Subtopic: Functional requirements, principles of working, construction and operation of manual, animal, tractor and renewable energy operated equipment for tillage, sowing, planting, fertilizer application, inter-cultivation, spraying, mowing, chaff cutting, harvesting and threshing
Question Statement:
A chaff cutter's electric motor runs at 1440 rpm; speed reduction motor→main shaft = 4:1. Feed rollers (10 cm diameter) are driven by the main shaft with a further reduction of 15:1. The cutting unit (on the main shaft) has two knives. Find the theoretical length of cut chaff (mm). (Rounded to 2 decimal places)
Official Answer Key:
10.40 to 10.60
Step-by-Step Solution & Explanation
Main shaft speed = 1440/4 = 360 rpm. Feed roller speed = 360/15 = 24 rpm; feed (linear) speed = πDN = π×0.10×24 = 7.540 m/min. Knife cuts per minute = main-shaft rpm × number of knives = 360×2 = 720 cuts/min. Length of cut = feed speed/cuts per min = 7.540/720 m = 0.010472 m ≈ 10.47 mm.
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