From operations in project-based inventions about tillage cassava spin economical strength, it can be concluded that the weight of cassava 1-5 kg. It will take about 1.21 chopper increased minutes for cassava 1 kg. And labor people would take add about 2.27 minutes per cassava 1 kg. The rate of use of tillage is faster than labor about 2 imaginable. The safety of a knife chop it. And the enhancement of the body.