Aluminium and aluminium alloy are metal of high plasticity and low fusion temperature. When processing this kind of materials at conventi onal machines, the cutting force is not strong, processing productivity is high, phenomena at cutting place is as similar as processing steel. However, because of stated characteristics, some phenomena with level and frequency are much different from other metal. This affects on surface quality after processing. Research results which are stated in this article about the relationship between cutting condition (v, s, t) and surface roughness after milling on CNC milling machine are basis for the selection of cutting parameters when processing by 6061 aluminium alloy
