In a preferred embodiment, the frame emulates a workpiece cassette and the distance sensors provide {HEAD ~ a numerical output} of {TAIL ~ the distance} to the workpiece 
of
In a preferred embodiment , the frame emulates a workpiece cassette and the distance sensors provide { HEAD ~ a numerical output } of { TAIL ~ the distance } to the workpiece
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH