B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
B23F—MAKING GEARS OR TOOTHED RACKS
B23F9/00—Making gears having teeth curved in their longitudinal direction
B23F9/04—Making gears having teeth curved in their longitudinal direction by planing or slotting with reciprocating cutting tools
B23F9/06—Making gears having teeth curved in their longitudinal direction by planing or slotting with reciprocating cutting tools having a shape similar to a spur-wheel or part thereof