A major factor in the progress of the world: wheels and axes
The wheel and the axle are connected in two ways.  One is free from the axis and rotates on the axis.  And the same with the second axis.  Fans move freely from the front wheel axles of vehicles is.  It has to have ball bearings to prevent friction, the wheels of the bicycle rotate along the axis.  Each vehicle has an axle and wheel design as intended.
In clock-like machines, many toothed wheels rotate against each other.  These chakras are free from the axis.  Some axes only have teeth.  It helps to keep the wheel parallel to the ground and keep it in regular motion.
 
   
   
 
 
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