Morning guys,
I'm currently cutting the brass frames and progress is slow. I'm also trying to figure out how to motorise this and maintain some decent looks as sticking a motor under it is clearly going to increase the size of the base.

The tooth form is not cycloidal like a true clock but instead a standard involute form. My understanding is that this tooth form would have a little more freedom in meshing. They actually mesh with no problem at all. As I mention in the video, I used a different cutter module on one tooth count than I did for the others, again to try and get a better fit. It worked fine but I would have hand filed any issues down if they had have been apparent. I also thought I may have to run them in a little on the lathe and although I did try them on the lathe, it didn't need it.

Quote:But the text describes something else: one gear moving backwards

It's all in relation to one another! All three are driven off a common gear. One of three has the same teeth and therefore turns at the same rate. One wheel has more teeth and therefore does fewer revs per rotation and another wheel with less teeth and therefore more revolutions in relation to the driving wheel. Consequently, when you stack these up, in relation to each other, one stays still, one goes forward and one goes back (they are just turning slower). That is my understanding of it all.... Haha I'm building it but I really could be wrong!