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PENGARUH VARIASI MATRAS KARET TERHADAP KERATAAN PERMUKAAN PELAT PADA ALAT CEKAM VACUUM CLAMPING Karnova Yanel; Herianto Herianto; R. Rachmat A Sriwijaya
Jurnal Momentum ISSN 1693-752X Vol 19, No 2 (2017): Volume 19 No. 2 Agustus 2017
Publisher : ITP Press

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Sebuah mesin milling digunakan dalam proses permesinan untuk pekerjaan pemakanan permukaan, sisi, dan pemotongan material dengan profil tertentu (Rochim, 1993). Alat bantu cekam vacuum clamp yang dipilih dapat digunakan untuk memotong profil yang berbeda-beda. Agar benda kerja tercekam dengan sempurna maka permukaan alat cekam dilapisi dengan matras karet sebagai perapat.Tujuan dari penelitian ini untuk melihat pengaruh matras karet terhadap kerataan permukaan pelat yang dicekam menggunakan vacuum clamping. Spesifikasi vacuum clamping yang digunakan adalah 280 mm x 180 mm x 35 mm (p x l x t) dengan area cekam 200 mm x 150 mm (p x l), lubang diameter 3 mm, jarak antar lubang 5 mm yang berfungsi sebagai tempat benda kerja dicekam (dengan alas matras karet). Pompa vacuum menggunakan spesifikasi rotary vane vacuum pump, daya 1/3 hp atau 0,25 kW. Alas matras karet menggunakan matras karet yang banyak dijumpai di pasaran dengan ketebalan 1,7 mm dan 3,5 mm.Tekanan hisap yang digunakan -24 InchHg(Yanel, 2016). Proses pengukuran menggunakan dial indicator yang dipasangkan pada alat ukur ketinggian pada meja kerataan.Dari penelitian yang dilakukan dapat dilihat bahwa perbedaan ketinggian permukaan pelat yang dicekam menggunakan vacuum clamping untuk matras karet 3,5 mm adalah 0,9 mm sedangkan untuk matras karet 1,7 mm adalah 0,56 mm.Keyword: Vacuum Clamping, Active Clamping, Milling Fixture.

Effect of Oil on the Electrodes of the Low-Carbon Steel Welding Using DCSP Polarity in Terms of Microstructure Hafni Hafni; Karnova Yanel
Jurnal Teknik Mesin (JTM) Vol 8, No 1 (2018)
Publisher : LP2M - Institut Teknologi Padang

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The flaws or failures that occur in the welding results can be caused by many things, one caused by the quality of the electrode. The quality of the electrode may be affected by moisture caused by water or oil, thereby damaging the flux lining the electrode. To know how big influence of oil on electrode to result of welding of low carbon steel hence conducted a research by using oil as element of elektrodanya moisturizer. The humidity of the electrode is carried out by immersing the electrodes into the SAE 40 oil oil until it reaches the absorption of 5% by weight of the electrode. Welding process is then performed on low carbon steel plate with DCSP polarity.The result of welding is metallographic testing to observe macrostructure and microstructure of welding area and base metal. From the test results obtained that the moisture of electrodes by oil cause defects in the weld metal region on the low carbon steel welding results.

Design of Coconut Paring Machine Karnova Yanel
Jurnal Teknik Mesin (JTM) Vol 8, No 1 (2018)
Publisher : LP2M - Institut Teknologi Padang

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Coconut plant is a very useful natural resource for human life. One of the benefits of coconut plant is coconut is a raw material that can be processed fresh drinks. In general, the process of peeling coconut still using the manual process so it takes a lot of energy, a long time, and a sharp tool to peel the coconut, to overcome this need a design of a more efficient young coconut peeler, this machine is designed using cheaper materials so that can be reached by all people especially who have business of coconut sales. Coconut peeler is a working principle of rotary system, the coconut to be peeled is placed on top made specifically for the coconut holder and to ensure the coconut does not fall during peeling process, the coconut is retained using a lever that serves as a lock. The driving force used is the electric motor, power on the electric motor will be forwarded from the pully motor rotation through v-belt to the pulley driven. From this research has been obtained model of machine design to peel coconut coir, coconut coir peel machine which is designed can peel coconut husk within 2 minutes for 1 coconut, with the highest efficiency value which is worth 93.5%

Modification of Hand Molding Flower Vase for Thermo Plastic Recycling Karnova Yanel
Jurnal Teknik Mesin Vol 11 No 1 (2021): Jurnal Teknik Mesin Vol.11 No.1 April 2021
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Broadly speaking, plastics can be grouped into two groups, namely: thermoplast plastics and thermoset plastics. Thermoplast plastics are plastics that can be repeatedly printed in the presence of heat. Thermoplast plastics include: PE (Polyethilene), PP (Polypropylene), PS (Polystirene), ABS (Abutile Butadine Styrene), Nylon, PET (Polyethilene Terephthalete), POM (Polyacetal), PC (Polycarbonate) etc. Meanwhile, thermoset plastic is plastic which, if it has undergone certain conditions, cannot be reprinted because the polymer structure is in the form of a three-dimensional network. In making flower vases using hand molding tools, there are still shortcomings, such as during the melting process of plastic material, the heat given by the oil stove has not yet maximally spread the heat to the mold which causes the results to be not optimal. Besides, the heat given by the oil stove is not yet known by the operator. , because in the manufacture of flower vases have not used a controller to determine the temperature in the hand molding tool, the old mold results in the cylinder cannot be used for tensile testing. Therefore it is necessary to modify the hand molding tool. Based on the results of testing the tools that have been done, the following conclusions can be drawn: The product has a height of 16 cm, a thickness of 4 mm, a hand-molding tool can be a solution for reducing waste in the environment, plastic can be formed into a product that is valuable by processing it according to the temperature.

