I made this wool farm from three different wool farms I have seen and incorporated them into this design. This farm is for games or servers where when the sheep eat the grass from the block the block turns into a dirt block. (If the grass block does not change to a dirt block when the sheep eat from it see "Wool Farm Without Grass Block Changer" schematic) When this happens the dirt block is pushed out and then replaced with a fresh grass block. The dirt block is broken with a drill, collected on the belt and then sent to a spout to be converted back to a grass block with a water and reused. This is a 12 shearing station farm that can handle up to 4 sheep per station (have not tested with 5 or more sheep). Shears are automatically made to replace exhausted shears in the deployers. Belt systems for both the grass blocks and the shears is a round robin style of system with the shear manufacturing is limited by the number of shears at anytime in the holding vault on the belt. I run the system at 256 rpm for the grass block deployers to keep up with the grass block replacement.

You will need 3100 grass blocks and 36 iron ingots(minimum) to run this machine.

You will also need a crafter slot cover to be placed on the corner mechanical crafter so it can make shears, otherwise you will have a iron ingot mess on you belt and ingots blocking the deployers from getting shears. If this happens, you will have to remove power from the machine, remove the ingots from the belt and then break all the chutes that have an ingot in them and replacing the chutes.

Set up:
- Break both vaults and replace, the wool collection vault just needs 1 to 2 blocks broken and replaced.
- Open handed sneak and right click twice all the redstone links.
- Place the crafter slot cover on the corner shear crafter
- Load iron ingots into the barrel
- Put sheep on the grass blocks
- Flip the shearing system control lever down and insure the redstone link for the shear deployer clutch is activated, and apply rotational power. Check belt movement to make sure belts feed the wool collection vault and move from the iron ingot barrel to the chutes, if not reverse the power source rotational direction.
- Use a barrel or chest with a funnel to load the grass blocks on the upper block replacement belt or just throw the blocks onto the belt.
- Flip the shear system control lever up to start farming wool.

Known block replacement issues:
Sometimes the grass block deployers fail to place a block and then the piston is stuck extended. I believe this is due to in the system lagging in most cases. To fix open handed sneak the redstone link on the pistons to switch it form receive to send mode. The piston should retract and a block is placed. Once the block is placed, open handed sneak and switch the link back to receive mode. It should work after that.