## Basic Gear Geometry |

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### Common terms and phrases

0X cos 0X AGMA Nomenclature Committee Allan H allel Angle 4>t axial base helix AXIAL BASE PITCH AXIAL PROFILE ANGLE base circle base cylinder base helix angle base lead angle Basic Gear Geometry bevel gears Candee center distance center pitch crown gear diameter gear axes gear teeth gears with axes helical involute gear involute rack line of centers normal base pitch normal pitch normal plane normal pressure angle NORMAL PROFILE ANGLE number of teeth parallel axes parallel planes PcPx PITCH CIRCLES FIG pitch cone pitch curves pitch cylinder pitch diagram pitch element pitch figure PITCH HELIX ANGLE PITCH LEAD ANGLE pitch plane pitch point PITCH px pitch surfaces pitch triangles Plane Axial Plane Plane of Action plane of rotation PLRHE Pn Px Px PnPx pressure angle Fig profile angle Fig PtPN PtPx reference planes Right Triangles sinfc Pn spur gears tangent plane tooth surface transverse plane transverse pressure angle transverse profile angle