This instructable will take you through he steps necessary to constructing a waste oil forge and lighting it. The forge takes in oil, atomizes it, and injects it into a combustion chamber along with a steady stream of air (provided by an electric leaf blower in my case). The oil will vaporize in the combustion chamber and ignite generating enough heat to melt aluminum, brass, iron, and potentially hot enough to fuse low-temp ceramics. The beauty of this machine is it’s almost as cheap to build as it is to run. I was able to construct mine out of some scrap metal and about 30 dollars worth of hardware supplies, no welding required! Additionally this forge should be able to accept a wide range of fuels, I primarily ran mine off of used fryer oil I collected from the bins behind restaurants, but I’ve found that this thing will readily burn; used motor oil, hydraulic oil, melted candle wax, even warm bacon grease. While some fuels work a little better than others, as long as it’s a liquid hydrocarbon this forge will eat it and give you tons of heat.
WARNING: This beast is dangerous! Your dealing with hot oil and temperatures exceeding 2700 degrees Fahrenheit, so, do it outdoors away from structures and anything flammable. Never leave this thing running unattended even for a minute, don’t even turn your back on it. Keep in mind, WATER MAKES OIL FIRES WORSE! Way worse, so have a fire extinguisher ready. Wear dense clothing you can take off quickly. And lastly, keep your distance when your not working with it, of course you’ll have to mess with it some while its running, but limit your time around it and you’ll limit your chances of getting a burn.