Posted by moresmoke on October 24, 2023 at 06:04:15 from (66.231.112.235):
In Reply to: Combine operation posted by sourgum on October 23, 2023 at 12:09:48:
As others have stated, cylinder/walker combines are less particular about running at less than capacity. You can adjust them to do a decent job fairly easily.
Combines that use rotary separation need a certain amount of material in them to separate the grain effectively. If there is not enough material in the rotor, the crop mat just slides round and round until it goes out the back with the grain still in it. On most rotary combine designs the threshing and separating is done with the same cylinder so you have to balance the effectiveness and capacity of both. And sometimes the adjustments you need are opposite of each other.
Once the grain is separated we move onto the sieves for cleaning. I need a nice even mat of material across the sieve fo it to clean effectively. If I dont have enough material I end up with areas of the sieve that are covered and areas that are not. The areas that are not covered get too much airflow and some grain is blown out the back. The areas that have a deeper mat of material dont get enough airflow and result in a dirty sample and some grain being carried over the back.
As some of the other comments have mentioned, efficiency is also key. Todays largest combines cost over $500/hr to run. Gets expensive to dilly dally along.
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