Also, an X axis drive system and {HEAD ~ a Y axis drive system} are provided for driving {TAIL ~ the tool holding unit} in the XY plane 
are provided for driving
Also , an X axis drive system and { HEAD ~ a Y axis drive system } are provided for driving { TAIL ~ the tool holding unit } in the XY plane
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH