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Jurnal Polimesin
Published by Politeknik Negeri Lhokseumawe
ISSN : 16935462     EISSN : 25491199     DOI : http://dx.doi.org/10.30811/jpl
Core Subject : Science, Engineering,
Automotive Engineering Control & Systems Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering
Polimesin mostly publishes studies in the core areas of mechanical engineering, such as energy conversion, machine and mechanism design, and manufacturing technology. As science and technology develop rapidly in combination with other disciplines such as electrical, Polimesin also adapts to new facts by accepting manuscripts in mechatronics. In Biomechanics, Mechanical study in musculoskeletal and bio-tissue has been widely recognized to help better life quality for disabled people and physical rehabilitation work. Such a wide range of Polimesin could be published, but it still has criteria to apply mechanical systems and principles. Exceeding the limitation has been a common reason for rejection by those outside the scope. Using chemical principles more than mechanical ones in material engineering has been a common reason for rejection after submission. Excessive exploration of the management within the discipline of Industrial Engineering in the manufacturing technology scope is also unacceptable. The sub-scope biomechanics that focuses on ergonomics and does not study movement involving applied force on the bio-tissue is also not suitable for submission.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 9 Documents
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Search results for , issue "Vol 18, No 1 (2020): Februari" : 9 Documents clear
Analisa pengaruh variasi kampuh terhadap hasil pengelasan SMAW pada stainless steel 304 menggunakan pengujian ultrasonic dan kekuatan tarik arif rahman hakim; imran imran
Jurnal POLIMESIN Vol 18, No 1 (2020): Februari
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v18i1.1057

Abstract

Kekuatan hasil sambungan las dipengaruhi oleh berbagai faktor yang sangat beragam. Salah satunya karena perubahan struktur akibat dari proses pemanasan. Agar sambungan antara dua bagian logam memiliki mutu yang baik diperlukan suatu pengelasan yang tepat dan sambungan serta bentuk kampuh las yang sesuai dengan kegunaan dari hasil lasan tersebut. Parameter pada pengelasan SMAW meliputi kuat arus, tegangan listrik, polaritas listrik, dan sudut kampuh yang digunakan. Parameter inilah yang menjadikan dasar pemilihan yang tepat guna mendapatkan kualitas atau mutu sambungan yang baik. Tujuan penelitian ini untuk mengetahui pengaruh variasi kampuh terhadap uji ultrasonic dan uji kekuatan tarik hasil sambungan proses las Shielded Metal Arc Welding (SMAW) pada material stainless steel 304. Proses pengelasan dilakukan dengan menggunakan elektroda tipe NSN 312 AWS A5.4 E312-16 dengan menggunakan arus 100 A pada posisi pengelasan 1 G, pengelasan dilakukan pada material dengan menggunakan sudut kampuh V, I dan double V sebanyak 1 spesimen setiap kampuh. Hasil penelitian menunjukkan bahwa cacat pada hasil pengelasan dengan menggunakan sudut kampuh V lebih sedikit dibandingkan dengan pengelasan menggunakan sudut kampuh I dan double V. Selain itu, hasil pengujian tarik material stainless steel 304 menunjukkan nilai tegangan tertingi terjadi pada kampuh V yaitu sebesar 610,11 N/mm²  yang membuat material stainless steel 304 mengalami deformasi plastis. Hal tersebut membuktikan bahwa material stainless steel 304 yang dilas dengan mengunakan sudut kampuh V memiliki tegangan luluh lebih tinggi dibandingkan pengelasan dengan menggunakan sudut kampuh I dan double V. Kata Kunci : SMAW, ultrasonic Test, uji Tarik, elektroda, kampuh Effect of butt weld groove variations on stainless steel 304 by the SMAW welding using ultrasonic testing and tensile strength Abstract The strength of the weld joint is influenced by various factors that are very diverse, one of which is due to structural changes due to the heating process. In order for the connection between two metal parts to have good quality, precise welding is required and the connection and shape of the weld seam are in accordance with the use of the welded product. The parameters in SMAW welding include current strength, electric voltage, electric polarity, and groove used. These parameters make the basis for choosing the right one to get a good quality connection. The purpose of this study was to determine the effect of seam variations on the ultrasonic test and tensile strength test results of the Shielded Metal Arc Welding (SMAW) welding process on stainless steel 304 material. The welding process was carried out using NSN 312 AWS A5.4 E312-16 type electrodes using the current of 100 A at 1 G welding position, welding is carried out on the material using a groove V, I and double V for 1 specimen each seam. The results showed that the defects in the results of welding by using the angle of seam V is less than the welding using the angle of seam I and double V. In addition, the results of tensile testing of stainless steel material 304 showed the highest value of stress occurs in seam V that is equal to 610.11 N / mm² which makes stainless steel 304 material undergo plastic deformation. This proves that 304 stainless steel material welded using groove V has  higher yield stress than welding by using groove I and double V. 
Modification of polyurethane coating based on palm oil with filler bentonite to improve heat resistant properties Teuku Rihayat; Shafira Riskina; Adi Saputra Ismy
Jurnal POLIMESIN Vol 18, No 1 (2020): Februari
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v18i1.1655

