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All Journal Journal of Mechanical Science and Engineering AUSTENIT PETRA : Jurnal Teknologi Pendingin dan Tata Udara Jurnal Inovator JURNAL CRANKSHAFT MACHINERY: Jurnal Teknologi Terapan
Dodi Tafrant
Politeknik Negeri Sriwjaya
Automotive Engineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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ANALISA PENGARUH KEMIRINGAN SUDUT SCREW EXTRUDER PADA PROSES PEMBUATAN FILAMENT 3D PRINTER PADA MESIN EKSTRUSI SINGLE SCREW Muhammad Rasid Rasid; Suparjo Suparjo; Dodi Tafrant; Ozkar F. Homzah; Syamsul Ma’arif
AUSTENIT Vol. 14 No. 1 (2022): AUSTENIT: April 2022
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/austenit.v14i1.4445

Abstract

The purpose of this research is to calculate the effect of the screw extruder angle on the results of 3-dimensional printer filaments that are printed using a single screw extrusion machine. The machine parameters used in this study were: pull speed 16 rpm, extrusion speed 28 rpm, extrusion mold diameter of 2 mm, and temperature of 180oC. The material used is recycled HDPE plastic. While the tilt angle of the screw in the research conducted by providing 5 variants of the angle of inclination (0o, 10o, 15o, 20o, 25o) where the diameter of the screw shaft used is the same. Data analysis was carried out using a simple linear regression method. Where the results obtained were: 1) the smallest filament diameter was 0.9 mm when using a screw with an angle of 0o, and 2) the highest diameter was 1.86 mm when using a screw with an angle of 25º. The conclusion obtained is that the tilt angle of the helical screw affects the results of recycled HDPE plastic extrusions, where the effect of the screw angle tilt is directly proportional to the filament diameter. In other words, with the addition of the tilt angle of the screw, the diameter of the resulting filament will also increase. In addition, based on the results of measuring the diameter of the filament, the conclusion that can be drawn is that with the increase in the diameter of the extrusion result, the outflow obtained will also be greater.
The Effect of Fluid Flow Current to 30º Blades Achard Turbine Performance Muhammad Faizal; Dodi Tafrant
Journal of Mechanical Science and Engineering Vol 3, No 1 (2016): Journal of Mechanical Science and Engineering
Publisher : Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (184.376 KB)

Abstract

Achard turbine is one kind of vertical axis water turbine that can use to low head water current. Achard turbine can use to river flow or irrigation canal. This is will make an additional function of river and irrigation canal to be a renewable energy resource. The experiment use three blades NACA 0020 Achard turbine in the irrigation canal at Belitang District, West Ogan Komering Ulu. The flow current is 0.55 m/s, 0.61 m/s, and 0.71 m/s. The result shows increasing of CP and CT by increasing of flow current. Maximum CP is 0.1797 at flow current 0.71 m/s. Maximum CT is 0.206 at flow current 0.71 m/s.
PENGARUH SUDUT KEMIRINGAN SUDU TERHADAP KINERJA TURBIN ACHARD YANG DIGABUNG DENGAN DEFLEKTOR 30° Dodi Tafrant Tafrant; Hendradinata Hendradinata Hendradinata
PETRA : Jurnal Teknologi Pendingin dan Tata Udara Vol 6 No 1 (2019): JURNAL PETRA
Publisher : Politeknik Sekayu

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (336.721 KB)

Abstract

Turbin Achard adalah salah satu tipe turbin aliran lintang bersumbu tegak yang bisa digunakan di alirandengan head rendah. Karena itu, turbin tipe ini bisa digunakan di aliran irigasi atau sungai tanpa harusmembendungnya terlebih dahulu. Hal ini memberikan keuntungan dari segi biaya yang harus dikeluarkan,maupun dari segi ekologi yang tidak merusak alam selain juga akan memberikan fungsi lain kepada aliranirigasi kanal terbuka menjadi sumber energi terbarukan. Penelitian ini dilakukan dengan menggunakan tiga suduturbin Achard NACA 0020 di aliran irigasi kanal terbuka yang terletak di Kabupaten OKU Timur PropinsiSumatera Selatan. Aliran yang dipakai mempunyai kecepatan 0,55 m/s, 0,61 m/s, dan 0,71 m/s. Penelitian inimendapatkan hasil bahwa penambaan sudut kemiringan sudu pada turbin Achard memberikan penambahanpada efisiensi, namun memberikan pengurangan pada koefisien torsi.Kata Kunci: Turbin Achard, Efisiensi Turbin, Koefisien Torsi
KEKERASAN DAN STRUKTUR MIKRO BAJA AISI 1040 SEBAGAI HASIL PROSES QUENCHING MENGGUNAKAN PENDINGIN AIR GARAM DAN ASAP CAIR Dodi Tafrant; Mulyadi Mulyadi; Hendradinata Hendradinata; Rachmat Dwi Sampurno; Almadora A. Sani; Karmin Karmin; Randy Hidayat; M. Agil Muzafar; Devita Dinda Fitriani
MACHINERY: Jurnal Teknologi Terapan Vol. 3 No. 2 (2022): Machinery: Jurnal Teknologi Terapan
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.6857629

