Step by step polishing directly from casting. It was not my favorite but very useful to know as a designer. After receiving casting from the casting company, The piece had spru that needed to clean with the big flat file and file the surface of the piece with the smaller file. And then used sandpaper to sand overall the piece. Next step was to polish the ring using the polishing machine and then cleaned it. The last picture was not the final finishing. To be continuing.