The process of shot casting generates remains (curls) caused by the division among tools that affect the final quality of the manufactured product. After this process is necessary to continue with a trimming that eliminates these previously generated remains. So, we use a robotized arm with visual sensors that makes the suitable treatment for the different tools in production possible. The process of automated trimming needs, at first, a prior knowledge of the three-dimensional model of the product. From the database of CAD models used in the design, it is possible to generate the trajectories to be carried out by the tool machine. This one is in the robot arm’s extreme, the movement from which is continuously feed-back by the visual information provided by the sensors. So, we can make little movements on the planned trajectories, to assure a permanent contact between the tool and the piece to trim. What is more, the visual feed-back lets also detect situations in which the curl is not completely eliminated and, therefore, it is necessary a second row of the tool.