Discussion
Consider the following pairs of adjustment and its usual effect:
Higher cylinder speed - More threshing and more damage
Tighter concave - More threshing and more damage
Higher fan speed - Cleaner sample and more blown loss
Higher feed rate - Lower losses and better cleaning
How many of the pairs given above are correctly matched?
Answer: B
Correct answer: Only three
Three pairs are right. A higher cylinder speed gives more threshing and more damage, a tighter concave does the same, and a higher fan speed gives a cleaner sample at the cost of more grain blown away.
The fourth is wrong on both counts. A higher feed rate thickens the mat, so grain cannot reach the concave or shake free of the straw: losses rise and cleaning gets worse. Pushing a thresher for throughput reduces the grain actually recovered.
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