Combines Fines in corn sample R62

Bottom sieve should be closed more than the top. I would open the top (5_8) and close the bottom to (3_8) and float it back though the cly. I run rotor 290-300rpm but I'm in dryer corn, my concave is at 10 and have the fan choked down to 3.5. But this is a R-52, I think the setting should be the same as the 62.

How about the corn itselfIJ I can get a nice clean sample in our 42, but we just cleaned a bin out this morning, of corn we picked last week and there were a lot more fines in the bottom than I have seen in years. We are picking at 17 to 18 %. Also on that note. I have noticed butt shelling to be more severe this year. We did notice the corn kernals on the butt end are more pronounced. OR should I say the butt end is breaking off more toward the inside of the cob, thus making the butt kernals, the first thing to get hit and at the curved formation of the butt end due to this, there are only a few kernal taking the blow, not several like in ear corn we would recognize. I hope that made sense in my thought process, I wish we could post pictures here! Yeilds are good though. Hope the same for everyone else here. Thanks.

I have an R42 but here is where I start before tweaking everything. Top chaffer @ 1_2, bottom sieve @ 1_2, concave 10 and air @ 5 1_2. If you close top chaffer down too much you'll lose the air flow to float the trash. If you squeeze the bottom sieve to tight, it won't let the big kernels fall through and you'll end up grinding them up as they continue to go through return. Some hybrids are worse than others for cob breakage and at 27% the cob could be a little soft and maybe that could be causing more cob in the hopper. Not sure which chaffer you are using, but I use the short tooth round end for both corn and beans and have done the chaffer mod. I bought a long tooth square end but I couldn't get as clean of a sample. Anyway, this is what works best for me. Good luck......Dan

Morning Jr64, Kevin, IowaDan, whew! I am not far off and I feel better about what I was getting accomplished! Here is where I am running presently in 200+ bushel corn 18% moisture with our stock R42, 6 row 30".(not bragging, just giving a point of reference for our settings) We have the long tooth square chaffer. No mods on anything, two reverser bars in the rotor. Upper sieve, chaffer @ 5_8"- lower sieve, shoe @ 1_2"+ (I agree, no need to reprocess clean grain) Concave I am running around 200 rpms, the faster I run it from there, the more loss I get. Set now on 7.0 Grate set on 7.25 Ground speed 1.3 mph. Heavier corn 1.0 or less or I loose it out the rotor. Ok, I took about a half a day and burned up 4 acres (and 4 hours) out of our 45 acres, to get this set due to a lot of plot work depended on a good setting. I started at 2.5 mph like last year with the setting on my sheet I wrote down. Corn, last year's was around 150 bushel. Not really expecting much better corn this year. I first slowed ground speed down. That helped. I then got the grain tank pretty clean, a few small bits of cob, mostly when I turn around, note we have 2, 4 and 10 acre fields with 300 to 800 feet length of passes, a lot of turning around. (I grease my rear axle every morning.)The plot work we do is not varieties, but farm practice comparisons, mostly the same variety corn through out. I got to the point I was loosing about 5 bushels no matter what. I found 1.5 coming from the head, we tightened down the striper plates to 1" in front and 1 1_8" rear and slowed it down as slow as it would go. Helped a lot with most corn, one variety had a thicker stock, but I got through it since it was only a 1300 ft plot, 1 round. Got that loss down below, .5 bushel. Pulled off the spreader. I found that our sieve loss was less than .5 bushel. We were ok there. Now comes the fun (as in frustrating part). the easiest way I could do this was. Adjust my grate a 1_2 setting and then run the concave up then adjust the grate again and run the concave down. Keep repeating this process for every 1_2 setting on the grate. I also would change my ground speed for each change. .5, 1.0, 1.5, 2.0 mph I found I could set the concave any place from 6.5 to 12 and have no change in loss of grain, still around 3 bushels to 4 per acre. Heavier corn more loss. Cob breakage did not change a whole lot, the least cob breakage occured above 7.0 and below 10. Note; at all times I was removing all corn from the cobs, even the little tiny ones on the tips. (that is where our fines are coming from, is at the tips of the cobs) I got to the point that the grate was open to what would be equal to 10 on its gauges. Thinking that this would open it up more, so the kernals would fall off the trash. It was worse at that setting of 10. It got better as I got closer to 7, If I got below 7 then I got more cracking and cob bits in the grain tank and losses went up dramatically. Finally frustrated and tired from all the exercise (plus lack of sleep from the previous days) not to mention running out of time. I got it to the point where it was loosing the least, but I am still not happy with what I leaving. My guessIJ I need to remove every other wire in the grate, There are kernals riding out with the husks and I have some tips getting wedged in between them in places. I suppose I will have to modify our processor this winter. I do want to thank my friend Paul, who helped me with this. It would have took much longer with out his efforts also. I know he reads this website. Any comment or suggestions I would like to hear, and no I can not buy a larger machine, that is not an option for us, we have to make this one last at least 15 to 20 years. I chatted with my AGCO dealer, and they had a call from one of their NH customers, that they could not go fast enough in a newer 9760. Found out they were getting 270 plus bushels of corn, The combine was maxed out on capacity at 3.5 mph, 8 row 30" head. Southwest Iowa bottom ground. which is a good question. What is the bushel per hour capacity of our silver machinesIJ The 4, 5, 6 , and 7sIJ Anyone have that informationIJ Or is it based on how much "trash" is going through the processor that limits youIJ Thank you,

In 150 bushel bottomland corn. With a R-52 with two reverser bars, and 8 row 30 inch hugger. When we pushed it we would fill the bin (220-230 bushels) in 7 minutes, Didn't notice any more loss at that speed, but I like to normally slow down a little (2.5 to 3 mph) and bin full at around 12 to 15 minutes.

That sounds about right, if I figure 6 row 30" It will take us about 25 to 35 minutes at 1.3 miles an hour, and that is what we are doing right now. I had an email from a friend, a former owner of a R50 and he made some suggestions, of removing every other wire in the processor. I think we will try that first. Thanks! I hope you have a good harvest!