Finally, my forge and burners

Micha, looks good.
What is your "cooking" gas - butane, natural gas, ??? What pressure? What size orifice is it delivered through? Your burners/chokes are a unique take on a hybrid ejector burner.
 
I like the burners...very well made.

Too late now, but the burner ports should have entered the forge at a tangent, not nearly straight in as they are now. The current setup will make a hot spot where the flames sit on the bottom. It will be OK for forging, but difficult to do HT with. For HT, use a piece of pipe as a muffle and put the blade inside the pipe.

The way to figure the angle to weld the burner ports on is:
Draw a circle the size of the finished chamber.
Draw a larger circle the size of the shell.
Draw a tangent across the inner circle.
Draw a parallel line to the tangent. Is should be spaced the size of the port pipe so it enters the inner circle.
The resulting drawing will show where the port should be placed and at what angle.

When positioning the forge for the base/feet , have the tangent spot at the top or slightly down the side of the forge. This allows the flame to swirl around at least half the side before reaching the bottom where the blade sits.

It looks cool, and takes up less space to have the burners directly over the forge body, but that is just about the worst place for them in anything but a simple farriers forge.
 

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Nice forge.Mine shoots a bit straight down also.I simply grab the blade with tongs and move it around to get it evenly yellow orange hot color for heat treat.Its very fast.I like the scoot too.It looks kind of like my old sears 106 i had in 1968.Is it Benelli?
 
Thanks for the replies; well, I don't know exactly what gas we use here in Israel as cooking gas, and I don't know what pressure, either. Sorry .
A tangent intake was also tried, but with no luck. The circular flame just could not heat the steel.
The bike is a BSA WD/M20 dated late 40's, and it happened to be there too, so I took a picture of her, also. I am more into motorcycles restoration as you can see, but got bitten by the knife making, also (I ride daily a BMW R51/3 1952).
Cheers – M.
 
The flames don't heat the steel, they heat the chamber lining. It takes about 10 minutes for a forger to come up to heat. Once the chamber is up to temperature the blade will heat up from the radiation given off by the chamber walls ( as well as the flames).
Possibly the gas you are using is too low in pressure to make a hot enough flame without running it directly on the blade ,sort of like a double torch .
Most residential gas pressure in the USA is less than 1 PSI, often only 1/2 PSI. Converting to propane from a tank will solve that problem. Most venturi burners run on 3 to 15 PSI.
It would be a good idea to contact the gas company and find out what type of gas you use, and the pressure from the regulator.

The burners you built look a lot like the ones that run cooking stoves, which are much lower in output than a forge burner.
 
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