Overview in PDF format - Tallinna Tehnikaülikool

Figure 2.1 Use of modelling in production planning systemMachine-tool vibrations were evaluated using a modal analyser. Vibrations levelclassification by ISO 2372 was used for evaluation the current system. In Fig. 2.2,a snapshot of turning is shown. At 50 Hz the vibrations are caused by an electricalset, the highest result 2.2 mm/s 2 can be evaluated as unsatisfactory and the systemhas to be alarmed. Human intervention in this case is required at the decision level(perception of further details of operation and emergency actions).Figure 2.2 Vibrations on CNC latheThat a worn tool causes different noise is known by all CNC machine tooloperators. In Fig. 2.3 the difference between machining with an unworn (lower line)and a worn cutting tool is shown.17