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All Journal Otopro Journal of Applied Smart Electrical Network and System (JASENS) Logic : Jurnal Rancang Bangun Dan Teknologi Jurnal Masyarakat Madani Indonesia Vokasi UNESA Bulletin of Engineering, Technology and Applied Science
Talifatim Machfuroh
Politeknik Negeri Malang
Humanities Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Public Health Social Sciences Transportation

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PENGARUH VARIASI TRAVEL SPEED TERHADAP KEKUATAN TARIK PADA PENGELASAN DISIMILAR METAL DENGAN MIG ROBOTIC WELDING Kris Witono; Talifatim Machfuroh; Sarjiyana Sarjiyana; Elka Faizal
Otopro Vol 19 No 1 Nov 2023
Publisher : Jurusan Teknik Mesin Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/otopro.v19n1.p34-39

Abstract

Welding using dissimilar metals is a new phenomenon in the industrial world. Some studies have already addressed dissimilar metal welding, but they are limited to variations in welding current strength and voltage. None have yet explored welding travel speed, mainly due to the difficulty in controlling it in manual welding. Because of this background, the researcher conducted a study on welding by varying the travel speed. The aim of this research is to elucidate the influence of travel speed on tensile strength in dissimilar metal welding using MIG robotic welding. The study involved joining dissimilar metals, namely low carbon steel and stainless steel (SS 304), using the MIG Robotic Welding process with travel speed variations of 50 cm/second, 60 cm/second, and 70 cm/second. The welding results were then subjected to tensile testing and macrostructure observation of the fracture surfaces. The research findings indicate that the highest tensile strength was achieved at a travel speed of 50 cm/minute, with a maximum tensile strength of 839.8879 MPa.
Influence of MIG Welding Process Parameters on the Strength of Bimetal Joints: Study of Gas Flow Rate and Macrofractures Talifatim Machfuroh; Kris Witono; Septyana Riskitasari; Etik Puspitasari
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 24 No. 3 (2024): November
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v24i3.141-149

Abstract

Bimetal joints are often used in various industries, such as automotive, power generation, electronics, and manufacturing. This is because bimetal joints allow the joining of two types of metal with different properties. Welding two different types of metal can pose its own challenges, such as the difficulty of controlling welding parameters so that the results are optimal for both types of metal, as well as differences in the thermal and mechanical properties of the two metals. This has led to extensive research on bimetal plate connections. Based on this background, this research aims to determine the effect of variations in flow rate and current strength on the tensile strength of robotic welding bimetal welded joints, as well as determine the results of macro photos of fractures resulting from tensile tests for each variation. The research was carried out experimentally where each variation was repeated with data 3 times. Based on the results and discussion, it is known that the optimal gas flow rate in general is 20 l/min, where the tensile strength reaches 353.1442 MPa–455.5458 MPa. At this flow rate, the dominant fracture occurs in the base metal and is ductile, which indicates good plastic deformation. On the other hand, gas flow that is too low or too high causes joint defects and reduces the tensile strength. Meanwhile, other welding parameters, namely variations in welding current, affect tensile strength. At a gas flow of 10 l/min, increasing the current to 180 A produces the highest tensile strength of 449.4357 MPa with ductile fracture characteristics. However, at a current of 120 A there is a significant decrease due to overheating, especially at higher gas flows such as 20 l/min and 30 l/min, which results in brittle fracture in the heat-affected zone (HAZ). The results of this research contribute to the understanding of the influence of welding parameters on the tensile strength and fracture characteristics of bimetallic joints. This research can be a reference for the development of more efficient and reliable welding processes in various industries, such as automotive, power generation and manufacturing, which require bimetallic joints with optimal quality.
Optimization of CNC Milling Parameters Machining on Surface Roughness and Hardness Value of Material SS 316 Muhammad Wildan Syifatillah; Talifatim Machfuroh
Vokasi UNESA Bulletin of Engineering, Technology and Applied Science Vol. 3 No. 1 (2026)
Publisher : Universitas Negeri Surabaya or The State University of Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/vubeta.v3i1.40971

