{TAIL ~ A measuring unit} measures the tool position with {HEAD ~ an accuracy} higher than that to which the first drive unit can respond 
{ TAIL ~ A measuring unit } measures the tool position with { HEAD ~ an accuracy } higher than that to which the first drive unit can respond
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH