I have been making my own gear cutters for thirty years , mostly cyclodal for clocks by the pin method , this can take some time so I looked for an alturnative , using an end mill that is close to size with some adjustments , a slice of 25mm silver steel mouted on a arbour , and gashed with a 1/16" slitting saw with the bottom on centre will give a 7 degree top rake , turned anouther 3 degrees and faced off .