My mods are
Minecraft Forge 11.15.1.1722
Forge mod loader 8.0.99.99
Minecraft Coder Pack9.19
1.Set thing like this pic http://minecraft-zh.gamepedia.com/File:2013-05-10_09.03.31.png
2.Put whatever in the furnace than put a dimond(for example) in top hopper in slot one.
3.Put 64 saplings(for example) in the top chest, than you'll see all saplings change to dimonds! the rest of the sapling will into the second slot of the top hopper.
and may someone tell me how to use logs? I'll put it here later:) thx