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All Journal Rotasi Rekayasa Mesin Lisanul Arab: Journal of Arabic Learning and Teaching
Rahman Hakim
Sultan Ageng Tirtayasa University, Banten
Education Languange, Linguistic, Communication & Media Mechanical Engineering

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Analisa Awal Kekasaran Permukaan Hasil Produksi Mesin Cetak Tiga Dimensi Terhadap Pengaruh Variasi Grit Size Sand Paper Hakim, Rahman; Sutisna, Nanang Ali
ROTASI Vol 21, No 3 (2019): VOLUME 21, NOMOR 3, JULI 2019
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (459.136 KB) | DOI: 10.14710/rotasi.21.3.134-139

Abstract

Hasil produksi cetak tiga dimensi tipe FDM (Fused Deposition Modeling) dengan menggunakan material PLA (Polylactid Acid) yang tergolong material polymer pada umumnya mempunyai permukaan yang kasar sehingga memerlukan pekerjaan akhir untuk membuat permukaanya lebih halus lagi. Tujuan percobaan ini ialah untuk mengetahui ukuran Grit Size mana saja yang bisa menghasilkan nilai kekasaran permukaan yang paling rendah atau dengan kata lain mempunyai nilai kehalusan permukaan yang paling tinggi. Salah satu caranya ialah dengan menggunakan kertas gosok dengan variasi tingkat Grit Size yang biasa ditampilkan pada kode angka pada label kertas gosok. Pada percobaan kali ini, kami menggunakan Grit Size dengan ukuran 1000CW, 1200CW dan 1500CW. Parameter uji pada mesin cetak tiga dimensi dengan merek Leapfrog Creatr HS ini menggunakan PLA berdiameter 1.75mm, dengan temperatur Nozzle dan Base Plate sebesar 230oC dan 30oC, serta mempunyai feedrate dan infill density masing-masing sebesar 70%. Setelah dilakukan percobaan sebanyak tiga kali pengambilan data, kami dapatkan hasil yang dimana dengan menggunakan sand paper dengan grit size 1500CW mempunyai nilai kekasaran permukaan (Ra) yang paling rendah, yaitu sebesar 4,392 μm (N8).
Project-Based Learning for the Design of Progressive Dies Supporting Tools Hakim, Rahman; Widiastuti, Hanifah; Wijayanti, Ita; Muvariz, Mufti Fathonah; Silaban, Andre Kevil
Jurnal Rekayasa Mesin Vol 12, No 1 (2021)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/10.21776/ub.jrm.2021.012.01.13

Abstract

In the oil and gas industry, manufacturing processes covered a variety of fields including pipe fittings production. Generally, this process involves a press machine utilized as a shape forming using punch-dies sets as mold profiles. The common problem found with the dies is the dimension of dies is not ergonomics to be handled manually by operators. Additionally, the support of dies tends to experience buckling upon receiving a pressure load of 15 MPa. Hence, alternative and practical designs are required, which have low deflection values and high fatigue resistance rates. Additionally, the designs are expected to be safe and economical. In this study, two alternative designs of punch-dies support are proposed. Subsequently, the FEA simulation was carried out for pipe fittings of 8 inches with ASME B16.9 standard size for WF Beam A36 Steel to compare the two proposed designs. The results show that alternative design 2 has a lower deflection value of 0.181 mm, a higher Factor of Safety of 3.21, and a higher cycle time of 358569 cycles than alternative design 1. Nevertheless, alternative design 2 has a higher production cost of 220 USD compared to alternative design 2. Therefore, this study shows that alternative design 2 has better performance while alternative design 1 is more economical.
Pengembangan Alat Bantu Arbor untuk Pembuatan Roda Gigi pada Mesin Frais Vertikal Widodo, Widodo; Hakim, Rahman
Jurnal Rekayasa Mesin Vol 12, No 2 (2021)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2021.012.02.6

Abstract

The machining process is included in the classification of metal cutting processes, which are used to change the shape of metal or non-metallic product by cutting, peeling or separating. One of the machines used in this cutting process is a vertical type milling machine. This machine functions to make a product, one of which was a gear. The supporting equipment needed to make this gear was a vertical arbor tool. The material used in the manufacture of this product was a cast carbon steel type using the design method for manufacturing and assembly (DFMA), which began by examining and identifying needs, conceptualizing and designing products and making these products tailored to the dimensional specifications of standard and common cutter modules in the market.  The results of the manufacture of this tool were directly tested for the manufacture of gears of various sizes and produced products whose deviations were within the tolerance of the measuring instrument, namely in the range 0 to 2%. In addition, the von Mises stress simulation at an engine speed of 150 Rpm, 450 Rpm and 750 Rpm and the resulting maximum stress was still below the yield limit, so it was safe to use.
الأخطاء الشائعة في مهارة الكلام لدى الطلبة الجدد بجامعة كياهي الحاج عبد الحليم موجوكرتو Azimah, Nahdliyyatul; Hakim, Rahman; Su'ada, Fatkhiyatus
Lisanul Arab: Journal of Arabic Learning and Teaching Vol 10 No 2 (2021): Lisanul Arab
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/la.v10i2.51933

Abstract

This study aims to describe the common mistakes that occur in new students majoring in Arabic on the practice of speaking skills. This type of research is qualitative through a descriptive approach. Collecting data through the method of speaking, listening, and observing. The results of this study indicate that the forms of language errors that often occur are in 1) phonology, 2) morphology, and 3) syntactic. In the phonological aspect, there are replacements in the pronunciation of hijaiyah letters, additions in pronunciation, and omissions. In the morphological aspect, errors were found in the use of auzānul fi'il, tastniyah, and jama' muannast salim. In the syntactic aspect, errors were found in the use of dhamāir munfasilah and muttashilah, jar majrūr, tarkīb na'ti, tarkīb 'adadi, jumlah fi'liyah, and jumlah ismiyah. To face these previous problems, the teacher provided the treatments on the following forms: (1) Presenting the pronunciation of Arabic letters and the pronunciation of the vocabulary intact. (2) Introduce short expressions. (3) Presenting sentence patterns. (4) Providing short dialogues, and certainly all of these qualities are applied to these students gradually and continuously in the class in the form of two-by-two. In addition, all these treatments were presented by the teacher through podcasts and YouTube, the crazy method, the rhetorical method, and the problem-solving method
Co-Authors Azimah, Nahdliyyatul Muvariz, Mufti Fathonah Silaban, Andre Kevil Su'ada, Fatkhiyatus Sutisna, Nanang Ali Widiastuti, Hanifah Widodo Widodo Wijayanti, Ita