Discussion
Arrange the four threshing actions in the order they typically act on a crop mat entering a spike-tooth cylinder:
1. Impact of the teeth on the incoming material
2. Rubbing between the mat and the concave
3. Stripping of remaining grain as the mat is carried round
4. Centrifugal throw of grain through the concave openings
Select the correct sequence.
Answer: C
Correct answer: 1, 2, 3, 4
The actions follow the mat's passage round the cylinder. The teeth strike the incoming material first (1), which is the spike-tooth's dominant action and begins the detachment.
The mat is then rubbed between cylinder and concave (2) as it is carried round, remaining grain is stripped from the heads as it continues (3), and the freed grain is thrown centrifugally through the concave openings (4). All four contribute, which is why a spike-tooth cylinder threshes so thoroughly and damages so much.
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