Discussion
Consider the following pairs of cylinder type and its dominant action:
Spike-tooth - Impact
Rasp-bar - Rubbing
Wire-loop - Gentle rubbing
Axial-flow - A single pass over the concave
How many of the pairs given above are correctly matched?
Answer: D
Correct answer: Only three
Three pairs are right. A spike-tooth cylinder works by impact, a rasp-bar by rubbing, and a wire-loop by gentle rubbing suited to delicate crops.
The fourth is wrong. An axial-flow cylinder carries the crop in a helical path along the rotor, so the material passes over the concave repeatedly rather than once. That extended working is what gives axial-flow machines their thorough threshing and gentle action, since each pass need do only a little.
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