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Calculated Gear Life Values

The article "Calculated Gear Life Values" appeared in the May 2018 issue of Gear Technology.

I have a query (regarding) calculated gear life values. I would like to understand for what % of gear failures the calculated life is valid? Is it 1-in-100 (1% failure, 99% reliability) or 1-in-one-thousand (0.1% failure)?

gear life, rating, S-N curves, reliability factor, AGMA 2001, ISO 6336, EES KISSsoft

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