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All Journal Rekayasa Mesin LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Prosiding Semnastek ROTOR: JURNAL ILMIAH TEKNIK MESIN Jurnal Rekayasa Mesin Jurnal Akta JTT (Jurnal Teknologi Terpadu) Machine : Jurnal Teknik Mesin Manutech : Jurnal Teknologi Manufaktur Sprocket : Journal of Mechanical Engineering Integrated Science Education Journal Dulang: Jurnal Pengabdian Kepada Masyarakat Prosiding Seminar Nasional Inovasi Teknologi Terapan Jurnal Inovasi Teknologi Terapan
Zaldy Kurniawan
Teknik Mesin, Politeknik Manufaktur Negeri Bangka Belitung
Agriculture, Biological Sciences & Forestry Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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Penggunaan Fly Ash sebagai Material Bata Beton untuk Meningkatkan Daya Peredaman Panas pada Ruangan Napitupulu, Robert; Chardova, Andreas; Kurniawan, Zaldy
Manutech : Jurnal Teknologi Manufaktur Vol. 16 No. 02 (2024): Manutech: Jurnal Teknologi Manufaktur
Publisher : Politeknik Manufaktur Negeri Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33504/manutech.v16i02.445

Abstract

The use of fly ash as an additive for concrete bricks has a positive impact on the environment, in addition to reducing environmental pollution. Fly ash has a silicate content that is similar to cement, the addition of fly ash to the concrete brick mixture can be a good mineral additive for concrete bricks because fly ash contains silica which is binding. This study aims to determine the effect of fly ash waste as an additive on heat reduction and to determine the highest and lowest composition values ??for the addition of fly ash waste to concrete bricks in order to reduce heat. The method used in this study is the full factorial method with process variables of fly ash: sand 10%: 60%, 20%: 50%, 30%: 40% and drying time of 3 and 5 days, and a heat reduction test was carried out as a response observed with a total of 6 specimens and 3 replications for each specimen. Based on the research results obtained, it shows that specimens with fly ash: sand 30%: 40% with a drying time of 5 days get the highest value of 6.6oC. while fly ash: 10% sand: 60% with a drying time of 3 days obtained the lowest value of 4oC.
Analisis Pengaruh Perekat Tepung Tapioka Pada Pengurangan Kadar Abu Briket Tempurung Kelapa Pratama, Randa Julio; Napitupulu, Robert; Kurniawan, Zaldy; Darta, Yuli
Jurnal Inovasi Teknologi Terapan Vol. 3 No. 2 (2025): Jurnal Inovasi Teknologi Terapan
Publisher : Politeknik Manufaktur Negeri Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33504/jitt.v3i2.269

Abstract

Binders play a vital role in briquette production by uniting charcoal particles into a solid form. This study aims to evaluate the effect of tapioca starch concentration as a binder on reducing the ash content of coconut shell briquettes. The binder concentrations used were 10%, 15%, and 20% of the total material mixture, with ash content testing conducted according to SNI 01-6235-2000 standards. The briquette production process involved raw material preparation, mixing, molding, and drying. The results indicated that binder concentration significantly influenced the ash content of the briquettes. Lower binder concentrations resulted in reduced ash content, with the lowest ash content of 1.52% achieved at a binder concentration of 10%. Conversely, higher binder concentrations tended to increase ash content due to residual binder that did not fully combust. This study emphasizes the importance of regulating binder concentration to enhance the quality of coconut shell briquettes as an alternative fuel source.
Pengaruh Media, Temperatur Dan Waktu Perlakuan Annealing Pada Spesimen Standar ASTM D638 Type IV Menggunakan Filamen ST PLA Subakti, Yulian; -, Hasdiansah; Kurniawan, Zaldy
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 3 No 1 (2021): Edisi Agustus 2021
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (254.555 KB) | DOI: 10.36655/sprocket.v3i1.569

