If I understand the theory and the various article it's more a sine wave and so the teeth follow that. What does it mean? Not quite sure. The key comment I did note was that is that the teeth tips move relative to the root pitch.
Think of taking a toothed belt. Laid flat the crests are the same distance apart as the root pitch. But bend it and the distance from crest to crest changes. The root distance doesn't change but the distance between the peaks does. Otherwise toothed belts wouldn't work on other types of pulleys. The outer gear with the inner spline has the root and the crests a fixed distance apart and that doesn't change. As the cup/belt gear is turned into an elipse the tips of the teeth spread apart. Now the edges of the left and right side on either side of center tooth also touch the sides of the outer spline gear. This removes the backlash. And I believe as they contact those adjacent teeith it's in the shape of a sine wave hence that's supposed to be the shape of the teeth.. Ideally with a very small diameter carbide cutter LCNC could cut the profile of a single cutter which is then hardened and can be used to shape the inner spline gear. With the cup properly supported the outer cup gears could also be cut but they appear to have a different profile. More work needed here. John > -----Original Message----- > From: andy pugh [mailto:bodge...@gmail.com] > Sent: November-30-21 4:06 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Harmonic Drive > > On Tue, 30 Nov 2021 at 23:07, Stuart Stevenson <stus...@gmail.com> wrote: > > > Is the tooth shape an attempt to mesh in an involute fashion? > > No, because the motion of the teeth relative to each other is very > much unlike meshing gears, and so involute is inappropriate. > > -- > 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
