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Stove for a Caldera Cone
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Jon Fong
(jonfong) - F

Stove for a Caldera Cone on 05/20/2013 18:57:30 MDT Print View


There has been a lot of discussions about alternative stoves for use in the Caldera Cone. I pulled out an ION stove designed many years ago by Sgt. Rock. I added a 1/2“ shim, loaded it with 15 ml of S-L-X and fired it off. I used a Sidewinder with a 1.3 l pot. Boiled 2 cups (~70 F) in 10 minutes and boiled for another 2 1/2 minutes. I am pretty sure that my height setting was not optimal. It seems like this old “dinosaur“ of a stove is still a pretty viable option for you UL guys. Not only that, but it is pretty easy to make. I never understood why this stove isn’t more popular with the UL crowd. This stove coupled with the Caldera Cone seems like it would be an ideal match to me, then what do I know. My 2 cents - Jon

How to make an ION stove:

Franco Darioli
(Franco) - M

Locale: @Tarptent
Stove for a Caldera Cone on 05/20/2013 20:51:41 MDT Print View

I have that Ion stove and I remember testing it out with a Caldera Cone set up as I did with several other stoves.
Now I cannot remember why I did not like it as much as the 12-10, probably it was the time to boil.
I might try it again.
As for the stove to pot distance I used the same as when I used the Ion with its own stand. (20 mm)

(smoke) - F
Interested in this! on 05/21/2013 11:58:14 MDT Print View

I'm interested in this subject, as I have 2 cones (for different pots)and only one 12-10 stove. I also plan to do some DIY cones and will of course need DIY stoves to match. So any info you experts can pass along will be greatly appreciated.

William Chilton
(WilliamC3) - MLife

Locale: Antakya
Re: Interested in this! on 05/21/2013 13:29:17 MDT Print View

Dean, You know you can take the 12-10 stove from one cone and put it in the other ;)

(smoke) - F
Yes, I know that! on 05/21/2013 13:44:14 MDT Print View

Yes, but I like to keep my cook-sets together, so I can grab and go.

James Marco
(jamesdmarco) - MLife

Locale: Finger Lakes
Re: Interested in this! on 05/21/2013 14:27:14 MDT Print View

To make a modified 12-10 or chimney style stove:

1) Take the bottom parts of two cans,cutting them about 1-1/4" long. The taller the better, but there is just soo much room under a caldera cone. Take a third can and ream it around one piece. This will overlap the two pieces together. This will make the shell of a 2" stove. A little tall, but a compromise between low and high heat on the completed stove.

2) Punch 16 1/4" holes along the bottom edge of one can, about 1/4" above the bottom. Punch these from the outside to the inside to eliminate any burrs. Sand this clean to prevent the paint from sticking as it gets hot. This becomes the base. Keep the holes regularly spaced. This will help with the simmer ring later on. If you don't plan to cook with it, you can skip this step.

3) Take a small strip about 1-1/2" tall. This becomes the chimney/well. I simply roll and notch the piece into a circle. It should match the inner ring of the stove. On the top edge, punch a series of 15 holes, or, as many as is possible, near the top edge, this should be about 1/8" below the top edge.

4) With a good spade bit, in a handle for hand work, punch a hole in the top can, centered and about 1-3/8" diameter. This will leave the inner ring and a small flange. Really, you only need to etch a fairly deep scratch, then cut segments out with a utility knife.

5) Put the chimney into the rim of the bottom can, adding enough JB Weld to the bottom rim to seal the bottom of the chimney. Put the top on and press the two together untill the chimney just snugs into both rims.

6) Fireproof tape the outside joint with a 1/2" piece of aluminum tape.

7) Using JB Weld, apply glue to the "center" seam in the chimney, and, insure that the bottom is well sealed. The chimney makes the fuel well. Let it dry thuroughly. If you don't plan to cook with it, you are done.

8) The simmer ring can be made by taking the top strip, about 3/4" wide, from the top of one of the cans. This should be reamed out with a third can to stretch it to a loose fit around the stove. DO NOT cut this strip. It should be a single ring from the can! Cut from inside to outside else it will stick in operation!

9) Fitting the ring just over the holes, mark the center of each hole. Punch holes about 1/8" up, leaving a comleted hole matching your stove holes. The holes need to be punched from the inside to the outside to prevent any burring from catching on the stove!! Put the ring onto the stove. The ring should slide freely! Carefully sandpaper out any burrs or rough spots.

10) With aluminum tape (about 1/4" wide) wrap three layers aroung the bottom of the stove, about 1/8" below the existing holes in the stove. You can trim any excess width later on, or, with a needle nose pliers, crimp folds into the excess tape to round the corner over the bottom.

Let the ring slide down to the tape. To open the stove (high), simply line up the holes. It will burn for about 7-8 minutes, but, you need to adjust the amount of fuel you use to the volume of water to be boiled. The simmer ring should slide around easily with a toothpick, twig or spoon handle. It may stick a little at first, because of the adhesive on the tape. Coat with talc if it does. Closing the holes (low) should allow about a 15-20 minute burn with 1 to 1-1/2 ounce of alcohol.
A shut off can be made from a third can to instantly turn the stove off, if needed.

Pressing too hard during assembly will cause the inner chimney to crush...not good.


Note: I seem to have lost the pictures from the stove build. I thought they were uploaded here, but apparently not. These are sort of similar and show a simmer ring and a second type of stove.

ChimneyStoves Opening Comparison

Note that the first stove is similar, but taller. I have a couple pots I use in the Caldera Cone. The "Simmer Ring on the 12-10 is just aluminum foil
Chimney Stoves Height Comparison

Edited by jamesdmarco on 05/21/2013 14:38:12 MDT.

(smoke) - F
I follow, except??? on 05/21/2013 14:45:16 MDT Print View


I'm good, except what's the extra piece with the holes on the top of the first stove?

James Marco
(jamesdmarco) - MLife

Locale: Finger Lakes
Re: I follow, except??? on 05/21/2013 14:48:02 MDT Print View

Well, this was supposed to facilitate mixing a bit better. This was one of the things that I tried, but it didn't help. It seems SLX burns as well without it, though, it helps a bit with 95% ethenol. Not worth the effort.

Kevin Beeden
(captain_paranoia) - F

Locale: UK
burner suggestions on 05/22/2013 10:48:59 MDT Print View

I use a 'red bull' burner with an inward-facing jet ring and conic inner wall. You can see it on this thread:

A good alternative is the Mini Zen Chimney Stove