Abstract

Fused Deposition Modeling (FDM) is a technique of 3D Printing machines that is popularly used to print products. The printed product certainly has the ideal tensile strength characteristics if it has a precise size and good shape according to the standard. One of the materials that can be processed in a 3D printing machine is ST PLA. Research in terms of tensile testing has been carried out on PLA/ABS materials. However, tensile testing with annealing process using ST PLA filament is still very rarely done. From these problems, it is necessary to research to obtain optimal process parameters on 3D printing machines, to obtain the highest tensile strength from the annealing process using ST PLA material. This research was conducted using a 3D printer DIY Prusa model with a printing area of ​​XYZ, 300 mm x 300 mm x 350 mm. The material used is ST PLA filament with a diameter of 1.75 mm in green. The process parameters in this research are layer thickness, nozzle temperature and flow rate. For annealing media use beach sand, coffee and wheat. The shape of the test specimen follows the ASTM D638 type IV standard. As for the design of the process parameters using the Taguchi L9 method (33). The process parameter values ​​that produce the highest tensile strength without annealing are layer thickness 0.3 mm, nozzle temperature 205oC, and flow rate 100%. The annealing process parameters that produce the highest tensile strength are annealing time of 15 minutes, oven temperature of 110oC, for annealing media using coffee.
VARIASI SUDUT POTONG DAN KECEPATAN POTONG TERHADAP LAJU PEMAKANAN MATERIAL SCM 440 Pratama, Arianda; Kurniawan, Zaldy; -, Husman; Wahyudie, Ilham Ary
Machine : Jurnal Teknik Mesin Vol 9 No 2 (2023): Machine : Jurnal Teknik Mesin
Publisher : Jurusan Teknik Mesin Fakultas Sains dan Teknik Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jm.v9i2.3611

Abstract

During the workpiece turning process, several factors affect the final workpiece, such as the cutting angle and cutting speed. The purpose of this study was to determine the effect of variations in cutting angle and cutting speed on the material consumption rate of SCM 440. The method used in this study is the Response Surface Methodology (RSM), with a two-parameter design, each of which has three levels for each parameter variation. . The results of data analysis obtained eigen values ​​with different signs (positive and negative) which indicated that the stationary point values ​​were in the form of saddle points with a stationary point values of x1 (cutting angle) of -1.686 and x2 (Vc) of 0.199. From the uncoded process, the optimal value for the MRR factor is obtained, namely the cut angle of 10.64° and Vc of 15.28 m/min. The optimum feed rate for SCM 440 material is obtained at an optimal value of neither minimum nor maximum or a saddle point shape at a cutting angle cut of 10.64° and Vc of 15.28 m/min with an MRR area of ​​300-400 mm3/minute.
MINIMALISASI MINIMUM ZONE CIRCLE MENGGUNAKAN METODE STATIONARY POINT Oktriadi, Yudi; Saputra, Anggi; Kurniawan, Zaldy; Wahyudie, Ilham Ary
Jurnal Rekayasa Mesin Vol. 16 No. 1 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i1.1727

Abstract

The success of the manufacturing world in improving production processes is greatly influenced by the machine equipment used. SKD-11 steel has high wear resistance and good ductility, so it is suitable for components that require high precision and durability. Surface Response Method (RSM) Box-Behnken Design can be used in the optimization process, which has three variables that can predict the best optimum value. The roundness variable used in this research is MZC (Minimum Zone Circle), whose non-roundness value is the difference between the radius of the most extensive circle profile and the smallest circle profile, MZC. From the test results, it was found that the smallest non-sphericity was 7.5 μm. The optimal value for this test is VC 234.784 m/minute, feeding 0.127 mm/rev and depth of cut 0.18 mm, and the predicted response value is 13.05 μm. From the results of the ANOVA analysis, these three factors have no effect on roundness, but there is one factor that almost influences roundness, namely the depth of cut.
Optimization of Surface Roughness in CNC Turning of SS 304 Stainless Steel Using Respon Surface Methodology Aiwa, Toto; Husman; Zaldy Kurniawan
Jurnal Rekayasa Mesin Vol. 20 No. 3 (2025): Volume 20, Nomor 3, Desember 2025
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v20i3.7169

