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2. Broaching (metalworking) - Wikipedia

   en.wikipedia.org/wiki/Broaching_(metalworking)

   Modular broaches are commonly used for large internal broaching applications. They are similar to shell broaches in that they are a multi-piece construction. This design is used because it is cheaper to build and resharpen and is more flexible than a solid design. [14] A common type of internal broach is the keyway broach (C & D).

3. Key (engineering) - Wikipedia

   en.wikipedia.org/wiki/Key_(engineering)

   Broaching is primarily used to cut square cornered internal keyways. The specific broach, bushing and guide are used for each given keyway cross-section, which makes this process more expensive than most of the alternatives. However, it can produce the most accurate keyway out of all the processes.

4. Shaper - Wikipedia

   en.wikipedia.org/wiki/Shaper

   Keyways in the hub of a pulley or gear can be machined without resorting to a dedicated broaching setup. Dovetail slides; Internal splines and gear teeth. Keyway, spline, and gear tooth cutting in blind holes; Cam drums with toolpaths of the type that in CNC milling terms would require 4- or 5-axis contouring or turn-mill cylindrical interpolation

5. Gear cutting - Wikipedia

   en.wikipedia.org/wiki/Gear_cutting

   This method also works for cutting internal splines. Another is a pinion-shaped cutter that is used in a gear shaper machine. It is basically when a cutter that looks similar to a gear cuts a gear blank. The cutter and the blank must have a rotating axis parallel to each other. This process works well for low and high production runs.

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9. Gear manufacturing - Wikipedia

   en.wikipedia.org/wiki/Gear_manufacturing

   Broaching can also be used to produce gear teeth and is particularly applicable to internal teeth. The process is rapid and produces fine surface finish with high dimensional accuracy. However, because broaches are expensive and a separate broach is required for each size of gear, this method is suitable mainly for high-quality production.