acme offers a complete line of wet or dry centerless grinding machinery for performing a variety of operations ranging from tolerance grinding to decorative finishing on the outside diameter of tube, pipe, rod and bar. ac......acme offers a complete line of wet or dry centerless grinding machinery for performing a variety of operations ranging from tolerance grinding to decorative finishing on the outside diameter of tube, pipe, rod and bar. acme centerless systems can utilize coated abrasive belts, abrasive flap wheels, non-woven abrasive wheels, buffing wheels, nylon and wire brushes.