3-Manufacturing process produces too much scrap

Problem: Tool changes diameter with rpm (steel grows under tension) causing scrap
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Group Think: Steel growing under tension is impossible to avoid by design changes
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Enabling idea (by DB): Use balanced design for zero growth
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Problem with idea: Original design unstable over rpm range
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2nd enabling idea (by JT): Shrink and curve design so stable over speed range
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Result: saved $2MM in scrap per year