A first drive unit moves the tool along at least two axes to shape {TAIL ~ the workpiece} similar to {HEAD ~ a desired surface} 
A first drive unit moves the tool along at least two axes to shape { TAIL ~ the workpiece } similar to { HEAD ~ a desired surface }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD