The Pengaruh Variasi Sudut Kemiringan Pisau terhadap Kapasitas Produksi dan Efisiensi Pemotongan Mesin Pencacah Rumput

Abstract

Forage is the main component in ruminant farming, but manually chopping grass is considered inefficient
in terms of time and effort. This study aims to design and build a grass chopper machine with blade angle
variations of 15°, 30°, and 60°, as well as to find out the effect of each angle on production capacity, the
quality of the chopped grass, and cutting efficiency. The machine is designed using a Honda GX160
gasoline engine with 5.5 hp, an 8:1 ratio pulley transmission system, a frame made of angle iron, and HSS
steel blades, with machine dimensions of 80 cm long, 45 cm wide, and 101.11 cm high. Testing was carried
out by inserting 3 kg of grass material for each blade angle variation. The test results showed that a 60°
blade angle couldn’t be used because it collided with the machine body. A 15° blade angle gave a
production capacity of 72 kg/hour with a cutting efficiency of 63% and uneven chopping quality.
Meanwhile, a 30° blade angle provided the best performance, with the highest production capacity of 90
kg/hour, cutting efficiency reaching 66%, and even chopped quality. Based on these results, it was
concluded that a 30° blade tilt is the most optimal angle to use on a grass chopper machine for producing
good-quality chops more efficiently.