Specialty gears — especially those with complex shapes or tolerances such as spur, helical, bevel, miter, spiral, and pinion gears — have historically been components that Techtronic Industries (TTI) farmed out of its Anderson, South Carolina, campus. Mike Stephens, TTI’s engineering prototype shops senior manager, and his team had attempted to apply cost-effective and timely solutions to producing the gears, often by combining mill, lathe, and wire EDM technology, but it was not working.
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