Combines Do gleaners ever use concave coversIJ

We run two or three filler bars in most all crops. Especially because some of our wheat is very hard to knock out. This allows crop to thresh better before allowed to go to cleaning system. This set up gets close to what the conventional Gleaners (like l's and M's) have. I don't think we would need any filler bars if we had to switch concaves to extremly narrow spaced wire for some crops like some brands do.

The other rotaries use coverplates to keep stuff in the rotor cage for improved threshing in the threshing section, especially if they are using wide corn or bean concaves when trying to thresh wheat. IF partially threshed heads get out of the cage too soon they either go out the back or wind up as "white caps".

John, Then it would appear they would reduce capacity and increase power needs. Wonder if the new deere rotor still needs covers.

Then a natural flow gleaner would benefit from a larger cage-cylinder combinationIJIJIJ Back in the close grate days "C_A combines" it was more grates in tough to thresh crops and of course proper clearence and cyl. speed. Point being we got the crop in the bin with a lot less separation capacity. Isn't the f2 cyl. bar in the separation section because of hard to thresh cropsIJ What does not quite add up is the new cfc at 24"'s, just how well does it really work in tough to thresh small grain varitiesIJ tj seem to have a point in his critic of the new rotor.

Yes the STS needs cover plates. Seems they have a threshing problem in hard to thresh small grains. As mentioned on the loewen site the cover plates also help or modify the MOG distribution on the shoe which can be a problem, especially for single axial rotor machines. No distributing augers...

Yes I see no problem with larger cage-cylinder combo. I'd suggest they use same size as new TBA class 8 or 9 and share rotor drives and engines. There is alot of potential left in the Natural flow but don't see it happening. Never say never though. Your right about the old closed grate systems. I think it has all to do with how well you use the area available. Size does not matter at all at times. Wasn't around much when the rasp bar was used in place of the channel bar in the old closed concave days but remember dad had them in the bin. I think tbran related what it would do for the old closed concaves when he decided to try in belly of separator on rotaries. I think they have the potential of opening up the straw mat to allow seeds to escape. Don't know how well they worked at completly threshing the hardest to thresh crop as compared to channel iron but likely worked very well at stripping seeds from head. Tid bits I hear on CDF in hard to thresh small grain is they worked just as well as normal rotor. One report said it left straw more ground up than with normal rotor. This may of been eliminated by removing knife kickers but wasn't a problem. I have a feeling that I will have some longer kickers (sweeps) on one of these rotors someday. Time will tell. Have a good day.