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Dr. Remon Lapisa
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IMEIRS Indonesian Mechanical Electrical and Industrial Research Society Jl. Tanjung Indah I No E 45 Lapai Nanggalo, Padang 25142
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INDONESIA
MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering
ISSN : 26557215     EISSN : 26852098     DOI : -
MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering is an international peer-reviewed journal dedicated to interchange for the results of high quality research in all aspect of mechanical, electrical and industrial enineering and science. The journal publishes state-of-art papers in fundamental theory, experiments and simulation, as well as applications, with a systematic proposed method, sufficient review on previous works, expanded discussion and concise conclusion. As our commitment to the advancement of science and technology, the MOTIVECTION follows the open access policy that allows the published articles freely available online without any subscription. Scope : Engineering and Applied Sciences - Mechanical - Electrical - Automotive - Industrial - Mining - etc.
Articles 138 Documents
Ergonomic System Tennis Referee Chair Design Ricky Andrianto; Irzal Irzal; Purwantono Purwantono; Delima Yanti Sari
MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering Vol 2 No 2 (2020): Motivection : Journal of Mechanical, Electrical and Industrial Engineering
Publisher : Indonesian Mechanical Electrical and Industrial Research Society (IMEIRS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (344.716 KB) | DOI: 10.46574/motivection.v2i2.46

Abstract

The referee chair is still up using the stairs by holding on to the leg of the chair or on the steps and facing the chair. After arriving on the chair, the referee must turn around to sit in the seat, this is very dangerous and can cause accidents because there is no safety to ride the referee's chair.Build and analyze the drive system in the design of an ergonomic tennis referee chair. This study uses an experimental method, which is included in the engineering and manufacturing of a machine. The testing process is carried out 5 times up and down with different loads, the results of 5 times the same test is 0.73m / minute, this is caused by the rotation generated by the same gearbox, so that the load does not affect the speed up and down the referee seat of the ergonomic system. From the results of the measurement known height of the early 56 cm and maximum height of 160 cm with a tilt 60 ̊. The maximum height that can be reached by the referee if calculated from a height of mor is 145.009246 cm. Kursi wasit masih dinaiki menggunakan tangga dengan berpegang pada kaki kursi atau pada anak tangga dan menghadap ke kursi. Setelah sampai diatas kursi, wasit harus memutar badan untuk duduk di tempat duduk, hal ini sangat berbahaya dan dapat menyebabkan kecelakaan karena tidak adanya pengaman untuk menaiki kursi wasit.Membangun dan menganalisis sistem penggerak pada rancang bangun kursi wasit Tenis sistem ergonomis. Penelitian ini menggunakan metode eksperimen, yakni termasuk kedalam rekayasa dan pembuatan suatu mesin. Proses pengujian dilakukan sebanyak 5 kali naik turun dengan beban yang berbeda, hasil dari 5 kali pengujian tersebut sama yaitu 0,73m/menit, hal ini disebabkan oleh putaran yang dihasilkan oleh gearbok sama, sehingga beban tidak mempengaruhi kecepatan naik dan turun kursi wasit sistem ergonomis. Dari hasil pengukuran diketahui tinggi mur awal 56 cm dan tinggi maksimal mur 160 cm dengan kemiringan 60̊. Tinggi maksimal yang dapat dicapai kursi wasit jika di hitung dari ketinggian mor adalah 145,009246 cm.
Heat Transfer Analysis in Heat Exchanger with Various Shifting Media Endri Rizki Anugrah; Remon Lapisa; Arwizet K; Ambiyar Ambiyar
MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering Vol 2 No 2 (2020): Motivection : Journal of Mechanical, Electrical and Industrial Engineering
Publisher : Indonesian Mechanical Electrical and Industrial Research Society (IMEIRS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (474.439 KB) | DOI: 10.46574/motivection.v2i2.47

