A main requirement in the field of polymer composites milling with fibre reinforcement is to machine with high quality in one operation (without delamination or burrs). That requires precise selection of cutting tool geometry and cutting conditions. Fibrereinforced plastics (FRPs) are difficult-to-machine materials due to high abrasivity, relatively low melting point of polymeric matrices and inclination to delamination or large burr formation. This study investigates the main factors influencing the forces, temperature and surface quality in terms of the cutting conditions through ANOVA testing. Machining during this experiment was performed with a polycrystalline diamond (PCD) end mill. Next, the strongest factor with various double-helix cutting tool geometry was compared. The geometric model of the cutting forces was created based on previous measurements as well as a general empirical model of cutting forces, temperature on the machined surface and average delamination length for C/PPS material.

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Grinding is one of the technologies for surface finishing of large scale of material. This paper deals with grinding of titanium alloy Ti6Al4V with silicon carbide grinding wheel. Ti6Al4V is the most widely used titanium alloy. Its utilization can be found in medical, aerospace, chemical and other industries. This experiment deals with evaluating of surface roughness after grinding. The roughness parameters (Ra, Rz) were measured on each specimen ten times. Also cutting forces were measured while grinding each specimen. All these measured values were evaluated and presentated in graphs.

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A number of machine parts are provided with design notches for the mounting of lock ring, position of bearing, and cross over sub of diameters etc. These elements significantly affect the durability of machines parts and their influence is inherently implemented into their design. The question is machining itself, particularly ambient surface finishing and intrinsic notch element. The changes and behaviour of machined surface form also very interesting part of paper and particularly under load. A number of new findings concerning the influence of machining on durability of machine parts both under dynamic load and the cyclic tensile, bending at rotation and torque were discovered in this research. The findings are important for further development, mainly related to car and aviation industries.