magnum_man
Guest
Gleaner will change the radius of the concave to match the smaller rotor won't theyIJ
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Combines New Gleaner Rotor continued from below
tj
Guest
They should, but I think they may be relying upon adjustment of the front insert. Still doesn't allow for separation pressure on the rear mainframe crossbars, and the insert would actually need to be moved a little to the rear for this to be effective. Another problem may also occur -- the 1_2" extra clearance of the smaller diameter rotor may allow corn cobs to be entrapped between the top surfaces of helicals and rotor bars, causing splitting or shattering. Not so much in cobs which are well dried down and have shrunk, but in larger high moisture, spongy cobs (pieces of these are more likely to plug the cage openings and sieves, as well). .
T__langan
Guest
You have a good point about the sieves plugging if cob breakup becomes a problem. We do quite a bit of high moisture corn and this is definately a problem. Most of it goes in the silo for cattle feed, so some cob in the sample is not a problem, even desireable, so we run without the lower sieve. However, we've never had any problem whatsoever with the cage itself plugging - even when we did cob mix and purposely set the machine to grind cobs.
tj
Guest
In our area, corn going to feedlots is frequently harvested starting at around 35% moisture. Most cob breakage is from shearing -- split end to end, and not ordinarily a problem in the cage. However, the tapered tip often breaks off separately -- usually carried thru the cage moving sideways. It may be, however, that more distance between the rotor and cage components would allow these tips to upend and be forced into the cage openings. Also more distance may increase the shearing effect off the helical bars. Silks may be another problem -- without pressure holding them against the helicals they may also be snagged in cage openings. Mounting rotor bars at a flatter angle, as I suspect is done on the smaller dia. rotor will probably alleviate some of this. Actually most of this comes from observation of IH machines where the operator has allowed transit vanes to wear down too much,increasing rotor to cage spacing, or concaves are too wide open. Moisture range for this would probably be from about 24% upward.