HOB CUTTER FOR CUTTING GEAR WHEELS Russian patent published in 1997 - IPC

FIELD: mechanical engineering; cutting tools for cutting spur gear wheels. SUBSTANCE: teeth are located helically points of every three teeth located one after another have different angles of cut-off, viz,: 40 to 70 deg for center tooth, 23 to 40 deg for previous tooth and 70-82 for proceeding tooth, Distance between tooth point and beginning of cut-off is C_cn ≅ C_m, for center tooth; C_cn ≅ C_prv ≅ 0,8 m for previous tooth and C_prc ≅ C_prv for preceding tooth, where m is modulus of hob cutter, C is coefficient equal to 0.25 or 0.3 which is selected depending on m. EFFECT: enhanced efficiency. 2 dwg