How would you make a pivot that would allow motion in an arc around a tube of a larger diameter by a tube of a smaller diameter? The pivot must be able to be moved along the larger tube for adjustment.
Some starting ideas:
You probably read my blog and know I am working on a design for robot legs inspired by the legs of Theo Jansen's Strandbeest.
Below is a picture of a plywood prototype on its way to become version 6.