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