Automatic furnace (found on Youtube):
1. Place your chest on the ground. This will be your 'finished' chest.
2. Place a hopper on one of the sides (lift-shift & right-click)
3. Place a furnace on top of the hopper (lift-shift & right-click)
4. Place 2 hoppers on the furnace; one on the side, one on the top
5. Place a chest on each of the hoppers (your 'fuel' chest is the side, & the 'to be cooked/smelted' chest is the top)
6. place your fuel in the side chest, food/stuff to smelt in the top chest. and let it do it's job.
The way this setup works is that the furnace is constantly fed fuel & material to be smelted/cooked while it is also constantly dropping the finished product into the 'finished' chest. this in convenient because as long as you make sure that it has plenty of fuel you can place as many things in top as you need smelted and go away to do some stuff & come back later and pick up your finished product at your leisure (& depending on how much you loaded the chests it will probably still be turning out smelted/cooked stuff.
Automatic Furnace (double):
The point of this chest is to be able to smelt/cook twice as much stuff in the same time as the single auto-furnace.
1. Place a double chest (2 chests right next to each other) on the ground.
2. Place 2 hoppers on the back of the chest
3. Place a furnace on each hopper
4. Place 2 hoppers on each furnace (one on the back, one on top)
5. Place a chest on each hopper (this will make a double-chest on top & in the back)
6. Load top chest with stuff for cooking/smelting & back chest with fuel
1. Place a dispenser on the ground and lay a pressure plate down in front of it
2. Place a hopper on the dispenser
3. Place a chest on the hopper, and then place a hopper on the chest
4. Place a furnace on that hopper
5. Place a hopper on both the top & side/back
This one is especially good for cook-able food items like potatoes, fish, chicken, etc as it cooks the food & then will store it in the dispenser until the dispenser is full. When the dispenser is full it will be stored in the first chest. What is great about this one is that when you need something to eat all you need to do is step on the pressure plate and viola! :D You can also put a button on the dispenser instead of using a pressure plate to activate, but i personally prefer the pressure plate.
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