gear teeth spalling

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Tooth Interior Fatigue Fracture — Tooth Interior Fatigue Fracture, (TIFF), is a type of gear failure. The failure is characterised by a fracture at approximately mid height on the tooth of the gear. This distinguishes it from a tooth root fatigue failure. The crack for a TIFF is… … Wikipedia
hand tool — any tool or implement designed for manual operation. * * * Introduction any of the implements used by craftsmen in manual operations, such as chopping, chiseling, sawing, filing, or forging. Complementary tools, often needed as auxiliaries to… … Universalium

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