In other words, the cutter 24 is adjusted in proportion to {TAIL ~ the error} in {HEAD ~ a single step} 
In other words , the cutter 24 is adjusted in proportion to { TAIL ~ the error } in { HEAD ~ a single step }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD