Discussion
The curved grate beneath a threshing cylinder, through which detached grain falls, is the _____.
Answer: D
Correct answer: concave
The concave is the curved perforated grate wrapping beneath the cylinder. The crop is worked in the gap between the two, detached grain falls through the openings, and the straw is carried on to the walkers.
Its clearance is one of the two principal adjustments on the machine. A chaffer is a sieve in the cleaning shoe, a walker shakes grain out of the straw further downstream, and the rotor is the cylinder itself in an axial-flow machine.
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