the the physical dimension of the machine, including basket radius, filtering screen and screen aperture. The operation variables are rotational speed and volumetric feed flow rate while the feed variables are liquid to solid (L/S) ratio and cassava root characteristics (Saengchan et al., 20 The characteristics and chemical compositions of cassava root depend on variety, age and environmental growing condi tions (Galliard and Bowler, 1987). Starch loss in the process mainly occurs due to inappropriate design and operation. of the extractor (Schwille et al., 2002). The starch loss with pulp residues are approximately US$2 million annually in one factory with a capacity of 200 t a day (Saengchan et al 2014) The affecting variables on total starch production efficiency have been studied. However, the research did not fully describe the starch granule characteristics and the effects of centrifu gation and filtration on starch granule and pulp separation