Scott flame licker build

Gallery, Projects and General > Project Logs

<< < (42/59) > >>

Bogstandard:
Many thanks folks for the encouragement.

Chuck,

With a refillable gas tank, you can normally use either propane or butane, as long as you can decant it into the smaller high pressure vessel.

Propane runs a lot hotter than butane when it goes thru the burner, but I normally use a butane/propane mix that is used in plumbers blow torches, very easy to obtain and easily decanted into the refillable tank. I will be showing that rechargeable tank the end of the burner build.

While I am posting this, I may as well show you what I managed to get done this morning, rather than showing it in a much larger post tomorrow

There were three things that needed to be made, on the right, the jet holder clamp, which if made to the plans was all threading and allsorts, this one will just be stuck in the end of the tube with a clamp screw to allow the jet to be adjusted backwards/forwards. In the centre is the mixer venturi, made by drilling thru with a centre drill that has a 1/8" drill point on it. It penetrates half way thru with the 60 degree angled bit, the rest being the 1/8" tip. This not only speeds up the gas flow but mixes the gas and air together. Lastly on the left is the burner rose itself, it has been hollowed out on the back so that the face that the holes are drilled into is only 1/8" thick. This also isn't to plan, I did it to stop the thin 1/16" drill wandering off course if it had to drill the whole depth of the rose.

Using the Divmaster and ER collet chuck on the RT, I first went around the rose and spot drilled all the hole positions, then followed the same route with the 1/16" drill

The rose was a tight push fit into the burner tube, plus the tube was very slightly swaged over on the end to make sure it won't pop out when it heats up
The jet holder clamp and the venturi will be loctited into their correct position when I get back to it.

I would most probably have finished this burner off if I didn't have a couple of very welcome visitors this afternoon, Stew and Ade V, who called around for a gum beating session and for us to see Stew's flywheels close up and personal, and they are very nice indeed.

All this leaving me totally worn out.

Bogs

John Hill:
Hmmmmm John, that looks like a big burner? :scratch:

Bogstandard:
John,

I think you have to realise that it won't be a roaring burner like a blowtorch, but more of a gentle flame, like a cooking stove burner on low, plus it will be fully controllable by a screw type gas valve. The max flame length will only be 1/2".

We should see tomorrow, if I can get it finished off.

John

AdeV:

--- Quote from: John Hill on March 16, 2011, 04:32:46 PM ---Hmmmmm John, that looks like a big burner? :scratch:

--- End quote ---

It looks a lot more "in proportion" when you see it together with the engine. I'm well impressed with John's cylinder & piston; you can move them easily, with very little friction; but cover the hole in the end of the cylinder and the vacuum seal is - as far as I can tell - perfect; the piston becomes very difficult to move.

Nice to see you this afternoon John - and, once again, I felt the knowledge basically flowed one way... and it sure wasn't from me..! :thumbup:

Bogstandard:
Time to get this burner finished and out of the way for now.

The venturi, sitting in the background, needs to go down the tube from the jet end by a specific amount, so by using the thin depth reader on my digivern, that is what I did.

It was a nice 'grippy' fit down the tube, so it was tapped down with a hammer and soft drift until it got to the correct position. I got it to within 0.005" from where the drawing said, and because I have made the jet easily adjustable in/out, the perfect position for mixing can very easily be reached, a few seconds at most. It was loctited in position, as suggested in the build instructions.

The jet tube holder was then tapped into the end and again, loctited in. You can see in this shot, the venturi down in the tube, just past the air holes.

This is my cosmetically challenged refillable, commercial gas tank, it will be cleaned up and painted.
In the centre of the top you can see the 'Ronson' filler valve, which allows you, with an adaptor screwed onto a disposable plumbers torch canister, to fill the tank with gas (in fact not full, but only about 2/3rds, there is a stack tube below the valve inside that prevents overfilling). These are tested to much higher pressures than boilers, 360 psi.
The control valve isn't a normal steam one either, it has to be a special gas control valve. When I used to make these tanks, from thick walled brass seamless tube and flanged end plates, with an internal stay, the Ronson filler and control valve were always purchased, not made by myself.

A thread was put into the side of the jet tube holder and a brass screw fitted. This allowed easy adjustment of the jet backwards/forwards in relation to the venturi.

I tried the burner out not only with the brass rose that I had made, but also with a piece of ceramic burner material, made from an old boiler burner.

The brass one gave a much better jet pattern.

I hope this little vid shows what you need to know.

Not long to first run now.

Bogs

Navigation

 Message Index

Go to full version