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All Journal Jurnal Sains dan Teknologi Rekayasa Mesin ROTOR: JURNAL ILMIAH TEKNIK MESIN Dharma Raflesia : Jurnal Ilmiah Pengembangan dan Penerapan IPTEKS Majalah Teknik Simes METAL : Jurnal Sistem Mekanik dan Termal Ta'dib Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin

Nurbaiti Nurbaiti

Universitas Bengkulu

Author-ID : 4090892

Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Transportation Other

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Perbandingan Eksperimental dan Simulasi Frekuensi Pribadi pada Struktur Spindel CNC Hoten, Hendri Van; Nurbaiti, Nurbaiti; Mainil, Afdhal Kurniawan; Silitonga, Jhonson Van
Jurnal Rekayasa Mesin Vol 11, No 3 (2020)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2020.011.03.22

The Research was about the comparison between experiment and simulation of natural frequency in CNC spindle. CNC spindle vibration will reduce machine tool performance. It could lead to the damage of the machine tool. The spindle structure unbalances of machine tools will cause vibration when it is operated. In the CNC machine, the spindle shaft vibration should be minimum. Based on this point, the natural frequency testing on the spindle shaft structure was carried out. The experiments were conducted by employing oscilloscope which could provide the vibration data in the time domain. The data was converted into the frequency domain using FFT. Measurements were carried out on 7 times of testing. Every one time of testing, 10 data were taken at each testing points. The tests were conducted at 10 testing points. Therefore, the total data obtained were 700 test data. The test results were then compared with the results of simulation modeling in 10 vibrate modes using Solidwork software. After testing and simulations were compared, 4 personal frequency values were obtained in the test that uses a measuring instrument and 6 personal frequency values could not be read. These were because the accelerometer used could not read up to 0 Hz frequency. Natural frequency obtained from simulations and tests were expressed in the percentage of errors. The largest error value in the 9th vibration mode measurement with a natural frequency was 2117.96 Hz with an error of 0.32%. The smallest error value was 0.11% with a natural frequency of 2995.79 Hz.

TINGKAT KEHALUSAN DAN NOMOR BUTIR SERBUK BIOKERAMIK MENGGUNAKAN AYAKAN GETAR Hendri Van Hoten; Nurbaiti Nurbaiti; Afdhal Kurniawan Mainil
Jurnal Sains dan Teknologi Vol 19, No 2 (2020): Jurnal Sains dan Teknologi
Publisher : Fakultas Teknik Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jst.v19.n2.p58-62

Penelitian ini akan membahas Pengecekan Tingkat Kehalusan dan Nomor Butir Serbuk Biokeramik Menggunakan Ayakan Getar. Biokeramik tersebut di proses terlebih dahulu menggunakan mesin Ball Mill dengan memvariasikan kecepatan dan waktu proses penggilingan serta nilai perbandingan massa serbuk terhadap massa bola penggiling. Tingkat kehalusan dan nomor butir serbuk dilakukan pengecekan menggunakan mesin ayakan getar. Nomor ayakan yang digunakan adalah 35, 60, 120 serta 230 dengan tingkat kehalusan ukuran masing-masing sieve 500, 250, 125 dan 63 µm secara berturut-turut. Ukuran dari serbuk biokeramik dari cangkang telur tersebut masih tampak kasar-kasar. Ukuran serbuk terkecil didapatkan pada variasi kecepatan dan waktu proses penggilingan serta nilai perbandingan massa serbuk terhadap massa bola penggiling berturut-turut 150 rpm, 1 jam dan 1:6 yaitu 86.5 mm, sedangkan nomor kehalusan serbuknya yaitu 191.

KARAKTERISTIK KEBULATAN TERHADAP PARAMETER PROSES PEMBUBUTAN PADA MATERIAL ST 42 MENGGUNAKAN METODE TAGUCHI DAN ANOVA Hendri Van Hoten; Rijalul Rahman Hakim; Helmizar Helmizar; Nurbaiti Nurbaiti
ROTOR Vol 14 No 2 (2021)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

This research is about the roundness characteristics of the turning process parameters on St 42 material using the Taguchi and ANOVA (Analysis of Variance) methods. A cylindrical product requires a good roundness value to ensure its quality. One of the factors that determine the quality of these products is the machining process parameters. In this study, optimization of the turning process parameters using the Taguchi and ANOVA methods was carried out on the roundness characteristics of the workpiece. The workpiece used is Steel St 42. The lathe used is the Krisbow Precision Gear Head Machine 410X1000MM. After data analysis using the Taguchi method, the parameters with the optimum roundness value of 7.385 µm were 510 rpm spindle rotation, 1mm depth of cut, and coolant opening valve. The results of the ANOVA analysis show the percent contribution of each parameter, respectively, as follows: spindle rotation 26.97%, depth of cut 24.82%, and coolant 38.63%.

