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Old 09-24-2008, 09:09 PM   #1
Florian
 
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Default Cochran Boiler

Hi Guys

Another piece of work from my shop (which is not yet completed):
I am really fascinated by a type of boiler called "Cochran Boiler":




And i one day decided to build my own:

First parts are being tempered:




I used a round piece of pearwood to make the form for driving: (They were just felling a pear when i started my project and i took a piece of it. I then turned it down to the required diameter.)


That's the tube and also the first smoketube holding shell


And the second shell for the side of the chimney is just being driven:


tempering it with my torch:


Are there enough tubes, or shall i make some more...?


[continues soon]



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Old 09-24-2008, 09:42 PM   #2
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Now, there need to be holes in these shells. I decided to make 23 smoke tubes with 6mm outer diameter and 5mm inner diameter.

I first marked the center positions with a scriber, center punched and finally drilled with the center drill:


The next step was to drill the holes up to 6mm.


And now the shell's completed. Well nearly.


I wanted to know ithe boilers capacity and so i estimated it:

The boiler will have in about 200 cm^2 heating surface. This type of boiler has an approximate capacity of 5cm^3. This means it can vaporize 5 cm^3 water per 100cm^2 surface per minute. That makes 4370 cm^3 steam per minute.

I also need the tubes:


and with some of them inserted in the shells


I turned the ends of these tubes with a mandrel on my watchmakers lathe:


This will be the smoke tube unit:


Ist small! (ruler with mm-scale)


Continues soon...



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Old 09-24-2008, 09:51 PM   #3
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Default Re: Cochran Boiler

Hi sorveltaja

Well no, i bought two hemispheres. But i made all the rest. (Not the tube )

While i was waiting for the hemispheres to continue the copper work, i used the time to make a safety valve:










Its body is made from gunmetal and the ball is stainless steel and has 3mm diameter.
The threads to connect it with the boiler are MF 5*0.5 ( 5mm fine metric threads with 0.5 mm pitch)

Florian

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Old 09-24-2008, 10:02 PM   #4
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Default Re: Cochran Boiler

I then started making the big holes in the main boiler tube:



looks good, doesn't it?


And this will be the firebox:


from the top: (with the smaller hemisphere)


And with the big hemisphere on its top:


After trimming the tube and the big hemisphere, it loks like this:




with smoke tubes:



Now, i started drilling the oval hole for the connection between firebox and returning chamber:


and the shell with the oval hole now: (and the oval piece of tube)


somehow it looks strange...





Well that's it for the moment. I will shurely report any advance..

Florian

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Old 09-24-2008, 10:09 PM   #5
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Default Re: Cochran Boiler

Great Pictures and a good looking boiler - keep the info coming as when I find some copper I have a boiler to build and will be picking your brains.

Bob

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Old 09-24-2008, 10:27 PM   #6
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Hi Maryak

Well, you might have to travel around half the globe to pick my brain
I live in Switzerland

Florian

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Old 06-08-2009, 09:11 PM   #7
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Default Re: Cochran Boiler

Hi everyone

Although the board software reminds me to think about writing in that old topic (last post 120 days ago or more), i continue writing about an unfinished piece of work (some call it art )

Well, it has been a long time and i didn't have a loto of time for my hobby but finally i managed to continue with my cochran boiler.

Sorry guys, i didn't make a video of soldering it. I just forgot after more than half a year... It wouldn't even have been so easy to do that but i guess i would have found a way to do it..

Anyway; after the first and the second soldering step i made these two pictures of the boiler being cleaned in citric acid:








Then i had to do some soldering again and after soldering, cleaning, brushing and removing wasted solder the bolier looks really nice:














I didn't brush the firebox yet but i will do that as soon as i have the adequate brush for my dremel


Florian

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Old 06-08-2009, 09:15 PM   #8
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Default Re: Cochran Boiler

Florian,

Very nice.

Best Regards
Bob

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Old 06-08-2009, 10:08 PM   #9
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Default Re: Cochran Boiler

Florian, what a very unusual and interesting design this Cochran Boiler. Being from the MidWest US, I have never seen or heard of this design. (although that does not surprise me as there are quite a few things I have never heard of, or most likely will ) Could you tell us please, about the design's origins and what service applications it was intended for, and why. Thanks for all of the great photos and that is truly some beautiful smith work you have done.

Cheers

BC1
Jim

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Old 06-08-2009, 10:08 PM   #10
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Default Re: Cochran Boiler

Beautiful work Florian!

Rick



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