Abstract

Steel with various uses has an important role in machining and construction processes. In its use, steel is chosen because of its strength, ductility, and hardness. One type of steel commonly used in the machining process is AISI 1040 steel. This is because AISI 1040 steel has tough, strong, and hard properties. However, in its use sometimes AISI 1040 steel must be hardened to be more capable in its use. In that endeavor, AISI 1040 steel can be subjected to heat treatment to change its microstructure from initially Ferrite and Pearlite, to Martensite. This change in microstructure has an effect on increasing the hardness value of AISI 1040 steel. This study was conducted to determine how much effect the increase in hardness value would have if AISI 1040 steel was subjected quenching using brine and liquid smoke as cooling media. The results obtained were an increase in the hardness value of AISI 1040 steel to 63.76 HRc, and 65.40 HRc for each cooling medium. The visible microstructure is the formation of a martensitic phase on AISI 1040 steel after heat treatment.
PENGARUH VARIASI MATERIAL MATA PAHAT ENDMILL TERHADAP KEKASARAN PERMUKAAN RESIN PADA CNC ROUTER 3018 Muhammad Andhika; Iskandar Ismail; Almadora Anwar Sani; Dodi Tafrant
MACHINERY: Jurnal Teknologi Terapan Vol. 4 No. 2 (2023): Machinery: Jurnal Teknologi Terapan
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.8049203

Abstract

The purpose of this study is to find out what chisel is the best for cutting acrylic resin and evaluate which one is the best, which can be seen from the surface roughness value obtained through the cutting process. The workpiece materials used in this study are acrylic resins and various types of chisels, namely HSS, carbide and tungsten, Because the chisel has different characteristic properties, so it can be used as a comparison. For the next process, the workpiece is fed three times with a spindle kec of 1000 rpm and a cut kec of 400 mm / minute and a feeding depth of 0.5 mm. It can be concluded that the surface roughness data of the workpiece, the value of the surface roughness of the workpiece of acrylic resin is averaged from the smoothest to the roughest, namely HSS, tungsten chisel, and the roughest carbide. The average roughness value of the HSS chisel is 0.751 μm and the average roughness value of the tungsten chisel is 1.578 μm and the roughness value of the carbide chisel is 1.768 μm.
Analisis Pengaruh Persentase Campuran Resin dan Katalis Terhadap Ketahanan Korosi Pada Pelapisan Material Poros ST 37 Dodi Tafrant; Muhammad Rasid; Alimedi Alimedi; Safei Safei; Rachmat Dwi Sampurno
Jurnal INOVATOR Vol. 7 No. 1 (2024)
Publisher : LPPM Politeknik Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37338/inovator.v7i1.291

Abstract

Secara umum, resin memiliki kegunaan sebagai agen perekat untuk material-material tertentu. Resin sendiri merupakan suatu campuran likuid yang terdiri dari beragam senyawa kompleks seperti alkohol, asam resinat, dan ester resnotannol. Menurut Kuspradini (2016), resin dapat ditemukan secara alami maupun dibuat secara sintetis, dan memiliki sifat-sifat seperti padat, transparan dengan sedikit kekeruhan, berkilauan, mudah terbakar, dan cenderung meleleh saat terpapar panas. Penggunaan resin sering kali digunakan untuk mengatasi proses korosi pada logam dengan menerapkan metode pelapisan. Proses pengeringan resin, terutama dalam campuran dengan katalis, memengaruhi waktu pengerasan dan kemampuan perekat resin pada material logam yang diuji. Penelitian ini bertujuan untuk mengurangi korosi pada material poros dengan menggunakan campuran resin dan katalis dengan perbandingan 1:15 dan 1:20. Proses pengujian korosi dilakukan dengan merendam spesimen uji dalam larutan air garam 3,5% selama 40 hari. Berat spesimen uji sebelum dan sesudah proses korosi akan diukur menggunakan timbangan digital. Hasil penelitian menunjukkan bahwa campuran resin dan katalis dengan perbandingan 1:15 menghasilkan tingkat laju korosi yang lebih rendah daripada bahan mentah (row material) dan campuran resin dan katalis dengan perbandingan 1:20. Terjadi penurunan laju korosi sebesar 0,9114 x 10^-6 gr/menit pada campuran dengan perbandingan 1:15, sementara pada campuran resin 1:20, terdapat kecenderungan peningkatan laju korosi.
PENGARUH VARIASI TEKANAN DAN PENAMBAHAN UNSUR MAGNESIUM TERHADAP PENGECORAN ALUMINIUM PADA KOPLING PERAHU MOTOR Harahap, Muhammad Rizki; Rizky Brillian Yuliandi; Taufikurahman; Ella Sundari; Dodi Tafrant
MACHINERY Jurnal Teknologi Terapan Vol. 5 No. 2 (2024): Machinery: Jurnal Teknologi Terapan
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.12736345

