Cooking Machine

I needed to cook up a large amount of nether rack for a project.  So first I built this furnace array fed by hoppers and a hopper mine cart.  The levers keep the hoppers from filling up the furnace.  It's most effective to let the hoppers fill up with items so as not to waste any lava cook time.  Then hoppers transport the cooked items to the storage chests below.  Nothing fancy, but it gets the job done.  The fuel source is generally lava.  Not shown is the comparator connected to the source chest that controls the power to the mine cart.