Which range and precision is recommended for approximation of involute inverse ?

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Serge V. Shil’ko

The approximation by arcs and splines is enough effective. The required precision of approximate expression is determined by class of gears accuracy.

Jean-Francois Antoine

Enough effective corresponds to what precision? And up to which angle are you usually working? I saw some table up to 60 degrees.

Franco Concli

Regarding the answer of Serge, the max errors for each class of quality for gears can be extrapolated from the ISO 6336 standard.

Franco