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Gear shaping

Chip-breaking process where internal gears are machined using cutters shaped like the tooth space.

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Illustration of Gear shaping

The process

This method is similar to a large extent to gear planing, but the biggest difference is that this method can also be used to create internal gears. The cutting tool is shaped like a gear or a single toothed cutting tip is moved axially against the workpiece inner diameter. Tool movement is repeated until the sought after tooth depth is reached. This single cutting process is repeated for each tooth. The gear shape cutting process is continued by slowly rotating both tool and workpiece, while the tool continues the axial oscillating movement.

Gear planing
Chip-breaking process where gears are planed using cutters shaped like the tooth space.
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Advantages and disadvantages
In comparison with alternative methods
Shorter cycle times
suitable for mass production of large gears
Tight tolerances are maintained
Can generate gear teeth near the shaft
Only one type of cutting tools for the same module of the gear teeth
Cannot produce worm and worm gear