Abstract

This work aims to prepare and characterize polyurethane nanocomposite sequences modified with bentonite as fillers and palm oil as a soft segment component while Toluene Diisocyanate (TDI) was chosen as a hard segment component. Bentonite fillers are needed to provide heat resistance to the polyurethane coating. Morphological, structural and thermal polyurethane nanocomposites are characterized by SEM, FTIR, and TGA. FTIR analysis is the NH urethane group in palm oil polyurethane compounds while the absorption of C=O urethane group widens at 1735 cm-1. While the CH group occurs at absorption wavelengths of 2120-2180 cm-1, adding bentonite (7% by weight) is completely laminated and well dispersed in the form of a mixture of peeling / intercalating layers in the polymer matrix. Polyurethane nanocomposites have a morphology separated by clearer microphase. The resulting thermal stability is higher compared to the addition of bentonite 3 and 5% by weight. Because of its enhanced features, the polymer developed can be considered a material with heat resistance as a coating.
Design of Onion Epidermis Peeling and Onion Smoothing Machine with Rubber Friction Method Application Fadwah Maghfurah; Riki Effendi; Mochammad Nurul Aini
Jurnal POLIMESIN Vol 18, No 1 (2020): Februari
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v18i1.1459

Abstract

Onions are the main ingredients for all types of cuisine so the level of demand is quite high. In the industrial world, a great number of processes of onion epidermis peeling are still using either manual and simple low capacity methods or high capacity machines with expensive components. Therefore, it is necessary to make a high capacity machine to peel the onion epidermis in a short time by using inexpensive and durable components that are designed with the help of Solidworks software. The onion epidermis peeling and smoothing machine uses a  0.5 HP electric motor power as a bond drive and  a rubber friction method for the process of peeling the onion epidermis. Besides, this machine is also designed to be compatible with peeling by connecting the rotation of the motor that is directly connected to the electric motor so that its design is simpler and does not require a long cycle of time. This peeling process is able to peel 2 kg of onion in 3 minutes and 0.5 kg for the refinement process in 5 minutes.
The effect of infill pattern, infill density, printing speed and temperature on the additive manufacturing process based on the FDM technology for the hook-shaped components Nguyen Huu Tho; Tong Cong Minh; Nguyen Phat Tai
Jurnal POLIMESIN Vol 18, No 1 (2020): Februari
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v18i1.1445

Abstract

The additive manufacturing technology based on the principle of material addition is an important technology in product design, manufacturing, and development. In addition, the trend in the recent future of this technology will be a major step to develop in the rapid manufacturing industry. Among the rapid prototyping technologies, the most popular FDM (fused deposition modeling) technology has been widely applied in the practice. The quality of rapid prototyping technology in general as well as FDM technology in particular mainly depends on the parameters in the prototyping and operational process. In this paper, the optimum parameters of the prototyping process based on the FDM technology are identified to improve the tensile strength of 3D printing products with PLA and PLA-copper materials. The parameters are chosen in the process of doing the experiments such as infill pattern, fill density, print speed, and print temperature. Then, based on Taguchi analysis technique, the experimental planning method is employed for design and optimization, with the support of Analysis of Variance (ANOVA) to evaluate and identify the influence of parameters on the tensile strength of the printed hook-shaped product. The results highlighted that the maximum tensile force of the sample is printed with PLA-Copper material with the optimum parameters is infill density of 75%, printing speed of 65 mm/s, and temperature of 185°C.
Pengaruh nilai oktan terhadap unjuk kerja motor bensin dan konsumsi bahan bakar dengan busi-koil standar-racing Riki Candra Putra; Ali Rosyidin
Jurnal POLIMESIN Vol 18, No 1 (2020): Februari
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v18i1.1490

