CHANGED THE BORING TOOL DUE TO CHATTERING.|WHILE PERFORMING BORING OPERATION CHATTERING OCCURRED.|INSTEAD OF PUTTING LEFT HAND TOOL,RIGHT HAND TOOL WAS INSTEAD.|SPINDLE ROTATION HAD TO BEEN ALTERED ,BUT IT WAS NOT DONE.|DUE TO WRONG ROTATION OF THE SPINDLE THE PART CAME OUT OF THE JAWS AS THE PRESSURE OF JAWS WAS SET LESS.