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