Author Topic: A small cochran boiler  (Read 47653 times)

simplyloco

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Re: A small cochran boiler
« Reply #150 on: October 31, 2017, 07:27:59 PM »
Delightful! A really classy job.
John

Offline b.lindsey

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Re: A small cochran boiler
« Reply #151 on: October 31, 2017, 08:20:09 PM »
Love the family shots Florian. Have sure enjoyed following along on this one....first rate in every way.

Bill

Offline Dave Otto

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Re: A small cochran boiler
« Reply #152 on: November 01, 2017, 12:36:57 AM »
Beautiful work Florian!


Dave

Offline Kim

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Re: A small cochran boiler
« Reply #153 on: November 01, 2017, 04:19:05 AM »
Amazing work there Florian!  It's just beautiful.  The trick will be to keep it that shiny now!
Kim

Offline Zephyrin

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Re: A small cochran boiler
« Reply #154 on: November 01, 2017, 09:05:52 AM »
Beautiful work all along this thread, and very interesting boiler, never modelled as far I know, congratulations...
Do you know what was the main use for such a tall boiler ?
It would be interesting to see her steaming !


Offline Florian Eberhard

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Re: A small cochran boiler
« Reply #155 on: November 01, 2017, 07:22:09 PM »
Thank you for your praises!

Kim, I don't want to keep it that shiny, acutally I want it to get some patina, only exhibits stay like that  ;)

Zephyrin, there are at least two models of that boiler that were built before I did it. But they are somehwere from Germany or/and the Netherlands. I have never seen in real though.
And there has at least been another one, which is shown in "Handbuch Modell-Dampfmaschinen", that is kind of the "steam bible" in german Language.
I don't know much about where they were used but wikipedia says it was mainly used in marine applications, either fired by solid or fluid fuel or used for heat recovery from large combustion engines.

The movie of it under steam will come, I promise!

Now where have i been.. Right, fitting and pipe work:
I had to make those sealing "spacers" (used together with the O-ring) for most of the fittings. I also needed to solder a few pies into flanges and reproduced the pressure gauge syphon (the old one was bent too often and not looking good anymore).
To seal the connection between copper tube and pressure gauge, I tried making a 2mm compression ring and well - I was successful! Oh and I never want to do it any other way, because this is so easy in use. No soldering and cleaning off flux, no fiddling around with teflon tape.
You only put your nut on the tube, followed by the compression ring and then screw everything together and tighten it. And there you have your connection.

But i was not just doing well this evening. I managed to break one of the wooden wheels when trying to mount it. Why this happened? Well I had been treating the wooden parts with bees wax before (i acutally threw those parts into the molten wax) and well the wood changed its shape. It acutally shrinked a bit and when I started tightening the screws, the wooden ring was split immediately.  :facepalm:

Well - i'll need to make a new one then!
To be continued in a few monents..!

« Last Edit: November 01, 2017, 07:45:25 PM by Florian Eberhard »

Offline Florian Eberhard

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Re: A small cochran boiler
« Reply #156 on: November 01, 2017, 08:25:45 PM »
So here we go -

As I mentioned,  that evening was not good in every aspect - and I managed to also break the second wooden ring!   :facepalm2:
Well - I was lucky that the lathe tools were still set up and making another one went pretty quick.
So with this last wheel completed, I could finally do a quick testrun on gas!
And well - the boiler is performing extraorinary well!!
I could run my middle size steam engine (14mm bore and 30mm strocke, no expansion) at 2.5 bar boiler pressure and the ceramic burner still wasn't at its limit.
That test was on last sunday - well today I went for the first test using real coal!
I have added two pictures of that aswell - and well - it is even running better than with gas (which I expected acutally).

I have no video ready yet, need to collect some more material first  ;) ;D So this is it. The boiler is running!

A few things are left to be done but this is the end of a pretty long journey which was anything but straight forward! But the result really makes me happy  :Love:!

Cheeeeeeers  :whoohoo: :cheers: :cheers: Florian
« Last Edit: November 01, 2017, 09:25:17 PM by Florian Eberhard »

Offline crueby

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Re: A small cochran boiler
« Reply #157 on: November 01, 2017, 09:16:57 PM »
Excellent job on the boiler!

Offline Zephyrin

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Re: A small cochran boiler
« Reply #158 on: November 01, 2017, 10:43:29 PM »
Great picture of the roaring coal fire in the furnace, clearly you could be happy and proud of the result !

Offline b.lindsey

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Re: A small cochran boiler
« Reply #159 on: November 01, 2017, 11:25:00 PM »
I can certainly see why you would be very happy with that Florian. Well done!! :ThumbsUp: :ThumbsUp:

Bill

Offline Dave Otto

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Re: A small cochran boiler
« Reply #160 on: November 01, 2017, 11:28:09 PM »
Masterpiece of model engineering!
Very nice Florian.

Dave

Offline 10KPete

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Re: A small cochran boiler
« Reply #161 on: November 02, 2017, 12:28:56 AM »
Outstanding!! Beautiful workmanship. Love the detail.

Congratulations!! :cartwheel:

Pete
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Retired, finally!
SB 10K lathe, Benchmaster mill. And stuff.

Offline Kim

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Re: A small cochran boiler
« Reply #162 on: November 02, 2017, 01:21:28 AM »
Just an incredible job on this Florian!

I love the picture of the simulated coals you have in there. That is a stunning picture!
Is that the kind of rock that you'd find in a gas grill?

Kim

Offline crueby

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Re: A small cochran boiler
« Reply #163 on: November 02, 2017, 01:32:55 AM »
Just an incredible job on this Florian!

I love the picture of the simulated coals you have in there. That is a stunning picture!
Is that the kind of rock that you'd find in a gas grill?

Kim

Those last two pictures were actually running on coal, not simulated! Very nicely done!

Offline Gas_mantle

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Re: A small cochran boiler
« Reply #164 on: November 02, 2017, 01:37:11 AM »
Looks great Florian, definitely something to be proud of  :)

What is the intended working pressure ?

 

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