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