Discussion
A thresher's concave clearance is set at \( 12 \) mm at the front and \( 6 \) mm at the rear over a \( 300 \) mm wrap. The taper is
Answer: B
Correct answer: 2 mm per 100 mm of wrap
The clearance narrows by 6 mm over 300 mm of wrap:
\[ \frac{12 - 6}{300} = \frac{6}{300} = 0.02\ \mathrm{mm/mm} = 2\ \mathrm{mm\ per\ 100\ mm} \]
The taper is deliberate. The mat enters thick and is progressively compressed as it is carried round, so the gap narrows to keep working it as its bulk falls. A parallel concave would either be too tight at entry or too slack at exit.
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