With the use of angle heads, complex features can be machined with standard setups. Some features are: expansion from 90 degrees to 45 degrees or other pre-set angles, gear-driven models with 1:1 to 5:1 transmission ratios that boast of high torque at low speeds, and belt-driven types that quiet down to 20,000 RPM. They are used in five axis spacecraft machining centers for aerospace wing ribs, and automobile cylinder heads. Their use eliminates the multi-fixturing setup which reduces setup times.
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