Optimasi Geometri Sudut Pahat dan Parameter Proses Terhadap Kekasaran Permukaan Dengan Menggunakan Metode Taguchi Dan ANOVA Hendri Van Hoten; Roby Syaputra; Zuliantoni zuliantoni; Nurbaiti Nurbaiti; Antonius F A Silaen
MAJALAH TEKNIK SIMES Vol 12 No 2 (2018): Majalah Teknik Simes
Publisher : UNIVERSITAS PROF. DR. HAZAIRIN, SH BENGKULU

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2198.123 KB)

This research is about optimization of chipping angle geometry and process parameter to surface roughness byusing taguchi and ANOVA method. In the industrial world, especially small industries in the manfacture ofproducts that reguire some roughness they do not take into account the geometry of the chisel angle and theparameters suitable for the process. To get the geometry and parameters that fit is needed a method in order laoptimize the level of surface roughness. The Taguchi and ANOVA methods are statistical analysis methods that canbe used to optimize to get the best machining roughness. In this study the materials used are St. 37 by machiningprocess using Celtic lathe. The design of the St 37 steel lathe optimization parameter on the Celtic lathe to obtainthe chisel angle and process parameters is to use a combination of the main cutting angle of 90 °, 75 °.45o; spindle rotation (rpm) 290, 370, 460; feeding motion (mm/ rev) 0.05, 0.07, 0.09 and cutting depth (mm) 0.5,0.75, 1. This parammeter is then analyzed in Taguchi software which then analyzed by using ANOVA to find out whatpercentage of contribution of influence of level factor to test result. The optimization result of this research inspindle rotation 290 rpm, feed motion 0.05 mm/ rev, cutting depth 1 mm and main cutting angle 45 °. Percentagocontribution of each parameter to surface roughness of St 37 steel is feding motion 52,30% cuting depth 19,46%spindle rotation 14,91% and cutting angle 13,32%.

Pembuatan Produk Ring Matahari dari Pelat ASTM A36 Menggunakan Plasma Cutting OXYTOOM 20 HPC Nurbaiti Nurbaiti; Hendri Van Hoten; Candra Nico
MAJALAH TEKNIK SIMES Vol 15 No 2 (2021): Juli 2021
Publisher : UNIVERSITAS PROF. DR. HAZAIRIN, SH BENGKULU

Nowadays, Machine tools are equipped computer system, example: CNC plasma cutting machine. Computer Numerically Controlled plasma cutting is used to cut various types of metal, plate and other materials that it has good accuracy which uses heat obtained from a high concentration laser beam where the depth level is adjusted according to the thickness of the plate to be cut. One of the products is Sun Ring. Material to make this component is steel plate ASTM A36 which the thickness is 1 mm. The step to make this product is design that it help of Autocad software, Magic Logotag and Magic Tool. Result from cutting process are diameter 30.4 mm inner, 37.4 mm outer, 9.4 fin length and 3.8 mm fin width. Dimension drawing in Autocad software is bigger than workpiece size because it cut material (steel plate ASTM A36) quickly which it cause insignificant shift. Final process of this product is hone to get the actual dimension

Karakterisasi Material Braket Kawat Gigi Dalam Larutan Saliva Buatan Nurbaiti Nurbaiti; Hendri Van Hoten; Putra Bismantolo
METAL: Jurnal Sistem Mekanik dan Termal Vol 5, No 1 (2021): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

This research is about Characterization of Metal and Ceramic Brace Brackets in Artificial Saliva Solution. The shape of teeth in humans is different, some are neat and some are not. With the times, the problem of untidy teeth can be fixed using braces / braces. Nowadays, the use of braces / braces is not only for straightening teeth but for lifestyle and to support a more attractive and attractive appearance. Braces consist of brackets and curved wires. Braces brackets can be made from a variety of materials, for example: metals, ceramics and composites. This study was directed to determine the biocompatible properties of the bracket in the body by looking at the elemental content after immersion with a solution of saliva (artificial saliva) for approximately 4 weeks. The results of the hardness examination showed an increase between before and after immersion. The chemical composition examination using XRD (X-Ray Diffraction) has not shown any significant changes between the materials before and after immersion. XRD results show that there are no corrosive materials or other hazardous materials on the surface of the braces bracket material.

