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| I need help with tuning a propane burner. |
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| S. Heslop:
Some of you might have seen my other thread. I'm building a gas forge which needs a burner. I've been trying to use this burner I pulled out of an old oven. The original orifice was pretty big at about 1.1 mm so today I made a slightly smaller one at about 0.8mm, which seems to be the size most people go for in most home made forge burners (it was also the smallest microdrill I had). It's running here at a pretty low pressure, maybe below 1 bar. And here's about as far as I can open the choke before it blows itself out. The flame is still pretty yellow. Is this just a case of the orifice still being too large or is there some other problem? I'm pretty hopeless with burners and i've not had much luck finding any real information about them online, so I can only guess as to what the problem might be. |
| Swarfing:
It could be you need some more air forced in? To get higher temps on my furnace i use a hairdryer for the job. Another way of messing with jets is to use mig welding tips if you want to play with sizes there. What adapter are you using for the gas bottle? |
| S. Heslop:
--- Quote from: Swarfing on March 27, 2013, 05:10:12 PM ---It could be you need some more air forced in? To get higher temps on my furnace i use a hairdryer for the job. Another way of messing with jets is to use mig welding tips if you want to play with sizes there. What adapter are you using for the gas bottle? --- End quote --- I was kinda hoping to avoid forced air with the venturi. I'm a little short on sockets. I'd also been keeping away from mig tips because I'd have to machine them to fit and I think they're made from beryllium copper. Not sure what you mean by gas bottle adapter but the bottle goes to a 0-4bar regulator, through an 8mm hose, and then onto what's left of the burner. I flared out the steel pipe a bit to hopefully keep the hose from slipping off. It's maybe not the best arrangement and I was going to machine a proper hose barb for the burner if I could get it to work. |
| Bluechip:
Polly Engineering at Long Eaton stock jets for burners, ie. the ceramic plaques, but maybe they would be too small for you. No idea what the hole size is, they just have numbers. http://www.pollymodelengineering.co.uk/sections/bruce-engineering/docs/Catalogue-October-2012.pdf Other than that, if you need titchy drills I get my PCB bits from Gloster Tooling, he has an EBAY shop. http://www.glostertooling.co.uk/ All manner of diameters < 1mm. Dave BC |
| stevehuckss396:
http://www.backyardmetalcasting.com/oliverburner1.html Take a peek at this burner. It is made from a couple pipe nipples. I have had one for a few years now and have no trouble melting aluminum and brass with it. |
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