Abstract

Banyak pengguna kendaraan menganggap jika angka oktan yang lebih tinggi dan penggunaan sistem pengapian racing dapat menjadikan performa kendaraan menjadi lebih baik. Namun, perlu kita lihat lebih teliti lagi dengan melakukan percobaan-percobaan pada alat dynamometer dan sepeda motor dengan menggunakan variasi angka oktan dan busi koil standar dan racing. Percobaan dilakukan terhadap 3 jenis bahan bakar dengan nilai bilangan oktan yaitu 88, 90 dan 92. Didapat nilai daya tertinggi pada pengujian bilangan oktan 92 dengan busi koil racing sebesar 6.753 kilo watt pada kecepatan putaran mesin 7762.6 rpm dan nilai torsi tertinggi pada pengujian bilangan oktan 92 busi koil racing sebesar 9.072 newton meter. Nilai daya maksimum terendah terjadi pada bilangan oktan 92 busi koil standar sebesar 6.601 kilo watt pada 7725 rpm dan torsi maksimum terendah pada bilangan oktan 88 busi koil standar yaitu sebesar 8.914 newton meter pada 4584.8 rpm. Nilai konsumsi bahan bakar spesifik tertinggi pada bilangan oktan 92 racing putaran 4000 rpm sebesar 0.116 Kg/kW.jam, nilai konsumsi bahan bakar spesifik terendah pada bilangan oktan 90 busi koil standar putaran 5000 rpm sebesar 0.08 Kg/kW.Jam, dan sesudah dilakukan uji hipotesis dengan metode independent T dengan SPSS pada putaran 2500 hingga 7500. Dapat disimpulkan bahwa perbedaan nilai daya dan torsi pada tiap-tiap bilangan oktan dan penggunaan busi-koil standar dan racing tidak memperlihatkan perbedaan yang signifikan.Kata kunci: Busi, koil, oktan, kinerja, torsiThe effect of octane value on the performance of gasoline motors and fuel consumption using standard-racing spark plugsAbstractMany vehicle users considered that a higher octane number and the used of a racing ignition system could make the vehicle's performance better, but we need to looked more carefully by conducted experiments on dynamometers and motorbikes using variations in the octane number and standard coil spark plugs and racing. Experiments were carried out on 3 types of fuel with octane number values of 88, 90 and 92. The highest power the value was obtained in octane number testing 92 with a racing coil spark plug of 6,753 kilowatts at rotating speed 7762.6  and the highest torque value occurred in the octane number 92 with spark plug racing coil at 9,072 newton meters. The lowest maximum power value occurred at 92 octane number with standard spark plugs of 6,601 kilo watts at rotating speed 7725 and the lowest maximum torque at 88 octane numbers with the standard coil plugs is 8,914 newton meters at rotating speed 4584.8. The highest specific fuel consumption value at octane number 92 with spark plug racing coil at rotating speed 4000 is 0.116 Kg/kW.hour and the lowest specific fuel consumption value is at octane number 90 with spark plug standard coil at rotating speed 5000 is 0.08 Kg/kW.hour, and after testing the hypothesis with the independent T method with SPSS on rotation 2500 to 7500, it is concluding that the difference in power and torque values for each octane number and the use of standard and racing spark plugs does not show significant differences.Keywords: Spark plug, coil, octane, performance, torque
Analisa pengaruh perlakuan kimia pada serat terhadap kekuatan impak charpy komposit serat sabut kelapa bermatriks epoxy Zulkifli Zulkifli; Ida Bagus Dharmawan; Wahyu Anhar
Jurnal POLIMESIN Vol 18, No 1 (2020): Februari
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v18i1.1583

