Oops sorry Andy yep I missed it. Just had a look now. Sounds like I need to set up one of my cnc mills as a gear hobber
On Fri, Jul 24, 2020, 8:30 PM andy pugh <bodge...@gmail.com> wrote: > 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 > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
