Innovative optimization of feed and spindle speed levels for surface roughness and cylindricity tolerance of the drilled holes in liquid stir casted Al6061 hybrid composite reinforced with 15% weight fraction of SiC+Fly ash and comparing the above results. Journal of Pharmaceutical Negative Results [Internet]. 2022 Sep. 27 [cited 2026 Jun. 3];:413-27. Available from: https://www.pnrjournal.com/index.php/home/article/view/929