Recondition Cylinder Head Engine Wartsila Diesel 18V32DF Hendri Van Hoten; Hairul Gustriranda; Nurbaiti Nurbaiti
METAL: Jurnal Sistem Mekanik dan Termal Vol 3, No 2 (2019)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Power House Division (PHD) is one of the divisions that is part of PT. ABC. As an electrical energy supplier in XYZ area, Power House Division consist of four Power House, which each Power House has several engine. The first Power House (PH 1) consist of two Diesel engine Generator (DG) and one Gas Turbine in the second Power House. The third and fourth Power House consist of seven Diesel engine Generator.To keep the engine performance stable that is produce maximum power and prevent unknown damage that it make engine trip then the overhaul activity done. overhaul activity is carried out the process of replacement and recondition of spare parts of all parts of the engine. The recondition process is done in the cylinder head.Cylinder Head is an important component of a machine function as a combustion place and as an inlet and airway. There are long stages done In the process of recondition cylinder head from the demolition of cylinder head components to the re-installation of these components. There is a cylinder head that has crack, so it can not be recondition. It should be replaced with a new cylinder head. The machining process is used recondition cylinder head. They are Cutting, Lapping, and Grinding. In the pocket cylinder head, the recondition is found that it has a rust so that the size of the pocket and oversize that it has sticks around the pocket. Grinding process performed on uneven parts of valve.

Teachers` Method of Teaching English Grammar at the Senior High Schools Nurbaiti Nurbaiti; Wisma Yunita; Syahrial Syahrial; Elvina Gusman
Ta'dib Vol 26, No 1 (2023)
Publisher : Universitas Islam Negeri Mahmud Yunus Batusangkar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31958/jt.v26i1.6668

This study aimed to find out the most frequently used method in teaching English grammar at the senior high schools of Mukomuko regency and to reveal the reasons of using the most frequently used method. An explanatory mixed method design was carried out to collect and analyze the data quantitatively and qualitatively. Three instruments were used; Questionnaire, interview, and classroom observational checklist. Thirty-one English teachers filled out the questionnaire, four teachers were selected to be interviewed, and two of them were observed. The results of this study showed; first, Situational Language Teaching was the most frequently used method in teaching English grammar at the senior high schools of Mukomuko regency. Second, the English teachers implemented the most frequently used method for four reasons; 1) to encourage the students` motivation in learning the English language, 2) to facilitate the students to achieve the learning’s objective, 3) to teach English grammar to the students contextually, and 4) to evaluate the students` understanding about the material given. Based on the results, it seemed that the English teachers picked the method of teaching grammar based on its simplicity and effectiveness to activate the EFL teaching and learning process. Moreover, the result provides teachers more insight and reference regarding to the method in teaching English grammar and applied it into their teaching process

Literasi Pemanfaatan Olahan Sampah Organik Rumah Tangga pada Kelompok Mangga RT 30 Kelurahan Sawah lebar Baru Hoten, Hendri Van; Nurbaiti; Helmizar
DHARMA RAFLESIA Vol 22 No 1 (2024): JUNI (ACCREDITED SINTA 5)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/dr.v22i1.30207

As we all know, waste is a problem in daily life. The problem of waste that often occurs is the mixing or not being separated between organic and non-organic waste. The variety of organic waste is abundant and rich in minerals needed for soil fertility and by plants. Therefore, the management of organic waste is strived to become a culture at the smallest environmental level. There are two types of organic waste, solid and liquid. Organic waste is useful for composting planting media, while liquid waste is useful for liquid organic fertilizer (POC). Working alone often causes boredom, no sharing environment causes monotonous knowledge, lack of motivation, no mutual cooperation and mutual reinforcement. Therefore, a systems approach is needed through the formation of groups for the utilization of the organic waste. Through the 2021 FT Unib Development Service, the formation of Environmental Organic Waste Utilization Group among neighbors is an effort that is raised so that members of this group will manage household waste in at least one type, namely the manufacture of POCs and socialization of the processing of the waste.

MAN POWER REDUCTION EFFECT ON RAIL BRIDGE FABRICATION van Hoten, Hendri; Nurbaiti, Nurbaiti
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 3 No. 1 (2019): April 2019
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v3i1.9936

The research is to analysis the effect of reducing manpower for production process railroad bridge WTT46.5 type. The purposed manpower reduction is to increased effective production process railroad bridge WTT46.5 type and reduction manpower cost. Reduction of Manpower happened in trial process with the number 15 people and separated in some part. On of the part is in welder that is reduction in one person. Manpower reduction in trial process to improve company finance by Rp. 4.645.620,00 in every project.

Co-Authors Afdhal Kurniawan Mainil Antonius F A Silaen Bismantolo, Putra Candra Nico Elvina Gusman Hairul Gustriranda Helmizar Helmizar - Hendri van Hoten Hutapea, Gumarang Putra Bismantolo Putra, Andrio Rama Rijalul Rahman Hakim Roby Syaputra Silitonga, Jhonson Van Sulistrionio, Sulistriono Syahrial Syahrial Wiranto, Imam Wisma Yunita Yovan Witanto Zuliantoni, Zuliantoni

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