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All Journal Jurnal Inotera Aptana: jurnal Ilmu dan Humaniora
Dejoi Irfian Situngkir
Politeknik Teknologi Kimia Industri Medan
Religion Humanities Computer Science & IT Education Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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Effect of Cutting Speed on Surface Roughness AS-Scrapper ST37 Using Coated Carbide Tool Fransnazoan Sitorus; Dejoi Irfian Situngkir; A Hafizh Saifullah; Nuzuli Fitriadi
Jurnal Inotera Vol. 9 No. 1 (2024): January-June 2024
Publisher : LPPM Politeknik Aceh Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31572/inotera.Vol9.Iss1.2024.ID321

Abstract

In the lathe machining process, especially surface roughness, are greatly influenced by the cutting angle of the tool, feeding speed, cutting speed and depth of cut. Research purposes is to determine the effect of cutting conditions, namely cutting speed (v) and cutting depth (a) on the level of surface roughness (Ra) on the ST37 As Scrapper material using quantitative research methods that focus on numeric or numbers in a study. The research results obtained a value of Ra ⃗= 6.063 µm at optimum cutting conditions varying a= 1 mm, v= 62 m/min, f= 0.05 mm, tc= 5.29 min.
Tafsir Pancasila: Memaknai Pancasila Menurut Notanogoro Agustin Nurya Savitri; Toba Sastrawan Manik; Dejoi Irfian Situngkir
Aptana: Jurnal Ilmu & humaniora Vol 1 No 2 (2023): Jurnal Aptana: Jurnal Ilmu dan Humaniora
Publisher : CV MEDAN TEKNO SOLUSI

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Abstract

Indonesia secara tegas menyatakan bahwa Pancasila merupakan ideologi dan dasar negara. Hal mengandung konseksuensi logis dan etis bahwa semua permasalahan hendaknya ditafsirkan dan diputuskan sesuai dengan nilai, norma, dan kaidah Pancasila termasuk LGBT.Penelitian ini bertujuan untuk mengkaji cara pemaknaan Pancasila menurut beberapa tokoh khususnya Notanogoro dan dikaitkan dengan Fenomena LGBT. Kajian ini menemukan bahwa perbedaan sudut pandang LGBT di Indonesia lebih disebabkan perbedaan penafsiran atas sila Pancasila. Penelitian ini menggunakan pendekatan kualitatif dengan metode pengumpulan data kajian literatur (library research) dengan menggunakan sumber buku, jurnal, dan sumber lainnya yang relevan. Data diolah melalui empat tahapan yakni pengumpulan data, reduksi data, penyajian dan penarikan kesimpulan Model Habermas dan Miles. Penelitian ini menemukan bahwa Pancasila menurut Notanogoro idealnya ditafsirkan secara hirarki-piramidal. Hal ini juga senada dengan pendapat Kaelan. Penelitian masih sangat terbatas baik dari segi kedalaman kajian dan sumber referensi. Oleh karena itu sangat diperlukan riset dengan pendekatan berbeda dan kajian yang lebih mendalam
Comparison of Annealing and Normalizing Cooling in Ferrous Metal Melting to Make Baffle Plates on Strength and Hardness Values Using the Three-Point Bending Method and Rockwell Hardness Fransnazoan Sitorus; Muhammad Firmansyah; Dejoi Irfian Situngkir; Emil Salim P Siregar; Nuzuli Fitriadi
Jurnal Inotera Vol. 11 No. 1 (2026): January-June 2026
Publisher : LPPM Politeknik Aceh Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31572/inotera.Vol11.Iss1.2026.ID661

Abstract

Metal casting is one of the forming processes widely used in the manufacture of industrial components, including baffle plates installed in babcock and wilcox type boilers, due to its high flexibility and reliability. The study aims to compare the effects of annealing and normalizing heat treatment processes on the strength and hardness of cast metal baffle plates. The annealing process involves heating the material to a certain temperature followed by slow cooling, while the normalizing process uses air cooling at a controlled rate. The hardness of a material must be known, especially for materials undergoing construction during operation, while the flexural strength represents the maximum bending stress that the material can withstand under external loads without deformation. Hardness was measured using the rockwell hardness method, and flexural strength was tested using the three-point bending method. The results showed that the average flexural strength of the annealed specimens was 59 kgf/mm², which was lower than that of the normalized specimens at 66 kgf/mm². In addition, the average hardness of the normalized specimens reached 113.66 HRC, slightly higher than that of the annealed specimens at 108.22 HRC. These findings indicate that the normalizing process increases the flexural strength and hardness more effectively than the annealing process.
Co-Authors A Hafizh Saifullah Agustin Nurya Savitri Emil Salim P Siregar Fitriadi, Nuzuli Muhammad Firmansyah Sitorus, Fransnazoan Toba Sastrawan Manik