Abstract

Penggunaan serat sabut kelapa pada material komposit akan menaikkan nilai komersial dari perkebunan kelapa. Kekuatan komposit berpenguat serat alam dipengaruhi oleh penyebaran serat, interaksi antara serat dengan matriks, bagaimana serat itu diperoleh, ukuran serat, dan bentuk serat. Untuk memperoleh ikatan yang baik antara matriks dan serat dilakuan modifikasi permukaan serat. Alkalisasi pada serat alam adalah metode yang telah digunakan untuk menghasilkan serat berkualitas tinggi. Penelitian ini menganalisis dan mengetahui pengaruh perlakuan kimia pada serat  terhadap kekuatan impak material komposit diperkuat serat sabut kelapa bermatriks epoxy. Adapun tahapan pada penelitian ini yaitu dilakukan perendaman serat sabut kelapa pada larutan NaOH dengan konsentrasi 10%, 15%, dan 20%, selama 2 jam, lalu serat dicuci dengan menggunakan larutan H2O2 dengan konsentrasi 3% selama 1 jam. Adapun hasil dari penelitian ini yaitu perlakuan alkalisasi terhadap komposit serat sabut kelapa mempengaruhi sifat kekuatan impak dari material komposit dengan kekuatan impak dan energi serap material komposit memiliki hubungan terbalik terhadap jumlah konsentrasi larutan alkalinya. Makin tinggi konsentrasi larutan alkalinya yang diberi pada serat akan menyebabkan makin kecilnya energi serap dan kekuatan impak dari material komposit berpenguat serat sabut kelapa.Kata kunci : komposit, serat sabut kelapa, NaOH, H2O2, kekuatan impak Effect of chemical treatment of composite coir fiber with epoxy matrix on the Charpy impact strengthAbstractThe use of coconut fiber in composite materials will increase the commercial value of coconut plantations. The strength of a natural fiber-reinforced composite is influenced by the spread of the fiber, the interaction between the fiber and the matrix, how the fiber is obtained, the size of the fiber, and the shape of the fiber. To obtain a good bond between the matrix and the fiber surface fibers are modified. Alkalization of natural fibers is a method that has been used to produce high-quality fiber. This study analyzes and examines the effect of chemical treatment on fiber on the impact strength of composite materials reinforced with epoxy coconut fiber coir fiber. The stages in this study were first carried out soaking coconut coir fiber in NaOH solution with a concentration of 10%, 15%, and 20%, for 2 hours, then the fiber was washed using H2O2 solution with a concentration of 3% for 1 hour. The results of this study are the alkalization treatment of coconut coir fiber composites affecting the impact strength properties of composite materials where the impact strength and absorption energy of composite materials have an inverse relationship to the amount of alkaline solution concentration. Where the higher the concentration of the alkaline solution given to the fiber will cause the smaller the absorbing energy and the impact strength of the composite fiber-reinforced coconut fiber.
Karakterisasi fisik dan kimiawi bentonite untuk membedakan natural sodium bentonite dengan sodium bentonite hasil aktivasi Cecep Ruskandi; Ari Siswanto; R Widodo
Jurnal POLIMESIN Vol 18, No 1 (2020): Februari
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v18i1.1596

