When material is loaded into the bucket, the stars rotate. 

This agitates the material, breaking it down, to create a rolling action inside the bucket. 

This action keeps material fluid to help break down the material more and fall through the gaps in the stars if small enough. 

The stars do not crush or shred, They just create the rolling action in the bucket, which screens the material. 

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The Larger material is kept in the bucket separating the different fragment sizes.

We offer three different fragment sizes with our buckets. nominal 20-0mm, nominal 15-0mm and nominal 10-0mm. This changes the boss diameter on the stars and therefore the gap the material can fall through.