Past and Present Cutter Systems Bevel and hypoid gears can be cut in a single indexing process (face milling) or in a continuous indexing process (face hobbing); both use cutter heads with a certain number of slot groups (equal blade groups) (Fig. 1). Each blade group consists of one to three blades assembled in the respective cutter head slots. In the case of three-blades-per-blade group, a rougher or bottom blade in each blade group roughs the convex and concave flank surfaces, as well as the root fillets and bottoms of a bevel gear. The second blade of each blade group is commonly an outside blade that finish-cuts the concave flank surfaces and the concave side root fillets. The third blade in each blade group is commonly an inside blade that finish-cuts the convex flank surfaces and the convex side root fillets.
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