Not sure if anyone mentioned, spiral hobs will not work unless your hob can be tilted to the required angle of the hob cutter. Even for straight teeth, it's at least 1.5°. Usually, I do this with a dedicated live tool that has an adjustable angle or a mill turn machine (DMG Mori NT/NTX series machine). You can get a cutter made up to cut the profile, but it's one tooth at a time and very slow.
Phil T. The Feral Engineer Check out my LinuxCNC tutorials, machine builds and other antics at www.youtube.com/c/theferalengineer On Thu, Mar 11, 2021, 1:31 AM Chris Albertson <albertson.ch...@gmail.com> wrote: > I'm looking for advice on gear cutting. I've got a low-end harbor freight > mill with a 4th axis added (actually a rotary table) and I want to cut some > module 0.5 spur gears. I know that the smaller the gear the more precision > is required. These need to be as strong as possible too. They need to > survive impact loads. What's the best kind of steel to buy that gives a > combination of machinability on a small mill and strength. I'll buy either > a set of involute cutters or a commercially made hob in 0.5 size. > > Given my setup, a HF mill and manual (non-CNC) HF mini lathe which would > have the best result, a hob or an involute cutter? > > The really hard part that I don't know how to do is a ring gear. I can't > figure out how to cut internal teeth. I might just buy these if they > can't be machined. > > If this works I need about 60 total gears plus all the ones I used for > testing > > Yes I can 3D print these but plastic would not be strong enough. > > -- > > Chris Albertson > Redondo Beach, California > > _______________________________________________ > 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
