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All Journal Turbo : Jurnal Program Studi Teknik Mesin Jurnal Pendidikan Teknik Mesin
Sealtial Mau
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PENGARUH PARAMETER PEMOTONGAN TERHADAP KEKASARAN PERMUKAAN BAJA KARBON RENDAH PADA PROSES BUBUT KONVENSIONAL Fahrizal; Priyono; Sealtial Mau; Anastasia De Delia Dos Santos
Jurnal Pendidikan Teknik Mesin Vol. 9 No. 1 (2022): Jurnal Pendidikan Teknik Mesin
Publisher : Program Studi Pendidikan Teknik Mesin Fakultas Keguruan dan Ilmu Pendidikan Universitas Sriwiajaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jptm.v9i1.17256

Abstract

Dalam proses bubut, kualitas permukaan benda kerja dipengaruhi oleh parameter pemotongan seperti kecepatan potong, kedalaman potong, laju pemotongan, dan sebagainya. Namun demikian belum banyak informasi tentang keterkaitan atau interaksi antara parameter pemotongan terhadap nilai kekasaran permukaan. Penelitian ini bertujuan untuk mengkaji pengaruh parameter pemotongan terhadap nilai kekasaran permukaan baja karbon rendah. Penelitian ini dilakukan secara eksperimental menggunakan mesin bubut konvensional dengan pahat bubut HSS Cobalt 5% pada pemotongan baja konstruksi St 40 tanpa menggunakan cairan pendingin (dry machining). Diperoleh kesimpulan bahwa jumlah putaran mesin, kedalaman potong dan laju pemotongan memiliki pengaruh yang signifikan terhadap tingkat kekasaran permukaan. Nilai kekasaran permukaan paling rendah diperoleh pada jumlah putaran 280 rpm, kedalaman potong 0,5 mm dan laju 0,2 mm/putaran dengan nilai kekasaran sebesar 2,968 µm. Kontribusi masing-masing parameter terhadap nilai kekasaran permukaan baja St 40 adalah putaran mesin sebesar 42,2%, kedalaman potong sebesar 10% dan laju pemakanan memberikan kontribusi sebesar 20,3%.
Uji kinerja mesin pemecah kulit kemiri tipe impact rotary Fahrizal Fahrizal; Sealtial Mau; Damianus Manesi; Tri Mandala Putra
TURBO [Tulisan Riset Berbasis Online] Vol 15 No 1 (2026): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v15i1.5011

Abstract

An impact rotary–type candlenut shelling machine utilizes centrifugal force to strike candlenuts that fall by gravity, projecting them outward to collide with the chamber wall. This method is expected to provide higher shelling efficiency than existing techniques. This study aimed to examine the effect of blades rotational speed on shelling efficiency. An experimental approach with a randomized design was employed, using rotational speed as a single factor with four levels: 850, 980, 1140, and 1300 rpm. Candlenuts were obtained from farmers in Amarasi District, Kupang Regency. The candlenuts were dried in the sun for 5 days before testing. Data collection was carried out by testing a shelling machine according to the experimental design. The results of the study found that the higher the rotation speed of the blades, the higher of capacity. Shelling efficiency was evaluated by measuring the weight of shelled candlenuts from each treatment. The results of the study found that the higher the rotation speed, the higher the capacity. However, the highest shelling efficiency was achieved at 850 rpm, the lowest effective speed. At this speed, the output consisted of 33.03% whole kernels, 30.33% semi-broken kernels, 15.9% crushed kernels, and 20.74% kernels with adhering shell fragments.
Co-Authors Anastasia De Delia Dos Santos Damianus Manesi Fahrizal Fahrizal Priyono Tri Mandala Putra