TO CONTROL THE UNIFORMITY OF THE AWJ PENETRATION INTO THE WORKPIECE IT IS NECESSARY TO DEVISE A SENSING SYSTEM THAT CAN ON-LINE SENSE THE DEPTH OF AWJ PENETRATION. IT WAS SHOWN THAT THE WORKPIECE NORMAL FORCE GENERATED BY AN ABRASIVE WATERJET COULD BE USED AS THE INDICATOR OF THE DEPTH OF JET PENETRATION, AND THAT A FORCE-FEEDBACK CONTROL HOLDS PROMISE AS AN EFFECTIVE WAY TO REGULATE THE DEPTH OF JET PENETRATION.
