Preferably, {HEAD ~ a numerical control unit} for controlling {TAIL ~ the grinding machine} is programmed in the following manner 
Preferably , { HEAD ~ a numerical control unit } for controlling { TAIL ~ the grinding machine } is programmed in the following manner
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH