Original scientific paper The paper deals with the indirect ways of on-line monitoring of technological processes of cutting. The objective of the study is a design of on-line monitoring system for the cutting technology through an abrasive water jet. In cutting by the abrasive water jet two parallel phenomena are formed. The phenomena are represented by generated surface and vibrations. For the purpose of proving of the hypothetical assumptions on dependence of generated surface quality on vibrations the experiments utilizing stainless steel AISI 304 were performed. The experiments were realized at four diverse settings of cutting head traverse speed. The material vibrations were collected by means of two independent accelerometers PCB IMI 607 A11. One of the accelerometers was oriented towards the cutting direction and the other in direction perpendicular to cutting. Sampling frequency was of 30 kHz. The generated topography of the material was measured by an optical profilometer FRT MicroProf. The collected data were evaluated by a virtual tool developed in LabView 8.5 in the form of vibration analyses being consequently mutually compared. Both phenomena proved to be dependent on common technological cause, i.e. on cutting head traverse speed. At the same time the study offers a theoretical design of the on-line monitoring system and of the future heading of the research in this field. Keywords: abrasive water jet; monitoring, on-line; vibrations On-line praćenje tehnološkog postupka rezanja materijala abrazivnim vodenim mlazomIzvorni znanstveni članak Rad se bavi indirektnim načinima on-line praćenja tehnoloških postupaka rezanja u svrhu projektiranja on-line sustava praćenja primjenom tehnologije rezanja abrazivnim vodenim mlazom. Rezanjem abrazivnim vodenim mlazom javljaju se dva fenomena, a to su generirana površina i vibracije. U svrhu dokazivanja hipotetske pretpostavke ovisnosti kvalitete generirane površine o vibracijama, provedeni su eksperimenti s nehrđajućim čelikom AISI 304 s četiri različita podešavanja brzine prijelaza rezne glave. Vibracije materijala su se pratile pomoću dva odvojena akcelerometra PCB IMI 607 A11. Jedan je bio orijentiran na smjer rezanja, a drugi na pravac okomit na rezanje. Učestalost uzimanja uzorka bila je 30 kHz. Dobivena topografija materijala mjerena je optičkim profilometrom FRT MicroProf. Dobiveni su se rezultati proračunavali virtualnim alatom razvijenim u in LabView 8.5 u obliku analiza vibracija koje su se stalno međusobno uspoređivale. Pokazalo se da obadva fenomena ovise o zajedničkom tehnološkom razlogu, t.j. brzini prijelaza rezne glave. U isto vrijeme u radu se daje teoretski projekt on-line sustava praćenja i smjer budućeg istraživanja u ovom području.