On Fri, 24 Jul 2020 at 08:33, Gregg Eshelman via Emc-users <emc-users@lists.sourceforge.net> wrote: > > For gear cutting every pitch or module has either one hob that cuts any > number of teeth, which requires a machine able to synchronize rotation of the > hob and blank, or a set of 8 different single tooth cutters, each of them > marked with a range of the number of teeth on a gear they're suitable for. > For Diametral Pitch gears there are also two different Pressure Angles, 14.5 > or 20 degrees. Thus a complete DP set has 2x the number of cutters than there > are for metric Module or Mod gears.
Not all Module (metric) gears are 20 degrees PA, sometimes you find 14.5. (And, technically you could quote metric DP or imperial Module. A 14DP inch gear is a 0.071428571428571 inch Module gear) Did my list of suppliers of involute gear cutters make it to the list? The conversation continued round it as if the question remained unanswered. -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1912 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
