SPECIAL CENTRELESS GRINDING MACHINE SUITABLE FOR THE FINISHING OF THE GROOVES AND THE CHAMFERS AT THE POPPET VALVE STEM END Typical components to be centreless ground: stem dia. from a solid bar from 5 to 8 mm - head dia. from 20 to 45 mm Plunge grinding floor-to-floor cycle time: 4 seconds with automatic grinding wheel dressing during full production