The Estes XPR Concave System STOPS rotor loss and volunteer yield. Our concave system solves all the threshing and separating problems mentioned above, plus some. Our concave system helps keep the rotor full and our bars have 135% more threshing surface area than stock round bars. This means more complete and faster threshing. The faster the crop is threshed the quicker we can get it down on the augers and in the tank. Additionally, because we are able to keep the rotor full, we are able to open up the concave and slow the rotor. This equates to less grain damage, fewer splits, cracks and broken kernels.
Once the crop is threshed, we are able to get significantly more grain out in the concave section preventing an overloaded rotor so more grain ends up in your tank sooner. The more crop volume we can get out of the concave section, the less has to be separated over the separation-grate section. Since there is always some grain still caught up in the crop mat (in corn shucks, tailings, etc) we have designed our Xtreme Separation Grate to fluff, toss and disrupt the crop mat capturing any loose grain before being spit out the back of the combine.