Abstract

Solar panels (photovoltaics) function to absorb sunlight exposure to be converted into electrical energy. But if the heat received over the sun, it will reduce the electrical power of the solar panels. Therefore, a heat transfer device is required to maintain the temperature of the solar panels always in the optimal condition to work. The measurement results show that the average temperature out of the panel (T1) is greater than in the panel (T2), the upper temperature of the tank (T5) is greater than the bottom temperature of the tank (T6), and the average temperature value in the tank (T4) is between the upper temperature of the tank (T5) and the bottom temperature of the tank (T6) of any variation of the sender's media. Meanwhile, the difference between the entry temperature (T2) and the exit temperature (T1) in the study indicates how well the medium of the conducter absorbs excessive heat. Then it can be concluded that the medium of coolant is the best conducter media to absorb and conduct heat because it has a difference out panel (T1) and in panel (T2 amounted to 6.522 °c from Air Aki soft-0.0375 ° C, and water ordinary 1.069 °c. Panel surya (Photovoltaic) berfungsi menyerap paparan cahaya matahari untuk diubah menjadi energi listrik. Namun jika panas matahari yang diterima berlebih, akan mengurangi daya listrik hasil panel surya tersebut. Maka dari itu diperlukan sebuah alat pemindah panas yang mampu menjaga suhu panel surya selalu didalam keadaan optimal untuk bekerja. Hasil pengukuran menunjukkan bahwa rata-rata suhu out panel (T1) lebih besar daripada in panel (T2), suhu atas tangki (T5) lebih besar daripada suhu bawah tangki (T6), dan nilai rata-rata suhu in tangki (T4) berada diantara suhu atas tangki (T5) dan suhu bawah tangki (T6) dari setiap variasi media penghantar. Sementara selisih dari suhu masuk (T2) dan suhu keluar (T1) pada penelitian mengindikasikan seberapa bagus media penghantar dalam menyerap panas yang berlebih. Maka dapat disimpulkan media penghantar coolant adalah media penghantar yang paling baik dalam menyerap dan menghantarkan panas karna memiliki selisih out panel (T1) dan in panel (T2 sebesar 6,522 °C daripada Air Aki Lunak sebesar –0,0375 °C, dan Air biasa 1,069 °C.
Influence of Temperature and Time Carbonization on Calorific Value of Charcoal Briquette Raw Materials Areca Nut Husk Riski Camarta; Hendri Nurdin; Nelvi Erizon; Andril Arafat
MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering Vol 2 No 2 (2020): Motivection : Journal of Mechanical, Electrical and Industrial Engineering
Publisher : Indonesian Mechanical Electrical and Industrial Research Society (IMEIRS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (357.979 KB) | DOI: 10.46574/motivection.v2i2.51

Abstract

Areca nut husk is one type of biomass that can be used as raw material for briquettes as an alternative energy producer. Charcoal briquettes are solid fuels that can be used as alternative fuels in an effort to meet energy needs. This study aims to assess the quality of areca nut charcoal briquettes through carbonization at temperatures of 200 ° C, 250 ° C, 300 ° C, 350 ° C and 400 ° C at holding times for 30, 60 and 90 minutes. The study was conducted by pyrolysis of areca nut briquettes which had been formed and dried. Testing the quality of charcoal briquettes includes calorific value analysis. The results of this study indicate the highest heating value of coir briquette charcoal is at carbonization temperature of 300 ° C for 60 minutes at 20979,13632 KJ/Kg. Serat buah pinang merupakan salah satu jenis biomassa yang dapat dimanfaatkan menjadi bahan baku briket sebagai penghasil energi alternatif dalam mengurangi penggunaan bahan bakar fosil (minyak bumi). Briket arang merupakan bahan bakar padat yang dapat dijadikan sebagai bahan bakar alternatif dalam upaya untuk dapat memenuhi kebutuhan energi. Pembuatan briket menggunakan perekat tapioka dengan komposisi biomassa dan perekat sebanyak 80% dan 20%. Penelitian ini bertujuan untuk mengkaji kualitas briket arang serat buah pinang melalui proses karbonisasi pada temperatur 200°C, 250°C, 300°C, 350°C dan 400°C pada waktu tahan selama 30, 60 dan 90 menit. Pengujian kualitas briket arang meliputi analisis nilai kalor. Hasil penelitian ini menunjukkan nilai kalor briket arang serat buah pinang tertinggi terdapat pada temperatur karbonisasi 300°C selama 60 menit sebesar 20979,13632 KJ/Kg.
Effect Variation Side Rake Angle and Depth of Cut Shapping Flat to Low Carbon Steel ST-37 Surface Roughness Value Muhammad Ichsan; Yufrizal A; Refdinal Refdinal; Rifelino Rifelino
MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering Vol 2 No 2 (2020): Motivection : Journal of Mechanical, Electrical and Industrial Engineering
Publisher : Indonesian Mechanical Electrical and Industrial Research Society (IMEIRS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (315.322 KB) | DOI: 10.46574/motivection.v2i2.53

