A machine clamping device is a key tool in machining that enables precise clamping of the workpiece during various operations. This paper investigates the types of clamping devices and their characteristics. A modular clamping device was constructed and modeled in 3D. Also, the CAD model construction procedures were analyzed, the CAM technology of G-code generation was explained. Machining by milling and types of milling tools as well as machining parameters are described in detail. The machine grinding procedure and grinding parameters are described. The types of measurements and the importance of measurements in mechanical engineering are described. The impact of surface roughness on functionality, wear resistance and overall longevity of machine parts was also analyzed. In the experimental part, the greatest emphasis is placed on the technology of machining by milling with a detailed description of the entire process with the plan of processing, the plan of the tool and the creation of the program. After that, surface measurements were made using a comparator and a granite measuring table, and an additional visual check was carried out so that the workpiece could be prepared for grinding. The plan grinding process is described with the parameters used. After grinding, the workpiece was measured once more to check whether it meets the tolerance requirements. After that, the surface roughness was measured and the results were analyzed.