Experimentation is the answer. I run 4" twisted chisels on my 9 shank Unverferth. The two front ones are 30" apart. If you turn them towards the center, they can actually ball up a wad of tough residue in the right conditions. If you turn them out, they are throwing dirt right on the tires/rims. They will build a big cone of dirt right out on the wheel, then dump it right where you don't want it- like in the road or driveway. The two outboard rear ones are shown turned out. But I turn them in because I don't want to be throwing dirt off the edge of a field onto a lane, into a ditch, etc. But I still get ribbons of sod thown out here and there along grassy edges. To me the biggest issue is trash. The coulters behind the tractor tires are useless as all those tires do a better job of crushing and breaking up stalks, etc. than anything. So the machine ought to be made with all the chopping action concentrated in the middle. Good luck.
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Today's Featured Article - Picking Corn - by Rick Nikolich. It was the day before Christmas shutdown at work and I asked our lead engineering expert Scott Andrzejewski what he was going to do over the holidays. He said that he had some corn that he still needed to pick with an antique one-row New Idea corn picker. Scott has a nice farm about an hour north of Lansing in St. Johns, MI. He wanted to get the rest of his corn in by the next day (Christmas Eve). We had about an inch of new snow on the ground and single digit temperatures. So in the bac
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