Abstract

Surface roughness is one of the important indicators in assessing machining results, especially in stainless steel (SS 304). This study aims to determine the influence of machining parameters, namely spindle speed, feeding speed, and feeding depth on the surface roughness of stainless steel material (SS 304) in the turning process using the mori seiki sl-25 CNC machine. The research was conducted using the Response Surface Methodology (RSM) method and the experimental design of Box-Behnken Design (BBD) to obtain the best combination of parameters. Previous research has only examined two variables separately without considering the feed rate at the same time. The results of this study show that among the 3 factor variables, only one factor, namely the speed of interpretation that can reject Ho with a value of f calculated as 4.79>4.77, which means that the speed of interpretation has a significant influence on the degree of roughness compared to other variables.  
Cooling Media–Driven Shift in Dominant Machining Mechanisms: A Taguchi-Based Optimization of Surface Roughness in CNC Milling of S45C Steel Faing, Fatullah; Yudo, Eko; Kurniawan, Zaldy
Integrated Science Education Journal Vol 7 No 1 (2026): January
Publisher : Cahaya Ilmu Cendekia Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37251/isej.v7i1.2643

Abstract

Purpose of the study: Is to optimize the surface roughness in CNC milling of S45C steel using two types of cooling media: Dromus and radiator water. Methodology: This study employed the Taguchi experimental design method to compare cooling media. Three main machining parameters, namely spindle speed, depth of cut, and feed rate, were examined at three levels using a Taguchi L9 orthogonal array. In addition, two different cooling media, namely radiator water and Dromus, were applied to investigate their effects on surface integrity. Surface roughness values ​​were measured using a standard surface roughness tester and analyzed using the Signal-to-Noise (S/N) ratio, with the results supported by Analysis of Variance (ANOVA). Main Findings: The results demonstrate that cooling media play a decisive role not only in reducing surface roughness but also in shifting the dominant machining parameter. Under radiator water cooling, spindle speed was the most influential factor, contributing 45.67% to surface roughness variation. In contrast, when Dromus was applied, depth of cut became the dominant parameter with a contribution of 63.40%. Dromus consistently produced lower surface roughness values and higher S/N ratios, indicating improved thermal control and process stability. The optimal machining condition was identified at a spindle speed of 1910 rpm, a depth of cut of 0.2 mm, and a feed rate of 330 mm/min. Novelty/Originality of this study: The novelty of this study lies in revealing how cooling media fundamentally alter surface formation mechanisms and parameter dominance, offering new insights for adaptive and efficient CNC milling optimization strategies.
PENGARUH BENTUK GERAM DENGAN MEMVARIASIKAN SUDUT POTONG PAHAT TERHADAP KEKASARAN PERMUKAAN MATERIAL S45C DENGAN MENGGUNAKAN MESIN BUBUT GEMINIS Satrio Ramadhan, Geril; Kurniawan, Zaldy; Amrullah, Muhammad Haritsah
Prosiding Seminar Nasional Inovasi Teknologi Terapan Vol. 2 No. 01 (2022): Prosiding Seminar Nasional Inovasi Teknologi Terapan
Publisher : Politeknik Manufaktur Negeri Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Shaft is one of the materials that must have a low surface roughness value from the machining process, especially using the Tornos Geminis S.L semi-automatic lathe. The purpose of this study was to determine the effect of the furious form on the surface roughness of the S45C material. This study used factor variables that are thought to affect the shape and surface roughness of the S45C material, namely, the cutting angle of the chisel with a level (80o, 82o, 84o), feeding depth with a level (0.4 mm, 0.6 mm, 0.8 mm) and Spindle rotation with levels (200 RPM, 280 RPM, 360 RPM). The lowest surface roughness value for the S45C material was obtained from the variation of the chisel cutting angle factor of 80º, infeed depth of 0.4 mm, and spindle rotation of 280 RPM with a surface roughness value of 5.171 . From the lowest value of surface roughness, a tubular growl (short) is produced.
ANALISIS VARIASI PARAMETER PROSES PERMESINAN TERHADAP TINGKAT KEKASARAN PERMUKAAN MATERIAL SKD 11 DENGAN MENGGUNAKAN MESIN BUBUT GEMINIS Fachrezi, Rizki; KURNIAWAN, ZALDY; ASWIN, FAJAR
Prosiding Seminar Nasional Inovasi Teknologi Terapan Vol. 2 No. 01 (2022): Prosiding Seminar Nasional Inovasi Teknologi Terapan
Publisher : Politeknik Manufaktur Negeri Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The success of the world's manufacturing industry to improve production processes is strongly influenced by the production machine tools used. Shaft is a product that requires a low surface roughness value during lathe processing, especially the Tornos Geminis S.L. semi-automatic lathe. The purpose of this study was to determine the surface roughness of carbon steel. This study uses parameters that affect the shape of the surface roughness value of the SKD11 material, namely the spindle rotation rate (1000 Rpm, 760 Rpm, 610 Rpm), feed depth level (0.4 mm, 0.6 mm, 0.8 mm)) and feeding speed. (0.8mm)/put, 0.9mm/put, 0.10mm/put). The lowest value of surface roughness of the Skd 11 material was obtained with a spindle speed of 1000 Rpm, feed rate of 0.9 mm/put and depth of cut 0.4 mm, and a surface roughness value of 1.636 m.
STUDI EKSPERIMEN PENGARUH SUHU HARDENING DENGAN QUENCHING MEDIA AIR LAUT TERHADAP KETANGGUHAN BAJA ST 60 Abdillah Halim; Subhan, Muhammad; Kurniawan, Zaldy
Prosiding Seminar Nasional Inovasi Teknologi Terapan Vol. 2 No. 01 (2022): Prosiding Seminar Nasional Inovasi Teknologi Terapan
Publisher : Politeknik Manufaktur Negeri Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

