We decided to go with a 6 wheel drivetrain this year. We haven't done this at all in the past, the closest we did was a teeter drivetrain back in 08'.
So here it is:
We've been working on our arm/lifter idea. We decided to go with similar designs we did in the past with custom machined tooth plates and #25 chain running inside 80x20 The gripper pushes out and holds tubes from the inside.
