Chevron groove grindingSep 9, 2015 . CNC grinding of a chevron groove pattern on a drum pulley. Grooves in the rubber covering aid in conveyor belt traction. The CNC makes one pass to produce th.roller groove pass grinder,Practical Roll Techniques - Grinding & Balancing - ValmetThis paper provides practical tips on roll inspections, balancing, grinding and grooving. In addition, we discuss proper . The correct way to measure concentricity on a grinding machine is 180º from wheel (back side), if the roll is supported on .. .005" and finishing passes should be reduced to .002". Key points. • Roll must.