said grinding wheel means being mounted for {HEAD ~ rotation} about {TAIL ~ an axis} which is inclined at an acute angle to and which diverges from the direction of movement of the stock 
about
said grinding wheel means being mounted for { HEAD ~ rotation } about { TAIL ~ an axis } which is inclined at an acute angle to and which diverges from the direction of movement of the stock
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH