic corrosion
Deterioration of gray cast iron in which the metallic constituents are selectively leached or converted to corrosion products leaving the g…
G-ratio
Measure of the grinding performance defined as the volume of metal removed divided by the volume of grinding wheel worn away in the operati…
gray cast irons
Alloys of iron, carbon and silicon in which more carbon is present than can be retained in austenite. The carbon in excess of austenite sol…
grinding
Machining operation in which material is removed from the workpiece by a powered abrasive wheel, stone, belt, paste, sheet, compound, slurr…
grinding machine
Powers a grinding wheel or other abrasive tool for the purpose of removing metal and finishing workpieces to close tolerances. Provides smo…