AbstractThe paper discusses the equipment and method for measuring vibrations in the tool-workpiece system during face milling. The experimental results show that the vibrations in the tool-workpiece system are dependent on the feed rate. The relationships between vibrations and time, as well as the standard deviation of the displacements and feed are presented graphically. The tests conducted on an AVIA VMC-800 with a built-in measuring system involved milling C45 steel samples with a Sandvik Coromant CoroMill 490 cutter. The process of surface roughness formation in face milling with a CoroMill 390 is difficult to define, as there are a number of factors to be taken into consideration. The work analyzes the influence of the vibrations in the tool-workpiece system on surface roughness. The simulations were conducted basing on the mathematical model for predicting surface roughness discussed in Ref. [1].