Abstract

The product quality of the production process using such production machine is always associated with dimensional precision, tolerance, and surface roughness. It is difficult to obtain the surface quality of the desired workpiece and yet to be aware of the precise parameters of the chisel eye angle, so that when the surface quality flat suction is not fixed and not as desired Problems in this study. The purpose of the study is to determine the influence of one of the different eye angle variations of the chisel, the Side Rake Angle and the depth of the cut to the small surface roughness value in the workpiece of flat shapping. The method used in this research is the experimental method. The results showed, from nine times the test gained two good tests on the roughness of the ST-37 steel material the first test of variation side rake angle 14 ⁰ at a depth of cut 0.5 mm as many as 3 specimens with a total surface roughness value of three specimens of 3.35 μm and the fourth Test was with a variation of side rake angle 16 ⁰ at a depth of 0.5 mm as many as 3 specimens with a total roughness value of 3.47 μm and a roughness value Each specimen in class N8. Kualitas produk dari proses produksi yang menggunakan mesin-mesin perkakas produksi selalu dikaitkan dengan ketepatan dimensi, toleransi, dan kekasaran permukaan. Sulitnya untuk mendapatkan kualitas permukaan benda kerja yang di inginkan serta belum diketahuinya parameter sudut mata pahat yang tepat menjadi masalah dalam penelitian ini. Tujuan penelitian adalah untuk mengetahui pengaruh salah satu variasi sudut mata pahat yaitu Side Rake Angle dan kedalaman pemotongan terhadap nilai kekasaran permukaan yang kecil pada benda kerja hasil penyekrapan datar. Metode yang digunakan dalam penelitian ini adalah metode eksperimen. Hasil penelitian menunjukan, dari Sembilan kali pengujian didapat dua pengujian yang bagus terhadap kekasaran bahan baja ST-37 yaitu pada pengujian pertama variasi side rake angle 14⁰ pada kedalaman pemotongan 0,5 mm dengan nilai kekasaran permukaan total ketiga spesimen 3,35 µm dan pengujian keempat yaitu dengan variasi side rake angle 16⁰ pada kedalaman pemotongan 0,5 mm dengan nilai kekasaran total 3,47 µm dan nilai kekasaran masing-masing spesimen pada kelas N8.
Numerical Analysis Effect of Home Roof Design Towards Thermal Comfort of Occupants Denda Afri Juliadi; Remon Lapisa; Purwantono Purwantono; Hendri Nurdin
MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering Vol 2 No 2 (2020): Motivection : Journal of Mechanical, Electrical and Industrial Engineering
Publisher : Indonesian Mechanical Electrical and Industrial Research Society (IMEIRS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1313.615 KB) | DOI: 10.46574/motivection.v2i2.54

Abstract

The cool room temperature is a requirement in the thermal comfort of a building. In earthquake prone areas, building structures should be designed with minimal material weight. Therefore, it is necessary to be aware of an alternative solution to ensure the room's thermal comfort with minimal weight. This research aims to analyze the influence of roof slope 15O, 20O, 25O, 30O, 35O, 40O, and 45O on the comfort of the room and the strength of the building in the house measuring 6 meters x 8 meters x 3 meters. Analysis is done with three software that is SketchUp as a design, CONTAM to analyze air pressure and TRNSYS to simulate all the data that has been created in SketchUp and CONTAM. Obtained the lowest temperature at a roof slope of 45O and the lowest weight is the roof with a 15O slope. Temperatur ruangan yang sejuk merupakan syarat dalam kenyamanan termal sebuah bangunan. Di kawasan rawan gempa, struktur bangunan harus dirancang dengan bobot material yang minimal. Oleh karena itu, perlu dicarikan solusi alternatif untuk menjamin kenyaman termal ruangan dengan bobot yang minimal. Penelitian ini bertujuan menganalisa pengaruh kemiringan atap 15o, 20o, 25o, 30o, 35o, 40o, dan 45o terhadap kenyamanan ruangan serta kekuatan bangunan pada rumah berukuran 6 meter x 8 meter x 3 meter. Analisa dilakukan dengan tiga software yaitu SketchUp sebagai perancangan, CONTAM untuk menganalisa tekanan udara serta TRNSYS untuk menyimulasikan semua data yang telah di buat pada SketchUp dan CONTAM. Didapatkan hasil suhu terendah berada pada kemiringan atap 45 o dan bobot terendah adalah atap dengan kemiringan 15o.
An Analisys Of The Heating Value Of Briquettes Made From A Mixture Of Rice Husk and Tea Dregs using Tapioca Adhesive Hendra Irawan; Hendri Nurdin; Ambyar Ambyar; Rahmat Azis Nabawi
MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering Vol 2 No 2 (2020): Motivection : Journal of Mechanical, Electrical and Industrial Engineering
Publisher : Indonesian Mechanical Electrical and Industrial Research Society (IMEIRS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (347.259 KB) | DOI: 10.46574/motivection.v2i2.57

