Quote Originally Posted by nova_robotics View Post
Okay I had to watch this a few times, so correct me if I'm wrong. The o-rings are allowed to relax, and you slide the part over them making a reasonably tight fit. Then when you tighten the nut it compresses the o-rings expanding them into the ID of the part. That's smart.
It is an expanding mandrel much like you would find to expand an exhaust pipe. if you stop the video at the 1,03 you can just see the lines showing the segments. the o rings would be used to draw the segments together when released by the spanner.
A truly nice set up though. Fast and repeatable