Accurate: Journal of Mechanical Engineering and Science

ANALYSIS OF COMPETENCY NEEDS FOR LATHE MACHINE OPERATORS IN THE MEDIUM-SCALE MANUFACTURING INDUSTRY IN THE CITY OF SERANG

Ardhika Achmad Gustama dika — 2024-12-02

Lathe operator competence is needed in every manufacturing industry, especially in the field of turning. Currently, employment in Indonesia, especially in the manufacturing industry, has increased from year to year, so it is necessary to identify the work and tasks of a lathe operator. This study aims to (1) identify the work and (2) tasks of lathe operators in the medium scale manufacturing industry. The method used in this research is the descriptive qualitative method. The object of this research is a lathe operator from a medium sized manufacturing industry in Serang city, Indonesia. For data collection, this study used observational studies. The data analisys technique used was descriptive analysis and Dacum Research Chart which was validated by Expert Judgement. This study successfully identified (1) Five types of work and (2) Twenty-two tasks performed by a lathe operator in a medium-scale manufacturing industry with sixteen knowledge and skills as well as eight attitudes that must be possessed by a lathe operator and as many as forty-one machines and supporting tools whose operation must be controlled by a lathe operator in a medium-scale manufacturing industry.

RANCANG BANGUN PEMBUATAN MESIN PENCACAH SAMPAH PLASTIK MINIMALIS

Erlina Prasetyawati — 2024-12-02

A plastic waste shredder is a tool used to shred or crush plastic into small pieces using a cutting knife mounted on a shaft connected via a pulley and belt transmission to a motor. This study is an experimental study to design a waste shredder with a more minimalist design that uses a 1000 RPM washing machine dryer dynamo drive motor, but aims to be able to participate in overcoming the current plastic waste problem. The results of the study showed that this machine with a 1000 RPM washing machine dynamo drive motor can only crush PET plastic beverage bottle waste that must be cut into pieces first to avoid stopping the machine and slipping material. Based on these results, it can be concluded that this machine is only intended for shredding thin PET plastic bottles.

PERANCANGAN DAN UJI FUNGSI SISTEM PEMBERSIH KANDANG SAPI TIPE PENGIKIS LANTAI MENGGUNAKAN SOROK MEKANIK

Ipung Kurniawan — 2024-12-02

The floor scrapping method for cowshed cleaning systems has been widely applied on several modern farms today with the aim of making it easier for farmers to clean the cowshed. The mechanical design of the motor-driven scraper aims to facilitate the cowshed and save human energy. The design method uses James H. Earle method and is continued by carrying out the production process for the cowshed cleaning systems. This system works using a chain to pull the scraper so that it moves to scrape dirt on the floor by pushing it, so that work that was previously done manually can be done more easily with the help of this tool. The designed tool has dimensions of 1000 mm x 500 mm x 300 mm, while the mechanical beam design has dimensions of 700 mm x 200 mm x 3 mm. Based on the calculation results, bending stress data was obtained of 20.534 N/mm² for the frame and 41.476 N/mm² for the scraper. Calculation of the transmission system for the cowshed cleaning tool obtained specifications for an electric motor with a power of 0.02 HP, a pulley measuring 72.6 mm, a belt measuring 26 inches, a shaft measuring 12 mm and rolling bearings with a life of 24 years. Then, from the result of testing the frame and scraper using Solidwork software, it was found that the stress was 29.95 MPa for the frame and 67.49 MPa for the scraper. This stress value is declared safe because it is still below the permitted stress. Meanwhile, based on function testing, the most effective nozzle to use is a nozzle with an angle of 15^o because it has a higher spray intensity than the others and thus has the highest cleanliness value. Based on test results, the cowshed cleaning tool obtained an average cleanliness score of 75.6 with a time of 60 seconds.

PERANCANGAN TRANSMISI MESIN PEMBUAT PAGAR KAWAT HARMONIKA

Adytia Putra Pratama — 2024-12-02

Zig-zag wire or what is usually caleed harmonica wire can be used to make fences. Making harmonica wire is doen by bending the wire into a zig-zag shape. The process of making harmonica wire fences can be used as a home industry production. Therefore, the aim of this research is to design the transmission components of the harmonica wire fence making machine by calculating the machine elements in the transmission. The research method uses the VDI 2222 method approach. The design results are in the form of a harmonica wire fence making machine. The results of calculating the machine elements on the harmonica wire fence making machine have results including the transmission pulley used, namely type A with sizes 4 inches and 14 inches, the v-belt used is type A belt with a belt circumference length of 76 inches. Meanwhile, the diameter of the shaft used in the harmonica wire fence making machine is 25 mm with S45C material and the estimated force required in bending the the wire is 7.27 N.

APLIKASI CVT PADA SEPEDA MOTOR LISTRIK (SEMOLI) GENERASI 2

Bayu Aji Girawan — 2024-12-02

The trend of using electric motorbikes to drive two-wheeled vehicles in Indonesia has started to increase. This is because the increasing public awareness of the benefits of electric vehicles is linked to the decreasing fossil energy reserves. Apart from that, electric vehicles are an environmentally friendly means of transportation because they do not cause air pollution. Based on previously research SEMOLI Generation 1, it is known that the use of a sprocket and chain transmission model on electric motorbikes produces less than optimal performance when used on flat roads, because on flat roads there is no need for large torque. The aim of this SEMOLI Generation 2 research is to conduct experiments using a CVT transmission which is predicted to be able to provide large torque when the road conditions are uphill, and able to provide higher speeds when the road conditions are flat. The research stages carried out successively are: conducting studies, selecting transmissions, assembling, fabricating, designing frames and swing arms, testing, and preparing documents. Based on the test results, it was found that using a CVT was able to increase maximum speed on both horizontal and uphill road conditions. This increase is because CVT has a wide transmission comparison range, so it is able to overcome uphill and horizontal road conditions.