Tank threads - with bones


I am very new to blender so please bear with me.

I need to build tank threads with bones.
My questions are 1- how do I make the bones and mesh follow a circular path.
and 2- how do I control all bones so I can slide them along a circular path and only use 1 bone to control all bones.
(so when I pull 1 bone all other bones move along a circular path and mesh moves along too)