Abstract

Bentonit adalah mineral yang cukup luas penggunaannya baik dalam bidang pertambangan maupun sebagai pengikat pasir cetak dalam bidang pengecoran logam. Secara alami bentonite ada dua jenis yaitu Na bentonite (swelling bentonite) dan Ca bentonite (non swelling bentonite). Melalui aktivasi menggunakan Na2CO3 terjadi pertukaran kation Ca oleh Na sehingga dihasilkan Na bentonite hasil aktivasi (activated Na bentonit). Penelitian ini dilakukan untuk menemukan karakteristik pembeda antara Na bentonite yang alami terhadap Na bentonite hasil aktivasi menggunakan berbagai metode karakterisasi yaitu XRD, SEM/EDS, pengujian indeks Swelling, titrasi, serta uji reaksi identifikasi. Na bentonite alami diberi kode sampel A, sedangkan Na bentonite hasil aktivasi diberi kode sampel AC. Hasil pengujian XRD menunjukkan bahwa pada bentonite alami tersusun atas senyawa montmorrilonit dan senyawa yang mengandung Al, Si dan O. Bentonite hasil aktivasi tersusun atas senyawa montmorrilonit dan kwarsa. Hasil pengujian SEM/EDS menunjukkan bahwa Na bentonite hasil aktivasi memiliki morfologi permukaan butiran yang lebih halus daripada bentonite alami. Na bentonite alami ternyata memiliki nilai indeks swelling lebih besar daripada Na bentonite hasil aktivasi. Indeks swelling Na bentonite alami berkisar antara 29 – 35 ml, sedangkan indeks swelling bentonite hasil aktivasi berkisar antara 15 – 22 ml. Hasil pengujian titrasi mengindikasikan bahwa pada Na bentonite hasil aktivasi mengandung anion CO32- lebih banyak berdasarkan volume asam HCl yang terpakai dalam titrasi yaitu 2-10 ml dibandingkan Na bentonite alami yaitu 0,5 – 1 ml. Reaksi identifikasi anion menunjukkan pada Na bentonite hasil aktivasi terjadi gelembung gas yang tidak ditemukan pada sampel Na bentonite alami.Kata kunci : Na bentonite, alami, aktivasi, morfologi, indeks swelling, gelembungPhysical and chemical characterization of bentonite to distinguish natural sodium bentonite from activated sodium bentoniteAbstrackBentonite is a mineral that widely used both in the mining sector and in the foundry industry as a molding sand binder. Naturally, there are two types of bentonite namely Na bentonite (swelling bentonite) and Ca bentonite (non swelling bentonite). Through activation using Na2CO3, Ca cation is exchanged by Na cation resulting in activated Na bentonite. The study was conducted to find the distinguishing characteristics between natural Na bentonite against activated Na bentonite using various characterization methods, namely XRD, SEM / EDS, Swelling index testing, titration, and identification reaction tests. Natural bentonite Na is designated  as sample A, while activated bentonite Na is designated as AC. XRD test results showed that the natural bentonite is composed of montmorrilonite compounds and other compounds containing Al, Si and O elements. while the activated bentonite is composed of montmorrilonite and quartz. SEM / EDS test results that activated Na bentonite has a finer surface morphology than that of natural bentonite. Natural Na bentonite appears to have a swelling index value greater than that value of activated Na bentonite. The swelling index of natural Na bentonite ranges from 29 to 35 ml while it is of  activated Na bentonite ranges from 15 to 22 ml. The result of titration test indicate that the activated Na bentonite contains more CO32- anions based on the volume of HCl acid used in the titration which is 2-10 ml compared to natural Na bentonite which is 0.5-1 ml. Anion identification reaction shows that gas bubbles appear in activated Na bentonite while it did not in natural Na bentonite sampel.
Analisis struktur komputasional pemadat sampah plastik menggunakan Autodesk Inventor Nur Indah; Illiyas Widantoro Hendrawan
Jurnal POLIMESIN Vol 18, No 1 (2020): Februari
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v18i1.1354

Abstract

Persoalan sampah menjadi permasalahan di indonesia, karena berkaitan dengan pola hidup serta budaya masyarakat itu sendiri. Olehnya penanggulangan sampah bukan hanya urusan pemerintah semata akan tetapi penanganannya membutuhkan partisipasi masyarakat secara luas. Dalam hal penanganan sampah dapat diasumsikan bahwa laju produksi sampah tidak sebanding dengan proses  penanganann. Penelitian ini merupakan salah satu solusi atas keinginan untuk melakukan peningkatan terhadap proses penanggulangan sampah  di Perguruan Tinggi Swasta Universitas Mercubuana Jakarta melalui mesin pemadat sampah plastik. Penelitian ini bertujuan untuk membuat perancangan mesin pemadat sampah plastik dengan sistem kerja otomatis menggunakan PLC. Perancangan mesin pemadat sampah plastik ini menggabungkan beberapa cabang ilmu mekanika dan elektronika; mesin pemindah bahan, mekanika struktur, analisis motor dan teknikal kontrol. Keunggulan mesin pemadat sampah plastik dengan sistem kerja otomatis menggunakan PLC ini adalah mengurangi mobilitas kerja manusia dan lebih menitik beratkan kepada kinerja dari rangkaian alat yang ada pada mesin. Berdasarkan nilai tegangan von mises, faktor pergeseran, dan faktor keamanan dari pengujian komputasional, dan analisis momen pada perhitungan analitik dapat disimpulkan bahwa desain yang telah dibuat berada pada kondisi aman. Dengan nilai tegangan von mises memiliki nila terbesar  30,78 Mpa. Pergeseran memiliki nilai terbesar 0,02311 mm. Faktor keamanan bernilai 15 pada seluruh objek uji.Kata kunci: Sampah Plastik, Mesin Pemadat Sampah Plastik Otomatis, Desain, Pengujian Komputasional Analysis of computational structure of plastic waste compactors using Autodesk Inventor AbstractWaste problem is a problem in Indonesia, because it is related to the lifestyle and culture of the community itself. Therefore, waste management is not only a matter of government but its handling requires broad community participation. In the case of handling waste, it can be assumed that the rate of waste production is not proportional to the handling process. This research is one of the solutions to the desire to improve the process of tackling waste at the Private University of Mercubuana University Jakarta through a plastic waste compactor machine. This study aims to make the design of plastic waste compactor machines with automatic work systems using PLC. The design of this plastic waste compacting machine combines several branches of mechanics and electronics; material moving machinery, structural mechanics, motor analysis and technical control. The advantages of plastic garbage compactor machines with automatic work systems using PLC are to reduce the mobility of human work and focus more on the performance of the existing set of tools on the machine. Based on the von mises stress value, the shift factor, and the safety factor from computational testing, and moment analysis in analytical calculations it can be concluded that the design that has been made is in a safe condition. With von mises voltage values the largest value is 30.78 MPa. The shift has the largest value of 0.02311 mm. The safety factor is 15 for all test objects.
Pengaruh kecepatan potong (Vc) terhadap kekasaran permukaan pada pembubutan kering baja ASTM A 29 menggunakan pahat karbida berlapis Titanium Aaluminium Nitrida (TiAlN) rudi salam; sunarto sunarto
Jurnal POLIMESIN Vol 18, No 1 (2020): Februari
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v18i1.1025