Abstract

CNC milling of stainless steel (SS) 316 faces considerable difficulties in obtaining the desired hardness and surface quality as a result of machining variability. This investigation focuses on the optimization of spindle speed, feed rate, and depth of cut using the Taguchi method, where soluble oil served as the cutting fluid. The Taguchi method was used with an L9 orthogonal array was implemented to design the experimental trials and the responses of surface roughness (Ra) and hardness (HRB) were quantified according to ISOstandards. The findings reveal that the minimum surface roughness is obtained at a spindle speed of 2100 rpm, feed rate of 50 mm/min, and depth of cut of 0.2 mm and the maximum hardness is achieved at 1500 rpm, 50mm/min, and 0.2 mm. Generally, higher feed rates and depths of cut contribute to poorer surface finish, whereas elevated spindle speeds are associated with improved surface quality. The observed reduction in hardness is primarily linked to thermal accumulation in the cutting zone, which is partlyalleviated by the use of soluble oil. These findings emphasize the need to consider distinct optimal conditions for surface roughness and hardness must be considered to ensure superior CNC milling outcomes for SS 316 stainless steel.
On-Board Diagnostic Tool menggunakan Mikrokontroler pada Kendaraan Listrik (EV) Terintegrasi dengan Speedometer Zakiyah Amalia; Achsanul Khabib; Talifatim Machfuroh; Fica Aida Nadhifatul Aini; Diama Rizky Septiawan; Siti Duratun Nasiqiati Rosady; Ahsani Maulidina
Journal of Applied Smart Electrical Network and Systems Vol. 7 No. 1 (2026): JASENS Vol. 7 No. 1 (2026) : Vol. 07 No. 01, Juni 2026
Publisher : Indonesian Society of Applied Science (ISAS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52158/zgs4tv61

Abstract

Electric vehicles (EVs) are becoming a growing environmentally friendly transportation solution, but they still require an efficient and easily accessible vehicle condition monitoring system. Electric motorcycle users often experience difficulties in directly knowing the condition of the battery, motor, and drive system. Based on these problems, this study aims to develop an On-Board Diagnostic (OBD) system integrated with a speedometer to monitor the main parameters of two-wheeled electric vehicles in real-time. The research method includes designing a microcontroller-based system connected to a motor controller via UART and Controller Area Network (CAN) communication. The system is equipped with a DS3231 RTC module for time markers, an SD Card for data storage, and a 20x4 LCD to display voltage, current, power, temperature, and fault status (fault code). Testing was conducted on the Graha Merjosari Asri–Greenland at Tidar, Malang route, with speed variations between 0–45 km/h. The results show that the system is capable of detecting undervoltage conditions below 60 V, maintaining a stable maximum temperature of 41°C without overheating, and displaying vehicle data accurately and responsively. The developed OBD-speedometer system functions effectively as a portable and economical diagnostic tool for electric two-wheeled vehicles, with potential for development into an IoT-based intelligent monitoring system.
Papan Alur Digital Sebagai Edukasi Keselamatan Penggunaan Peralatan pada Aktivitas Tubing Nicky Suwandhy Widhi Supriyanto; Septyana Riskitasari; Rilis Eka Perkasa; Silvia Rahmi Ekasari; Talifatim Machfuroh; Nurlia Pramita Sari; Wahyu Aulia Nurwicaksana
Jurnal Masyarakat Madani Indonesia Vol. 5 No. 1 (2026): Februari
Publisher : Alesha Media Digital

