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 power chaff cutter has a flywheel with 2 radial cutting knives rotating at $360\text{ rpm}$. The fodder feed rollers feed the crop at a linear speed of $0.30\text{ m/s}$. Calculate the theoretical length of cut of the chopped fodder in $\text{mm}$.
Answer Key:
25
Step-by-Step Solution & Explanation
Given:
- Number of knives on flywheel $n = 2$
- Speed of flywheel $N = 360\text{ rpm} = \frac{360}{60} = 6\text{ rev/s}$
- Total cuts per second $= n \times \frac{N}{60} = 2 \times 6 = 12\text{ cuts/s}$
- Feed velocity $v = 0.30\text{ m/s} = 300\text{ mm/s}$
Theoretical length of cut ($L_c$):
$L_c = \frac{v}{\text{cuts/s}} = \frac{300\text{ mm/s}}{12\text{ cuts/s}} = 25.0\text{ mm}$