In accordance with the invention, {TAIL ~ a conical grinding wheel} is mounted for {HEAD ~ rotation} about an axis extending at an acute angle to the direction of linear work advance and has helically extending grinding ribs thereon 
In accordance with the invention , { TAIL ~ a conical grinding wheel } is mounted for { HEAD ~ rotation } about an axis extending at an acute angle to the direction of linear work advance and has helically extending grinding ribs thereon
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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 OTH OTH