the GRINDER machine and how to use it

Mob grinders are by no means useless. I have a skeleton XP farm for XP (a mobevator), but sometimes you want to go AFK for a few hours but still collect massive amounts of loot in the interim. That is where a mob grinder comes in. You don't have to do
anything but stand in the same place until your inventory is filled. You can't do that with an XP farm since there is a limit on Xbox 360 to how many Mobs can exist in one location. After a certain point, no matter how long you wait at your XP farm, the
Mob count will not increase. With Mob grinders, you don't have to worry about the Mob count cap, because the Mobs are destroyed and the loot is automatically transferred to your inventory. Both XP farms and Mob grinders serve a separate purpose.

Sheesh. more meat grinders.

those mob grinder and wheat farm are useless... you don't get any xp and credit to the leaderboard.

there are better mob grinders see mob XP grinders.

for wheat really if you have a spawn trap xp grinder set up you get so many bones that you just need to set up a 9 block wheat farm and grow with bone meal harvest and make bread, i've got underground farms all over my mines so you never have to go up for
food.

You can also create smithing potions that will temporarily make your items better when you use the workbench (for armor) and the grinder (for weapons).

Meat grinder monkeys will always get more points.