Found a bug with the SMP version.. If you create a diamond gear you get a rotary macerator after removing the diamond gear. Tested it multiple times in multiple ways, works in SMP but not in single player. Im running the Craft bukkit 3.2 version using IC2 and BC plus other mods from
http://www.mcportcentral.co.za/index.php?topic=1037.0 site..