Abstract

Increased energy consumption and lack of public knowledge to utilize rice husks and tea pulp as the most untapped briquette. The purpose of this research is to obtain a Calor value produced by rice husk briquette and tea pulp to be used as a briquette as an alternative fuel.. The results of the heat value test conducted using the Bomb calorimeter test tool showed optimum heat value in the variation of the 80% rice husk mixture and tea pulp and 20% tapioca adhesive, the value of the resulting heat of 11,638,112 kj/kg. This shows that the rice husk briquette and tea pulp with a mixture of comparison of 80% mixture of raw materials with 20% tapioca as higher glues produce a Calor value than 3 other variations. Based on the process that has been done shows that rice husk and tea pulp are potentially an alternative fuel.briquette and testing showed that rice husk and tea pulp could be potentially alternative fuel Konsumsi energi yang semakin meningkat dan kurangnya pengetahuan masyarakat dalam memanfaatkan sekam padi dan ampas teh sebagai briket yang belum dimanfaatkan secara maksimal. Tujuan penelitian ini adalah untuk mendapatkan nilai kalor yang dihasilkan briket sekam padi dan ampas teh untuk dijadikan briket sebagai bahan bakar alternatif.. Hasil pengujian nilai kalor yang dilakukan mengunakan alat bomb calorimeter test menunjukan nilai kalor yang optimum pada variasi 80% campuran sekam padi dan ampas teh dan 20% perekat tapioka, nilai kalor yang dihasilkan sebesar 11638.112 kj/kg. Hal ini menunjukan bahwa briket sekam padi dan ampas teh dengan perbandingan campuran 80% campuran bahan baku dengan 20% tapioka sebagai perekatnya lebih tinggi menghasilkan nilai kalor dari 3 variasi lainnya. Berdasarkan proses yang telah dilakukan menunjukan bahwa sekam padi dan ampas teh berpotensi sebagai bahan bakar alternatif.
Thermal Analysis of Solar Protection on Windows in Tropical Areas Fadhilla Azherda; Remon Lapisa; Waskito Waskito; Hasanuddin Hasanuddin
MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering Vol 2 No 2 (2020): Motivection : Journal of Mechanical, Electrical and Industrial Engineering
Publisher : Indonesian Mechanical Electrical and Industrial Research Society (IMEIRS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (402.079 KB) | DOI: 10.46574/motivection.v2i2.58

