For effective transporting away of {HEAD ~ chips}, the main flute and {TAIL ~ the reamer flutes} preferably have the same helix orientation 
For effective transporting away of { HEAD ~ chips } , the main flute and { TAIL ~ the reamer flutes } preferably have the same helix orientation
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH