Abstract
The purpose of this research is to see the effect of slope of incision angle chisel through Tool Post to roughness of surface of object. The method used is a lathe ST 37, with 0.5 mm cutting depth, with side angle cutting angle by tilting the Post Tool, ie: 10˚ tilted to the left, 10˚ tilted right, 0˚ (perpendicular), 5˚ tilted right, and 5˚ tilted left. Feeding (constant feeding) is: 0.281 mm / rotation, main cutting corner of chisel 80˚ and cutting speed = 740 rpm. Then the workpiece measured the surface roughness by using Surface Tester Mitutoyo SJ-201P. The result showed that, the smallest surface roughness rate achieved was (ΣRap) = 7, 42 μm with N9 surface roughness class with the Post Tool angle 5 ° to the left. While the largest surface roughness rate achieved is (ΣRap) = 13, 76 μm with the surface roughness class N11 with the tool angle post 10 ° to the right. The value of the roughness level achieved is between N9 - N11.
Highlights
The purpose of this research is to see the effect of slope of incision angle chisel through Tool Post to roughness of surface of object
Terjadinya perbedaan nilai kekasaran dari ketiga spesimen dalam satu sudut Tool Post, ini dikarenakan kurangnya ketepatanan mesin dalam proses pembubutan benda kerja, proses pembubutan tidak menggunakan cairan pendingin sehingga pahat cepat panas dan mudah tumpul, serta pengasahan pahat tidak tepat ini dikarenakan dalam proses pengasahan pahat menggunakan manual
[5] Sugiyono, Metode Penelitian Pendidikan (Pendekatan Kuantitatif, Kualitatif dan R&D), Bandung: Alfabeta, 2012
Summary
Penelitian ini merupakan penelitian eksperimen yang membandingkan tingkat kekasaran permukaan baja ST 37 hasil pembubutan dengan memvariasikan sudut sayat melalui Tool Post [5]. Metode penelitian yang digunakan untuk mencari pengaruh sudut sayat dengan mengubah Tool Post terhadap kekasaran permukaan pada pembubutan benda kerja ST 37. Untuk mengukur pengaruh sudut Tool Post terhadap kekasaran permukaan benda menggunakan Surface Tester Mitutoyo SJ-201P dan hasil pengujian diperoleh melalui percobaan langsung terhadap benda uji. Data pengujian diperoleh melalui hasil uji kekasaran permukaan benda uji. Objek yang akan diteliti yaitu baja karbon rendah ST 37 dengan pembubutan menggunakan pahat HSS dengan memvariasikan sudut sayat melalui Tool Post
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