A precision machining system for machining {HEAD ~ a workpiece} into a desired surface with {TAIL ~ two tool driving units} 
A precision machining system for machining { HEAD ~ a workpiece } into a desired surface with { TAIL ~ two tool driving units }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL