A message is output when the degree of the wear position deviates from {HEAD ~ the degree} of the reference position by more than the degree of {TAIL ~ wear} permissible 
A message is output when the degree of the wear position deviates from { HEAD ~ the degree } of the reference position by more than the degree of { TAIL ~ wear } permissible
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH