Converting a garden "Rapid Shredder" into a "Super Shredder"

CAUTION: Do not try this at home. 

Safety features essential for general use have not been added to the prototype shown here.

This modification to a garden "Rapid Shredder" was inspired by the design of a pencil sharpener, where rotating blades in a conical arrangement reduce the size of a pencil as it enters further into the sharpener and closer to the point where the blades converge. 

Leaves and branches shredded in the "Super Shredder"

The adaptation from the pencil sharpener design makes use of a funnel-shaped metal container with a series of circular saw blades spinning in its central axis. 

Garden waste fed into the top slides down the funnel until it encounters one of a number of vertically spaced blades when it is too big to fall further.

 

The plastic dome in the centre forces the garden waste towards the cutting blades

Smaller pieces of garden waste ripped off by the highest circular saw blade then slide further down the funnel until they encounter the next circular saw blade. 

When the pieces of garden waste are smaller than the gap between the lowest circular saw blade and the wall of the funnel, they drop out the bottom of the funnel to be flung out of the "Super Shredder" by the cutting wheel retained from the original "Garden Shredder".