Hi Andy, Let’s say I were to purchase a hob like this one:
https://www.ebay.com/itm/DP16-PA14-5-Gear-Hob-Cutter/302306779664?_trkparms=aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D227672%26meid%3Dd1b784222bed4e2a9a9180c0104f7f6c%26pid%3D100005%26rk%3D1%26rkt%3D12%26mehot%3Dpf%26sd%3D331272003959%26itm%3D302306779664%26pmt%3D1%26noa%3D0%26pg%3D2047675%26algv%3DSimplAMLv5PairwiseWebWithBBEV2bDemotionZeroArw%26brand%3DUnbranded&_trksid=p2047675.c100005.m1851 <https://www.ebay.com/itm/DP16-PA14-5-Gear-Hob-Cutter/302306779664?_trkparms=aid=1110006&algo=HOMESPLICE.SIM&ao=1&asc=227672&meid=d1b784222bed4e2a9a9180c0104f7f6c&pid=100005&rk=1&rkt=12&mehot=pf&sd=331272003959&itm=302306779664&pmt=1&noa=0&pg=2047675&algv=SimplAMLv5PairwiseWebWithBBEV2bDemotionZeroArw&brand=Unbranded&_trksid=p2047675.c100005.m1851> How do I determine the lead angle? Is a standard lead angle used for certain DP/Module sizes? Or do I need to make some measurements to determine the lead angle of that particular hob. Matt > On Jul 24, 2020, at 8:50 AM, andy pugh <bodge...@gmail.com> wrote: > > On Fri, 24 Jul 2020 at 12:23, andrew beck <andrewbeck0...@gmail.com> wrote: >> >> 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 > > Those are zero-lead profiled cutters. You can use those on any mill > (or lathe, in many cases) > > You can also use the rack-form cutter from those sets to generate > teeth one-by-one on a CNC milling machine: > https://youtu.be/SJQtx80euGM?t=172 > (or, as shown in that video, a single-point tool) > > Or you can go the whole way and hob on your CNC mill, with spiral > hobs. If you can set the work and spindle at the required angle. > Vertical mill, poor video: > https://youtu.be/ZhICrb0Tbn4 > Horizontal mill, better video > https://youtu.be/xdE46yvckbM > > Your ball-nose mill approach, though, is the only easy way I know of > to make bevels, especially spiral bevels, without a specialised > machine. > > -- > 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
