>> P.128
4-1TechnicalTerminologyOtherContactmodulusCoefficientdeterminedbytheballdiameterandcurvatureradiusContactellipseGrooveradiusGroovecurvatureAreaanditsshapewheretheballandracewaysurfaceareincontactCurvatureradiuswithintheaxialplaneoftheracewaygrooveRacewaygroovecurveshownasaratioofthegrooveradiusandballradius128