This paper has identified the best parameter setting in obtaining the best machining of rubberized fly ash-geopolymer materials concerning the surface roughness quality. A cylindrical shape of fly ash geopolymer with 150 mm x 52 mm used in this experiment were prepared and machined. Rubberized fly ash geopolymer is formed from a combination of geopolymer and crumb rubber. Fly ash is selected as geopolymer while crumb rubber is from waste tires rubber. The lathe operation is performed using a CNC lathe machine. Taguchi method will be used to optimize the selected parameter, which is cutting speed, feed rate and depth of cut. The confirmation test is conducted to determine the validation. The results show that the most significant parameter that influenced machining on geopolymers are cutting speed 48.17% and followed by a feed rate of 44.95% and depth of cut 1.23%. The best combination parameter has also been suggested from the experiments. The result shows the rubberized fly ash geopolymer has potential to be machined and can be used for many engineering applications.
