Tolerances and Surface Finish
Hydroforming is capable of producing parts within tight tolerances including aircraft tolerances where a common tolerance for sheet metal parts is within 0.76 mm (thirty thousandths of an inch). Then metal hydroforming also allows for a smoother finish as draw marks produced by the traditional method of pressing a male and female die together are eliminated.
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—Quentin Crisp (b. 1908)
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Steal in by window, chink, or hole,
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—Ralph Waldo Emerson (1803–1882)