Abstract

Peningkatan kualitas produksi harus disertai dengan kualitas produk yang digunakan. Pada bidang permesinan kualitas permukaan suatu benda kerja dapat dipengaruhi oleh beberapa faktor seperti suhu pemotongan, kecepatan pemotongan, sudut pemotongan, kedalaman potong dan material yang digunakan dalam proses pembubutannya. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh variabel dan kondisi pemotongan terhadap hasil kekasaran permukaan pada proses pemesinan bubut. Penelitian ini dilakukan secara eksperimental menggunakan pahat karbida berlapis Titanium Alumunium Nitrida (TiAlN) pada pemotongan baja ASTM A 29 menggunakan cairan pemotongan dan tanpa menggunakan cairan pemotongan (Dry Machining). Pengukuran kekasaran dilakukan dengan terlebih dahulu menetapkan kondisi pemotongan dengan mesin bubut. Hasil yang didapat pada proses pembubutan kekasaran permukaan terendah berada pada nilai (µm) 1.535 dengan parameter kecepatan potong (Vc) 250 m/mnt, gerak makan (f) 0.1 mm/putaran, dan kedalaman potong (a) 1.5 mm dengan kondisi pemesinan basah, sedangkan kekasaran permukaan tertinggi berada pada nilai (µm) 2,077 dengan parameter kecepatan potong (Vc) 250 m/mnt, gerak makan (f) 0.1 mm/putaran, dan kedalaman potong (a) 1.5 mm dengan kondisi pemesinan kering. Dapat disimpulkan bahwa kekasaran permukaan terendah berada pada proses pemotongan basah menggunakan pahat karbida pada pemotongan material baja ASTM A 29 dengan (Vc) 250 m/mnt. Kata kunci : Kekasaran permukaan, pahat karbida, baja ASTM A 29, pemotongan kering, bubut Effect of cutting speed (Vc) on ASTM A 29 surface roughness by dry turning using a cutting tool as Aluminum Nitride Titanium coated titanium (TiAlN) Abstract Increasing the quality of the production must be accompanied by the quality of the product used. In the machining field, the surface quality of a workpiece can be influenced by several factors such as cutting temperature, cutting speed, cutting angle, cutting depth and the material used in the turning process. The purpose of this study was to determine the effect of variables and cutting conditions on the results of surface roughness in the lathe machining process. This research was carried out experimentally using a Titanium Aluminium Nitride (TiAlN) coated carbide tool on ASTM A 29 steel cutting using cutting fluid and without using cutting fluid (Dry Machining). Roughness measurement is done by first setting the cutting conditions with a lathe. The results obtained in the process of turning the lowest surface roughness are at a value (µm) 1.535 with cutting speed (Vc) parameters 250 m / min, feed motion (f) 0.1 mm /rotation, and depth of cut (a) 1.5 mm with wet machining conditions, while the highest surface roughness is at the value (µm) 2.077 with cutting speed (Vc) parameters 250 m / min, feed motion (f) 0.1 mm / rotation, and cutting depth (a) 1.5 mm with dry machining conditions. It can be concluded that the lowest surface roughness is in the wet cutting process using a carbide tool on cutting ASTM A 29 steel material with (Vc) 250 m / min.

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