This is a potato harvester , simple design , in front of the conveyor is a knife digging soil and goes to the conveyor, conveyor then sifted soil , everything depends on the soil you have, the ground where we planted potatoes is the tough clay so we'll see if this harvester can do the extraction of potato , conveyor is made that we took two chain and welded pieces of flat steel 2 cm long and 0.5 cm wide , between these pieces we weld steel rod , works perfectly still remains to test it on the extraction of potato