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