The application of industrial robots in machining processes is attracting more and more attention. Compared to machine tools, industrial robots offer higher flexibility and lower investment costs; however, their lack of stiffness is the main obstacle to achieving tight tolerances and high-quality machined surfaces. In addition, the stiffness of the robot is not a constant value, but varies in its working space and depends on the posture of the robot itself, which makes its application even more challenging. Therefore, as part of this thesis, an experiment was conducted to determine the influence of the robot stiffness on the texture of the milled surface. Robotic machining was performed at two different clamping positions, that is, two identical test samples were machined at different locations within the robot's workspace (one closer to the robot base and the other further away from the robot base). This thesis also describes the activities that preceded robotic machining (from the design of the technological process to machining simulations). According to the results obtained from the surface texture analysis, higher values of the roughness parameters were observed on the workpiece that was further away from the base of the robot and machined with an extended robot arm. It was found that machining with reduced stiffness of the robotic arm in an extended position negatively affected the quality of the machined surface.