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59025/wdjxc198

Abstract

Banyumaro River Tubing menghadapi permasalahan operasional berupa tingginya beban kerja guide wisata akibat penyampaian briefing keselamatan secara verbal dan berulang kepada sekitar 50–60 pengunjung setiap akhir pekan. Kondisi ini berpotensi menurunkan konsistensi penyampaian informasi keselamatan dan meningkatkan risiko kesalahan penggunaan peralatan. Kegiatan pengabdian kepada masyarakat ini bertujuan merancang dan menerapkan papan alur digital sebagai media edukasi keselamatan sebelum aktivitas tubing guna mengurangi beban kerja guide serta meningkatkan pemahaman pengunjung. Metode pelaksanaan menggunakan pendekatan pemberdayaan berbasis aset komunitas melalui tahapan observasi, perancangan partisipatif, pembuatan alat, dan uji coba lapangan. Papan alur digital dirancang menyajikan informasi keselamatan secara visual dan audio yang tersusun berurutan sesuai prosedur penggunaan peralatan. Hasil evaluasi menunjukkan adanya penurunan frekuensi briefing verbal oleh guide dari sebelumnya dilakukan berulang kali menjadi hanya penegasan tambahan, serta peningkatan kesiapan dan kepatuhan pengunjung dalam mengikuti prosedur keselamatan sebelum pengarungan. Dengan demikian, papan alur digital terbukti menjadi media edukasi keselamatan yang lebih konsisten dan efektif dibanding metode konvensional, serta berpotensi mendukung pengelolaan wisata sungai yang aman dan berkelanjutan berbasis komunitas
Evaluation of Lathe Operating Conditions Based on ISO 10816 Using the Correlation Between Spindle Vibration and Surface Quality Talifatim Machfuroh; Zakiyah Amalia; Siti Duratun Nasiqiati Rosady; Nurlia Pramita Sari; Agus Hardjito; Subagiyo
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 26 No. 2 (2026): July
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v26i2.pp. 95-177

Abstract

The evaluation of machine tool operating conditions is commonly performed based on mechanical reliability, while its direct relationship with the quality of machined surfaces is still rarely quantified. This study aims to evaluate the operating condition of a conventional lathe based on ISO 10816 by analyzing the correlation between spindle vibration and surface roughness. Experiments were conducted on a Dixon CQ6236X1000 lathe with variations in feed rate (0.104–0.835 mm/rev) and depth of cut (0–1.5 mm) at a constant spindle speed of 460 rpm. Spindle vibration was measured in terms of root mean square (RMS) velocity (mm/s) in the vertical and horizontal directions, and frequency-domain analysis was performed using Fast Fourier Transform (FFT). Surface roughness was evaluated using Ra, Rq, and Rz parameters. The results show that the RMS vibration values range from 0.4 to 2.5 mm/s, which correspond to Zone B and Zone C of ISO 10816-3 class I. At Zone B, the surface roughness values are relatively low (Ra = 2–6 µm), indicating stable machining conditions. However, when the operating condition shifts to Zone C, the surface roughness increases significantly, with Ra values exceeding 10 µm under certain cutting conditions. The correlation analysis between RMS vibration and surface roughness yields a coefficient of determination of R² = 0.399, indicating a moderate positive relationship. FFT analysis reveals that the dominant vibration components are associated with spindle rotational frequency and its harmonics, indicating the presence of mild regenerative chatter without evidence of bearing defects.These findings demonstrate that ISO 10816 can be utilized not only as a mechanical acceptability standard but also as a predictive indicator of surface quality in turning operations. The results provide a useful reference for integrating vibration-based condition monitoring with machining quality control in both industrial and educational workshop environments.
Co-Authors Achsanul Khabib Agus Hardjito Ahsani Maulidina Diama Rizky Septiawan Elka Faizal Etik Puspitasari Fica Aida Nadhifatul Aini Kris Witono Muhammad Wildan Syifatillah Nicky Suwandhy Widhi Supriyanto Nurlia Pramita Sari Nurlia Pramita Sari Rilis Eka Perkasa Sarjiyana SEPTYANA RISKITASARI Silvia Rahmi Ekasari Siti Duratun Nasiqiati Rosady Siti Duratun Nasiqiati Rosady Subagiyo WAHYU AULIA NURWICAKSANA Zakiyah Amalia Zakiyah Amalia