The Nudge Burner Nozzle
1 Brass T fitting with inside hole 10.5 diameter
3 Brass nuts to fit T fitting
3/8 bolt at least 100mm long
1 Dome Nut to suit bolt
1 O ring 10.5 o/d 8.5 internal
8mm dia steel rod – 50mm long
1 Brass elbow fitting to suit T fitting
2 Hose barbs to suit 10mm hose minimum
Weld the Dome Nut to the end of one of the Brass nuts.
Cut the head off the bolt.
Wind the bolt into the other end of the nut so it can be held in the lathe to enable a 1/8 hole to be drilled centrally through the dome nut. Now wind the nut off the bolt (leaving the bolt in the chuck) & continue drilling right through with a long series ( 1/8 ) drill bit.
While bolt is still in the lathe, enlarge the hole with a 5.3mm bit, to a depth of 15mm & tap with a 6 x 0.75 tap.
Turn bolt around in the lathe
Work out the position for the O ring so that it will sit midway between one end of the T fitting & the cross hole ( this will allow room to cut another O ring groove if needed). Cut groove to suit O ring. Cut a slot in the end of the bolt with the O ring on, to accept a screwdriver.
To make the Oil Tip
Take the 8mm rod, put in lathe & turn down a piece to 6mm dia & 10mm long. Now cut a 6 x 0.75 thread on it. Part off to a total length of 20mm.
Put the bolt back into the lathe with the 6mm thread pointing out and wind the embryo tip ( the thing you just made ) into it. Turn down the tip to about 2.7mm (must fit through the hole in the dome nut with a small gap) for a length of 7mm.
Face it off & drill through with a 1.5mm bit.
Remove the bolt with the now completed tip from the lathe & with a small round file, file grooves ( I did 6) around the bolt in a spiraling fashion. The grooves are to let the air past, so they will need to be deeper than the thread on the bolt.
Grab the other 2 brass nuts & weld on either a hose barb or a short thread to accept a valve. One will be used for air & the other for oil.
Time to Assemble!
Put the O ring on the bolt.
Fit the bolt into the T fitting
Wind on the dome nut fitting onto the T fitting with Teflon tape then adjust the bolt so that the tip is flush with the end of the dome nut.
Wind one of the nuts with hose barb to the opposite end of the T fitting ( this is the oil inlet).
Wind the elbow fitting on to the remaining thread of the T fitting so that it points the same direction as the oil inlet.
Then add the nut with hose barb to this. (this becomes the air inlet).
And now to use the thing……
Connect the oil to a tank on a stand at least 1.5m high with a valve close to the burner & the air line to a compressor with it set to 10 – 15 PSI. Put the burner nozzle into a piece of 50mm pipe 400mm long. You are now ready to run. :P
To light the burner, put a gas torch in from behind the burner.
Turn the air on first and then slowly turn on the oil, keeping the gas torch in place until you have a sustainable flame out the other end of the pipe. Please do this outside, but not on the wife’s prized piece of lawn! :roll:
After the initial testing I added a valve to adjust the air (Red valve) and the oil (Silver valve) and fitted it in an elbow so extra air can be added without needing to turn up the pressure on the compressor.
To start up in the furnace, use a piece of rag dipped in Diesel. Light it and drop it into the furnace, now turn the air, (this will make the rag burn a lot better )Then slowly turn on the oil ,It should start burning with a Whoosh :twisted:
After a while adjust the air / oil and things will get hot.
If you cant get the oil to flow then add about 10% Diesel to the oil,
I will be making a pressure tank for the oil so I can give it more fuel as needed and so I don't have to add any Diesel to the mix to get up to Iron temp. :twisted: