| Furnace burners potentially create more than | | | | volume.The burner design is simple, yet effective, |
| enough problems for the hobby metal casting | | | | but there are some components incorporated in |
| worker, it is not unusual to read about people | | | | the design that only require basic lathe turning |
| who are attempting to build a furnace, only to be | | | | skills. But general workshop knowledge is sufficient |
| confronted with problems and frustration with a | | | | to build this item. There's no rocket science |
| complex burner? | | | | involved.The blower consists of a second hand |
| It is quite simple to construct a crucible furnace, | | | | household vacuum cleaner (the type that has a |
| but the stumbling block seems to be: "The | | | | second outlet for the hose connection that blows). |
| burner". Why?Problems seem to manifest | | | | The vac also has an electronic vari motor speed |
| themselves because:For some reason, people | | | | control, which enables a regulated low-volume |
| choose to fabricate complex burners from | | | | airflow to be delivered during the burner start up |
| detailed drawings without the skills, tooling and | | | | phase.This feature is MOST important during the |
| machining facilities in which the original designer | | | | furnace start up.Does this burner work? You bet |
| employed during the design & building | | | | it does, the burner is capable of melting a 5 Kg |
| process.With the necessary workshop skills | | | | (11lbs) charge of Aluminium from a cold start in |
| coupled with a reasonable selection of equipment | | | | less than 40 minutes.The gas supply is provided |
| & tools, will have a marked effect on how well | | | | from a Liquid Petroleum (LP) cylinder (Propane in |
| you, as a hobby foundry worker, will be able to | | | | the states) It is essential that the gas supply be |
| construct the equipment required for the | | | | controlled by an adjustable industrial diaphragm |
| successful melting of metal.There are no short | | | | gas regulator gauge suitable for LP gas, there is |
| cuts when it comes to building equipment for your | | | | no other SAFE way to regulate & deliver fuel gas |
| hobby foundry, to cobble something together in a | | | | to a furnace burner. A ball valve should be installed |
| rough fashion is only asking for trouble in the | | | | in line as an emergency shut off valve.There's no |
| future, it is well to heed the old trade school | | | | reason to build & operate complex burners that |
| teacher quote: | | | | require special size jets, and shrouds, which must |
| "If a job is worth doing, you might as well do it | | | | be operated at a certain gas/air pressure? There |
| properly in the first place" | | | | is nothing more frustrating than an apparatus that |
| He is right, you know.You can learn how to build | | | | won't operate as it should; why spend half the |
| an effective simple furnace burner, which is well | | | | day mucking around with something that is an |
| documented in the hobby foundry ebook "Metal | | | | absolute pain to use, when you should be enjoying |
| Casting Made Easy" available at our web site. But | | | | your metal casting experience!The people who |
| to explain everything in detail here would take up | | | | design & build complex burners for other's to |
| far too much time & space.Following is a simplified | | | | copy, possess lathes, milling machines and many |
| description:The burner consists of a long plain | | | | other expensive machine tools to build the |
| black mild steel pipe. The burner end nozzle | | | | burners, but if you choose to build it even slightly |
| consists of an inverted cone. There is a mid | | | | different to the original design specs, there is a |
| section where a venturi is installed; the gas jet is | | | | good chance the burner just wont work |
| located near the venturi.The simple brass jet | | | | properly!To learn more about building hobby metal |
| protrudes into the forced air stream, which | | | | casting tools and equipment, visit: |
| travels through the burner tube. The gas jet | | | | A rich info resource centre for the hobby metal |
| orifice is quite large and operates under low | | | | caster.This article may be reproduced as long as |
| pressure; the air delivered by the blower to the | | | | the URL links and reference remain. |
| burner tube is low pressure, but moves at a high | | | | |