Pengaruh penggunaan nanofluida sebgai fluida pendingin pada proses pemesinan terhadap kekasaran permukaan hasil pemesinan dan analisanya terhadap temperatur pemotongan = Prototype development of a control system based on microcontroller for automatic cruise control test bed = The effect of using nanofluids as a cooling fluid at machining process to surface roughness and analysis of its effect to cutting temperature