This study presents the effects of thermal-assisted machining on the suppression of vibrations during end milling of titanium alloys Ti-6A1-4V using PCD inserts. The effects of heating temperature on suppression of vibrations were investigated. Induction coil heating was utilized to generate heat close to the cutting zone prior to cutting. One room temperature and three preheated conditions with same cutting speed, feed and axial depth of cut were chosen in order to investigate the effects of preheating temperature on amplitude of the vibrations. Vibration signals were recorded using an accelerometer type transducer and a Dual Channel Portable Signal Analyzer. The recorded signals were analyzed using the PULSE Labshop software. The reductions of the peak values were systematically calculated and the effects of preheating temperature on the amplitudes were plotted in block diagram. The effect of thermal-assisted machining on the chip formations was also investigated. © 2012 Asian Network for Scientific Information.