ST 60 steel is a medium carbon steel that is often used in machine construction such as shafts and shipbuilding, but impact loads often occur. The purpose of this study was to determine the best toughness of st60 steel from the effect of temperature on the hardening process. The method used for data processing in this study is the two way ANOVA method without interaction. The variables used in this study were temperature (900, 930, 950⁰C) and holding time (30, 60, 90 minutes). The best toughness results were obtained at a temperature of 900⁰C with a holding time of 30 minutes (2.5934 J/mm2) with the lowest toughness results were obtained at a temperature of 950⁰C and a holding time of 90 minutes was obtained at (2.5588 J/mm2).
Co-Authors A Adjie Abdillah Halim Aiwa, Toto Angga, Muhammad Angga Pratama anggi saputra Arianda Pratama Arif Budi Pamungkas Ariyanto Ariyanto Arya Adjie Aswin, Fajar chardova, andreas Darta, Yuli Deri Saputra, Deri Dika Qomara Sari Djauhari Djauhari Eko Yudo Erick wiratama Erin Aftarini Erwansyah, Erwansyah Fachrezi, Rizki Faing, Fatullah Febriyansa, Agus Feriadi, Indra Findra Setyanto Firdi Irawan Gilang Perdana Harwadi, Harwadi Hasdiansah, Hasdiansah Husman Husman I Mahyudi Ilham Ary Wahyudie Ival Ival Mahendra, Anan Masdani, Masdani Muhammad Haritsah Amrullah Muhammad Subhan Muhammad Subhan Muhammad Yunus Odidio Pratama Odidio Oktriadi, Yudi Pranata, Yogi Pratama, Arianda Pratama, Randa Julio Pristiansyah, Pristiansyah Rapiansah Rapiansah Restu, Ilham Ridho Rosmansyah Robert Napitupulu Rodika Rollastin, Boy S.Pd. M Kes I Ketut Sudiana . Said Apreza Satrio Ramadhan, Geril Seva, Marcell Subakti, Yulian Sugianto Sugianto Suzen, Zaldy Sirwansyah Syamsul Arifin Trisna Fitri Mutiari Yuliyanto Yuliyanto Zanu Saputra Zulkipli Zulkipli