Abstract

The universal joint coupling or U-joint is the part of the motor boat that connects the engine to the propeller shaft. The U-joint of a motor boat made of aluminum often suffers damage such as breaking due to loads when operating. The purpose of this research is to improve the quality of this product with the squeeze casting method with the addition of magnesium 3% and 4% and pressure variations of 70, 85 and 100 MPa for casting universal joint coupling products. The casting process is carried out by melting aluminum and mixing it with magnesium and then pressing it using a hydraulic pressure tool. After the casting process is complete, the specimen is trimmed for hardness testing. The results of the hardness test obtained the highest value on the pressure parameter of 100 MPa. For 4% Al-Mg with an emphasis of 100 MPa, the average hardness value was 94.66 BHN. For Al-Mg 3% with an emphasis of 100 MPa, the average value was 90.06 BHN. While the raw material has a hardness value of 57.52. It can be seen that the hardness value has increased from before. It can be concluded that the squeeze casting casting method and the addition of magnesium can affect the hardness value of aluminum.
Analisis Kegagalan Pipa Elbow Superheater 90° Terhadap Perlakuan Bending Menggunakan Hydraulic Pipa Bender Sampurno, Rachmat Dwi; Tafrant, Dodi; Putri, Fenoria; Hendradinata, Hendradinata; Arnoldi, Dwi; Ramadhan, Surya
JURNAL CRANKSHAFT Vol 8, No 2 (2025): Jurnal Crankshaft Vol. 8 No. 2 (2025)
Publisher : Universitas Muria Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24176/cra.v8i2.15058

Abstract

Steam power plants are the most widely used power plants. The steam produced will be channeled using a superheater pipe. The component that often fails is the superheater elbow pipe. The method used is purposive sampling. The test method used is metallographic testing where the test is based on ASTM. For the results of reading the microstructure content, the percentage of the microstructure phase of the sample tested was factory factory elbow superheater pipe with a percentage of 53.50% pearlite and 27.50% ferrite, the flexible superheater elbow pipe sample contained 43.00% pearlite and 36% ferrite. . 00%, the leaking superheater elbow pipe sample contained 37.50% pearlite and 43.00% ferrite. So the conclusion is that the superheater elbow pipe which has high hardness and good pearlite and ferrite content is found in the factory ebow superheater pipe sample, the manual bending elbow superheater pipe experienced a reduction in the pearlite phase and the addition of a ferrite phase, so it can be concluded that this sample experienced a reduction in resistance and hardness, The Leaking superheater elbow pipe sample has high hardness due to the heat treatment process and a martensite phase appears due to heating, while the percentage of pearlite decreases and ferrite increases, and if there is more ferrite in the material, the pressure in the pipe will be decreased.Steam power plants are the most widely used power plants. The steam produced will be channeled using a superheater pipe. The component that often fails is the superheater elbow pipe. The method used is purposive sampling. The test method used is metallographic testing where the test is based on ASTM. For the results of reading the microstructure content, the percentage of the microstructure phase of the sample tested was factory factory elbow superheater pipe with a percentage of 53.50% pearlite and 27.50% ferrite, the flexible superheater elbow pipe sample contained 43.00% pearlite and 36% ferrite. . 00%, the leaking superheater elbow pipe sample contained 37.50% pearlite and 43.00% ferrite. So the conclusion is that the superheater elbow pipe which has high hardness and good pearlite and ferrite content is found in the factory ebow superheater pipe sample, the manual bending elbow superheater pipe experienced a reduction in the pearlite phase and the addition of a ferrite phase, so it can be concluded that this sample experienced a reduction in resistance and hardness, The Leaking superheater elbow pipe sample has high hardness due to the heat treatment process and a martensite phase appears due to heating, while the percentage of pearlite decreases and ferrite increases, and if there is more ferrite in the material, the pressure in the pipe will be decreased.
Co-Authors Ali Medi Almadora A. Sani Almadora Anwar Sani Arnoldi, Dwi Devita Dinda Fitriani Ella Sundari Harahap, Muhammad Rizki Hendradinata, Hendradinata Homzah, Ozkar F Iskandar Ismail Karmin Karmin M. Agil Muzafar Muhammad Andhika Muhammad Faizal Muhammad Rasid Muhammad Rasid Rasid Mulyadi Mulyadi Putri, Fenoria Rachmat Dwi Sampurno Rachmat Dwi Sampurno Ramadhan, Surya Randy Hidayat Rizky Brillian Yuliandi Safei Safei Sampurno, Rachmat Dwi Suparjo Suparjo Syamsul Ma’arif Taufikurahman