|THRASHING AND CONCAVES
There has always been some confusion about what happens in the rotor or conventional combine when it comes to thrashing. The cylinder bars or rotor bars FEED the crop only, and the concave bar thrashes the crop. Notice I said concave bars because it is the square edge on the concave bar that restricts the flow of grain and forces the crop to rub on itself. Thrashing is the act of grain rubbing on grain. So the important thing here is to have a good square edge on your concave bars. The more square the edge of your concave bar the better the thrash. When a concave is worn-out (1500 hours on all machines) you will do two things to make them thrash better. You must run your cylinder or rotor FASTER & TIGHTER, both of which will damage your crop. Combine dealers will seldom try to sell you a concave, but rather demonstrate to you a new combine - that has a new concave in it. In rebuilding a concave we start by rewelding the framework of the concave, build-up the worn-out bars, hardface the leading edges, then grind the edges true, polish each bar, add any new parts that are needed, and guarantee the concave for 3000 hours.
| "The CUT_OUT ROTOR BAR" and "THE CUT-OUT CYLINDER BAR"
The CUT_OUT rotor bar or cylinder bar is a bar that makes life a lot easier when trying to thrash hard to feed crops. This is a process that started over 25 years ago and has been very successful in all crops for a long time. We remove every other tooth in your rotor or cylinder bar, grind it smooth, and then add weld and hardfacing material to the teeth that are left. The thing that makes your original rotor or cylinder bar aggressive is a square edge. The tooth is flat across the top and square down to the base of the bar. When the square edge of the bar gets rounded, the aggressiveness lessens, and your efficiency is no longer maintained. The removal of the tooth opens the area up, gives more space, and helps with the aggressiveness of the bar. The build-up and hardfacing adds to the aggressiveness and also the longevity of the bar. All bars are then balanced and numbered for easy installation.
The rumble that you here in the rotor is the noise of inefficient feeding. When the load it too great or when it is too heavy or when the rotor bars are not aggressive enough to carry the crop over the concave and grate section, you hear a rumble. We believe that the rumble problem starts in the front of the rotor and continues all the way to the back. The part that makes the rotor aggressive is the rotor bars. The part that moves the crop is the vains. The specialty rotor is more aggressive than the conventional rotor because it has more space between each bar whereas the conventional rotor has no space between its bars. On the other hand the conventional rotor is a better thrashing rotor than the specialty rotor because it has more bar to concave contact. Rotor rumble can be eliminated by first installing a more aggressive rotor bar and then installing THE DISRUPTER.