Tutorial:Mob grinder

Mob grinders are the final part of an automatic mob farm: the mob killing mechanism. Mob grinders can be used to kill many mobs while simultaneously collecting all dropped items at a convenient location.

Most mob grinders are specific to certain categories of mobs. Some grinders work only with tall mobs such as skeletons, zombies, and creepers, but don't work with shorter mobs such as spiders, pigs, and baby mobs. Other grinders work with both tall and short mobs, but don't work with mobs which are immune to fire damage.

Most of these mob grinders do not produce music discs or other rare drops as the mob deaths do not meet certain conditions. It is possible to build most grinders in such a way that it would be easy to fulfill these conditions, however. Regardless, the mobs drop experience only if killed by the player, not by automated means.