1) Machine tool 
Hobbing is a machining process for gear cutting, cutting splines, and cutting sprockets on a hobbing machine, which is a special type of milling machine. The teeth or splines are progressively cut into the workpiece by a series of cuts made by a cutting tool called a hob. Compared to other gear forming processes it is relatively inexpensive but st...
The operation of cutting gears with a hob.
The operation of cutting gears with a hob. See also: Gear Design, Hob.