The weak link on all 3D printed harmonic drives is the flex cup. The plastic fails after some hours of use. The best design I've seen to overcome this is to NOT print the flex cup. They used a wide double side timing belt for the inner teeth.
The thing that very few You tubers do when designing 3D printed machines is to not simply copy the design of metal parts but start the design from the ground up knowing they will be using plastic. Plastic has very different strength and stiffness to volume ratios. So if your part looks like the metal equivalent it is a good clue you are doing "eyeball engineering" and your experience with metal is influencing your design. If you need to print a reduction gear and need a really big ratio the Cycloidic reduction system really does work better especially if the rolling parts are sealed bearing units that are press-fit into the plastic. That said, I've printed parts in plastic to directly replace metal or even rubber and I just have to accept the very short lifetime and low strength. Plastic is a good material to verify ideas quickly. In any case, use a timing belt for the flex wall and it might last 30 years. On Mon, Jan 25, 2021 at 8:47 PM Sam Sokolik <samco...@gmail.com> wrote: > I am sure the torque is limited - but I feel it might have possibility... > > https://www.youtube.com/watch?v=QlpkmEEhFqc > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
