Vex robotics 406 4206 hexcalator ball machine by hexbug vex 406 4206 p the vex reg robotics hexcalator teaches important scientific principals such as kinematics linkages and reciprocal motion this sophisticated machine was inspired by cutting edge medical devices and uses a hand crank to power 3 hexagonal indexing wheels to transport balls uphill where they are released onto the return ramp once constructed this machine will move the balls in a continuous loop at a rate of approximatel