Venturi Foundry Burner

thingiverse

This is a Venturi Burner that I designed and successfully constructed for my metal casting foundry. The hole facing backward is designed to be drilled and tapped with an M6 Thread, allowing for the installation of a stud if you want to use a damper flap; however, I have never used one so mine has been blanked with an M6 screw instead. Facing forward, it is also designed to be drilled and tapped with an M6 thread. Once the front is tapped to M6, it accepts a 3D printer nozzle - these are readily available on eBay in sizes ranging from 0.2mm (I believe) up to over 1mm. By purchasing multiple nozzles of different sizes, you can create a configurable gas orifice without needing tiny drill bits; in fact, buying the 3D nozzles is probably cheaper than purchasing small drill bits that would likely break while drilling anyway. The assembly shown here is designed to be mounted on a long 1-inch steel pipe nipple, which then connects to your furnace and so forth. I printed mine out using my 3D printer, then set it in plaster of Paris and fiberglass; afterwards, I burned out the plastic, leaving a void that I filled with molten bronze. If you use a large gas orifice, the Venturi effect may not provide sufficient airflow - in this case, you might want to consider having a fan blow into it, as seen on mine in the photo. With this burner, I am able to easily melt aluminum, brass, bronze, and copper.