Design of Coconut Paring Machine Karnova Yanel
Jurnal Teknik Mesin Vol 8 No 1 (2018): Jurnal Teknik Mesin Vol.8 No.1 April 2018
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtm.2018.v8.i1.39-44

Coconut plant is a very useful natural resource for human life. One of the benefits of coconut plant is coconut is a raw material that can be processed fresh drinks. In general, the process of peeling coconut still using the manual process so it takes a lot of energy, a long time, and a sharp tool to peel the coconut, to overcome this need a design of a more efficient young coconut peeler, this machine is designed using cheaper materials so that can be reached by all people especially who have business of coconut sales. Coconut peeler is a working principle of rotary system, the coconut to be peeled is placed on top made specifically for the coconut holder and to ensure the coconut does not fall during peeling process, the coconut is retained using a lever that serves as a lock. The driving force used is the electric motor, power on the electric motor will be forwarded from the pully motor rotation through v-belt to the pulley driven. From this research has been obtained model of machine design to peel coconut coir, coconut coir peel machine which is designed can peel coconut husk within 2 minutes for 1 coconut, with the highest efficiency value which is worth 93.5%.

Failure Analysis of a Heat Exchanger 212-E9 Dedi Wardianto; Karnova Yanel; Asmara Yanto
Jurnal Teknik Mesin Vol 11 No 2 (2021): Jurnal Teknik Mesin Vol.11 No.2 October 2021
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtm.2021.v11.i2.124-131

Heat Exchanger 212-E9 is one part of the working fluid Debutanizer unit with seawater on inner tubes and H2S on the outside of the tubes. These tubes have failed in the form of leakage. Here the analysis of leakage and the remaining life of the tubes are based on data from the inspection and analysis of general corrosion of the tubes. Part inlet tube erosion-corrosion as well as there are some leaks in the tubes. From the results of inspections in the field, erosion-corrosion of the inlet tube caused by the flow of seawater on the inlet tube containing a solution/coarse material. While the leakage that occurs in tubes due to the H2S concentration is too high, which is equal to 2 mol % H2S. In fact, the recommended H2S concentration is 0.32 mol % H2S. The high level of concentration of H2S is not suitable with the level of material resistance tubes. In the analysis of remaining life obtained maximum corrosion rate in the tubes of 0.2372 mm/year. With the usage time now is 6 year obtained remaining life of 2.5 year again. Referring to the results of the analysis of leakage and remaining life on the tubes is recommended that a filtering of the seawater before entering into the tubes and provide tubes protector on the inlet tube so that tubes are protected from erosion-corrosion, and which is necessary to regulate the level of concentration of H2S Heat Exchanger flowing at the recommended standards.

Design and Manufacturing of Wind Tunnel for Turbine Impeller Airfoil Testing Karnova Yanel; Asmara Yanto
Jurnal Teknik Mesin Vol 12 No 2 (2022): Jurnal Teknik Mesin Vol.12 No.2 October 2022
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtm.2022.v12.i2.124-130

In this study, the design of a wind tunnel was carried out to observe airflow through an airfoil, streamlines and turbine blades. To accommodate this, in this study a design was made of an open return wind tunnel. In this case, an open circuit wind tunnel type will be made because the construction is simpler and the manufacturing costs are relatively cheaper compared to the closed circuit wind tunnel type. The Wind Tunnel is designed with Open CLosed Wind Tunnel (OCWT) type. The OCWT is designed to consist of fan and housing, diffuser, test section, contraction, honeycomb. The OCWT design uses an operating fan to circulate air into the test section. The maximum air speed in the Test Section is 5 m/s with a flow that is closed to laminar. The recommended diffuser has a dimension of 50 cm on the side that is attached to the test section and 52 cm on the side facing the fan with an inclination angle of 1.79o. The driver uses a 16 inch exhaust fan with a power of 74 W to make the flow in the Test Section stable at a speed of 2 m/s.

Stress Analysis of Elevator Chain Pin in PT. Semen Padang Rozi Saferi; Karnova Yanel; Hamdani Akmal
Jurnal Teknik Mesin Vol 13 No 2 (2023): Jurnal Teknik Mesin Vol.13 No.2 October 2023
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtm.2023.v13.i2.42-48

The chain pin on the elevator chain is the most important component in the chain in transmission system which function as an axle on the chain. Chain pin is the part that is in direct contact with the sprocket teeth. This analysis aims to determine the stress that occurs in the chain pin by calculating the stress and using the autodesk inventor software. Data collection is done by measuring the dimensions of the elevator chain, the calculating the chain pin analysis using equation according to theory and using autodesk inventor for better analysis result. The result of the stress analysis on the chain pin with a diameter of 23 mm are 16.93 MPa while the result of the analysis using autodesk inventor software are 1.43 MPa. So that the stress resulting from the two analysis does not exceed the maximum allowable stress of 568.78 MPa.

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