Pengembangan mesin perkakas sangat dibutuhkan untuk menunjang dunia industri, saat ini BT-MEPPO-BPPT mengembangkan mesin perkakas khususnya mesin bubut CNC. Aspek penting dalam merancang mesin bubut salah satunya adalah perancangan struktur bed yang mampu menahan beban statis dari komponen mesin bubut yang lain. Struktur bed yang dikembangkan oleh BT-MEPPO adalah memodifikasi desain bed yang lebih ringan dan dimensi lebih optimal sehingga mengurangi biaya produksi namun tetap memenuhi standard. Proses perancangan dilakukan menggunakan metode riset development untuk membandingkan analisa struktur desain bed secara umum dengan modifikasi desain bed sehingga didapat kriteria statik berupa defleksi dan tegangan von mises untuk memastikan desain modifikasi aman untuk digunakan
The development of national machine tools needs special attention in order to compete with foreign products. Government agency cooperates with industry partners to develop precision CNC milling tools at competitive prices in today's manufacturing industry. One of the problems that often occur in the machine structure is the vibration caused by the resonance between the components that make up the machine, which results in inaccurate machining products. Therefore, it is necessary to do a natural frequency analysis on the milling machine prototype. This research was conducted on the base structure which is the most basic component as a holder for other components. Natural frequency analysis on the base structure uses two methods, namely experimental and numerical simulation using FEA. The results of the two methods are then compared and analyzed for errors that occur. Research parameter so that design does not resonate is that rotational velocity should be 15% above or below the natural frequency. The results show comparison natural frequency error value of numerical simulation method with experimental method and analysis of safety base design against resonance.
Keywords : base structure; natural frequency; experimental; simulation
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