Abstract

Thermal comfort is one element of comfort that is very important, because it concerns the condition of the room temperature. Where the cool temperature in the room is a condition of thermal comfort of a building, besides indoor lighting also affects the comfort of the room. The building window is one of the factors that affects the thermal comfort of the building, therefore, it is necessary to find the solution for the heat absorption that occurs through the glass window not directly into the building. This research aims to analyze the solar protection on the windows of the building on the teropical climate, in the windows of paired Building solar protection (Solar Shading) that can be variated tilt angle. which uses a variation of tilt angles of 0 ° (-), 45 ° (/), and 90 ° (|) with the aim of obtaining indoor thermal comfort as well as indoor lighting. Kenyamanan termal merupakan salah satu unsur kenyamanan yang sangat penting, karena menyangkut kondisi suhu ruangan. Dimana temperature dalam ruangan yang sejuk adalah syarat kenyamanan termal suatu bangunan, selain itu pencahayaan dalam ruangan juga mempengaruhi kenyamana dalam ruangan. Jendela bangunan merupakan salah satu faktor yang mempengaruhi kenyamanan termal pada bangunan, Oleh karena itu perlu dicarikan solusi agar penyerapan panas yang terjadi melalui jendela kaca tidak lansung masuk kedalam bangunan. Penelitian ini bertujuan untuk menganalisis proteksi surya pada jendela bangunan pada iklim teropis, pada jendela bangunan dipasangkan proteksi surya (Solar Shading) yang dapat divariasikan sudut kemiringan. dimana menggunakan variasi sudut kemiringan 0˚(-), 45˚(/), dan 90˚(|) dengan tujuan mendapatkan kenyamanan termal dalam ruangan dan juga pencahayaan dalam ruangan.
Build Design Of Electric Bike As Energy Efficient Transportation Sundhy Pareza; Purwantono Purwantono; Remon Lapisa; Primawati Primawati
MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering Vol 2 No 2 (2020): Motivection : Journal of Mechanical, Electrical and Industrial Engineering
Publisher : Indonesian Mechanical Electrical and Industrial Research Society (IMEIRS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1152.952 KB) | DOI: 10.46574/motivection.v2i2.59

Abstract

The issue of global warming is very strong in the force in the procession, the damage caused by global warming is very influential in the survival of living beings. The methods performed in this study are experimental methods. The experiments performed were to make a design and to become a unity so that it formed a tool of electric bicycle transportation that can be used well. This thesis author devise and assemble electric bicycle using DC electric motor 24 Volt 250 Watt and 3000 rpm. The power system used is 24 Volt 12 Ampere battery. From the results of the test and analysis of data that has been taken on the electric bicycle obtained data of the average speed obtained by the electric bike with a load of 78 = 4.94 m/s, load 83 = 4.59 m/s, load 88 = 4.25 m/s, power output to drive electric bicycle with load 78 = 266.679 Watt, load 83 = 263.810 Watt, load 88 = 258.984 Watt. Isu pemanasan global sangat kuat di gencar disuarakan, kerusakan yang disebabkan pemanasan global sangat berpengaruh pada kelangsungan hidup makluk hidup. Metode yang dilakukan dalam penelitian ini adalah metode eksperimen. Eksperimen yang dilakukan adalah membuat sebuah rancangan dan merakitnya menjadi suatu kesatuan sehingga terbentuk sebuah alat transportasi sepeda listrikyang dapat digunakan dengan baik. Skripsi ini penulis merancang dan merakit sepeda listrik dengan menggunakan motor listrik DC 24 Volt 250 Watt dan 3000 rpm. Sistem daya yang digunakan adalah baterai 24 Volt 12 Ampere. Dari hasil pengujian dan analisis data yang telah diambil pada sepeda listrik didapatkan data berupa kecepatan rata-rata yang didapatkan sepeda listrik dengan beban 78 = 4,94 m/s, beban 83 = 4,59 m/s, beban 88 = 4,25 m/s, daya output untuk menggerakkan sepeda listrik dengan beban 78 = 266,679 Watt, beban 83 = 263,810 Watt, beban 88 = 258,984 Watt.
Power Consumption Analysis of a BLDC 24V 250W Electric Bike on An Assembled Lithium-ion Battery Pack Wahyudi Fachrul Syafra; Purwantono Purwantono; Hasanuddin Hasanuddin; Arwizet K
MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering Vol 2 No 3 (2020): Motivection : Journal of Mechanical, Electrical and Industrial Engineering
Publisher : Indonesian Mechanical Electrical and Industrial Research Society (IMEIRS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (334.023 KB) | DOI: 10.46574/motivection.v2i3.63

