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