Abstract: A new type of Vibration tapping machine deveploped the vibrator is a stepping motor. Under suitable vibration parameters the tappin torque is markedly smaller and the tap life is strikingly larger in the vibration tapping than those in the conventional tapping , so the difficult problem of titanium alloys tapping is solved. in this paper, basic cutting parameters are optimized with the tpping torque, the least number of brake pulse before the reversal of the stepping motor is computed theoretically and tested. Thus the teoretical basis for rationally apply the vibration tapping is provided.

Key words: vibration tapping, optimum parameters, brake pulse