Main Page | See live article | Alphabetical index The hobbing machine is a special form of milling machine that mills gears. It generates the gear form required by rotating the gear blank and the cutter at the same time. The cutter has a rack profile and is in the form of a helix so that the sides of the teath on the cutter generate the curve on the gear. This technique can generate involute gears, Ratchets and cycloid gears. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.