Abstract

This research is using experimental method. Tests carried out on electric bicycles with 250 Watt Brushless DC motor drive. The total power consumption is obtained through testing the use of electric bicycles which starts from the maximum battery condition until the bike cannot move. The battery used is a type of lithium ion assembly with a total capacity of 29.12 Volt 20Ah. In testing, the bike was driven at maximum speed, with a 65kg rider. In the first test, a distance of 30.6 Km was reached with a power consumption of 1041.1 Watt, 112 minutes of travel time. The second test as far as 31.1 Km requires 1090.8 Watts of power takes 117 minutes. And the 3rd test reached a distance of 35.9 Km with 1178 Watts of power and 128 minutes of travel time. It was also found that the battery was unable to move the bike at the lowest voltage of 22.1 Volt. Penelitian ini menggunakan metode eksperimen. Pengujian dilakukan pada sepeda listrik dengan penggerak motor Brushless DC 24V 250 Watt. Total konsumsi daya didapat melalui pengujian pemakaian sepeda listrik yang dimulai dari kondisi baterai maksimum sampai sepeda tidak dapat bergerak. Baterai yang digunakan adalah jenis lithium ion rakitan dengan total kapasitas 29.12 Volt 20Ah. Pada pengujian, sepeda digerakan dengan kecepatan maksimalnya, dengan baban pengendara 65Kg. Pada pengujian pertama tercapai jarak 30.6 Km dengan konsumsi daya 1041.1 Watt, waktu tempuh 112 menit. Pengujian ke-2 sejauh 31.1 Km membutuhkan daya 1090.8 Watt waktu tempuh 117 menit. Dan pengujian ke-3 mencapai jarak 35.9 Km dengan daya 1178 Watt dan waktu tempuh selama 128 menit. Didapati juga hasil bahwa baterai tidak mampu mengerakan sepeda pada tegangan terendah sebesar 22.1 Volt.
Effect of Cutting Condition on the Surface Roughness Level of ST 42 Steel in Conventional Lathe Processes Doni Hamdani; Irzal Irzal; Nofri Helmi; Rifelino Rifelino
MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering Vol 2 No 3 (2020): Motivection : Journal of Mechanical, Electrical and Industrial Engineering
Publisher : Indonesian Mechanical Electrical and Industrial Research Society (IMEIRS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (325.689 KB) | DOI: 10.46574/motivection.v2i3.64

Abstract

Cutting conditions carried out in the turning or manufacturing process will have an impact on the quality of the components produced. One indicator of the quality of turning or manufacturing is surface roughness on the object. The purpose of this research is to determine the ratio of the level of surface roughness of ST 42 steel after conventional turning with different cutting conditions by varying the main cutting angle and cutting depth and its effect on the rate of wasted material (MRR). The main cutting angles used in this study were Kr 90, 80, 70 and variations in cutting depth of 0.5 mm, 1 mm, 1.5 mm. From the data obtained in this research process using several variations of cutting conditions that produce a good average roughness value is Kr 80, a = 0.5 mm, MRR = 0, 89 cm3 / min, with a roughness value of 1.89 µm . Based on the data obtained it can be concluded that the greater the depth of cutting, the higher the rate of wasted material (MRR) and the higher the level of surface roughness and vice versa. Kondisi pemotongan yang dilakukan pada proses pembubutan atau manufaktur akan berdampak terhadap kualitas komponen yang diproduksi. Salah satu indikator dari kualitas hasil pembubutan atau manufaktur adalah kekasaran permukaan pada benda tersebut. Adapun penelitian ini bertujuan untuk menentukan perbandingan tingakat kekasaran permukaan baja ST 42 pasca pembubutan konvensional dengan kondisi pemotongan yang berbeda dengan memvariasikan sudut potong utama dan kedalaman pemotongan serta pengaruhnya terhadap laju bahan bahan terbuang (MRR). Sudut potong utama yang digunakan pada penelitian ini adalah Kr 90, 80, 70 serta variasi kedalaman pemotongan 0,5 mm, 1 mm, 1,5 mm. Dari data yang diperoleh pada proses penelitian ini dengan menggunakan beberapa variasi kondisi pemotongan yang menghasilkan nilai rata-rata kekasaran yang baik adalah Kr 80, a = 0,5 mm, MRR = 0, 89 cm3/mnt, dengan nilai kekasarannya 1,89 µm. Berdasarkan data yang didapat maka dapat disimpulkan bahwa semakin besar kedalaman pemotongan maka semakin tinggi laju bahan terbuang (MRR) dan semakin tinggi tingkat kekasaran permukaan maupun sebaliknya.

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