tunnel forge

short movie of my tunnel forge running

Category:

People & Blogs

Tags:

• blacksmith
• forge
• homemade

[jmetals]

Jonney,

Read the comment thread. All your questions will be answered.

[jmetals]

jonney, read the comment thread, all your questions will get answered. You are welcome to try and copy it. As with any DIY project you see here or anywhere, You are on your own. Use common sense and get help if you are unsure of any aspect of your build. Mine is about 7 or 8 years old now and is starting to show its age and I will be rebuilding it later this week. I'll use the same burner, but I'll need a new hose. I may do a new video when I get it built.

[2694wr]

is that just corigated tin ?

[jmetals]

@2694wr The outer shell is corrugated tin. It is lined on the inside with kaowool ( a ceramic wool). That wool is on the top sides and bottom. It provides the reflective radiant heat needed to reach those temps.

[hoolymakeral]

haha dont touch the top jimmi

[jiro9cuts0001]

Hey, just got done with using the modified burner, it dies help increase my efficiency, not getting as much unburned gas smell, and also getting better flame concentration. I'll have to make a video of it later for YouTube, when I am running the forge to do some dome raising for this shield I am working on. Thanks again!

[jmetals]

The size of the 1st reducer was the one that came closest. I took the burner nozzle in with me. I used 2 reducers for a double venturi effect. seems I left the baffle plate. But don't remember.Never welded in it, but suppose it;s possible with EZ Weld. It's nice when bending or braiding long bars of iron. I do not blade smith tho. Good luck

[jiro9cuts0001]

Ok, I didn't know if you happened to remember what sizes offhand, I'll just 'trial and error fit' them. Did you take the screwy baffle plate out of the burner, or leave it in? Good performance on the heating, and once it is hot it gets back up to heat fast I bet. Ever try forge welding anything in it, or does it get that hot with this setup? Thanks for the info!

[jmetals]

@jiro9cuts0001 Honestly, I went to AutoZone and found an exaust pipe reducer And then another one to step it down again. Welded them together. Took the old nozzle and cut it down the length of the two reducers. This maintains flame holding properties. Also I use a firebrick at the back (exhaust end) of the forge to create back pressure and this allows the forge to hold heat better. Otherwise the flame just runs straight thru. I can take 5, 1/2" bars from cold forge to yellow heat in about 3 min.

[jiro9cuts0001]

Propane is what your average gas grill uses, the bottles can put out as much as 350psi on a good hot day, as the gas expands in the bottle. The torch he has, less the mod tot he nozzle, comes from Harbor Freight Tools, for about $20. I also forge blades and such, as well as armor, and I've been looking for an easy mod to my torch, and this looks like the way to go. Wish I could get a better look at the nozzle mod though.