Tutorials/Automatic smelting

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Automatic Item Sorting Furnance
Compact Item Sorting Furnace: Minecraft Redstone Tutorial Video

This fully-automatic build allows for seamless integration into an existing item sorting system, and runs automatically in the background as a predetermined item is collected before reaching its final storage location.

Items collected by the item filter will be smelted by an internal furnace, collected by a set of hoppers, and transported back to the main hopper line with a dropper item elevator to be transported to a chest or storage system. This design will require the occasional addition of coal or fuel, when its corresponding chest runs low, to keep the furnace running.

The following items can be smelted with this automatic furnace design:
 * Cobblestone
 * Sand
 * Iron ore
 * Gold ore
 * Netherrack
 * Wet sponges
 * Clay

Charcoal
This design lets a furnace producing charcoal feed its product back into the furnace to fuel itself. It needs to be started off with one piece of charcoal (or for that matter, any fuel) in the chest. If more than 5-6 stacks of wood are available, another chest for input can be placed atop the upper hopper. Note that this design uses a comparator, which requires access to nether quartz.

The chest will not start receiving charcoal until both the furnace and the hopper feeding it fuel (level 2) are full. However, the hopper can be "stuffed" with four non-fuel items in its last four slots, as long as you leave the first slot open for fuel. Then the chest will start getting charcoal after two stacks of charcoal are produced, which will require 2-$1/4$ stacks of wood.

See the following video for an example of how to make this:

Video
de::technik:Ofenmaschine