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It is not intended to assure the performance of assembled drive gear systems. It is not intended for use by the general engineering public. Instead, it is intended for use by the experienced gear designer who is capable of selecting reasonable values for the factors in these formulae based on knowledge of similar designs and awareness of the effects of the items discussed.
The formulae in ISO are intended to establish a uniformly acceptable method for calculating the pitting resistance and bending strength capacity of cylindrical gears with straight or helical involute teeth. ISO includes procedures based on testing and theoretical studies such as those of Hirt , Strasser  and Brossmann . The user of ISO is cautioned that when the methods in ISO are used for other helix angles and pressure angles, the calculated results will need to be confirmed by experience.
The rating formulae in ISO are not applicable to other types of gear tooth deterioration such as plastic yielding, scuffing, case crushing, welding and wear, and are not applicable under vibratory conditions where there may be an unpredictable profile breakdown.
The bending strength formulae are applicable to fractures at the tooth fillet, but are not applicable to fractures on the tooth working surfaces, failure of the gear rim, or failures of the gear blank through web and hub. ISO does not apply to teeth finished by forging or sintering. It is not applicable to gears which have a poor contact pattern.
The procedures in ISO provide rating formulae for the calculation of load capacity, based on pitting and tooth root breakage.
The start and finish of text introduced or altered by corrigendum is indicated in the text by tags. Text altered by ISO corrigendum June is indicated in the text by? A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. The work of preparing International Standards is normally carried out through ISO technical committees.
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BS ISO 6336-3:2019