Building a Boiler for a 3 1/2" Gauge Locomotive

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Divided he ad:

--- Quote ---but in this case you only get 5 out of 10 on page three (no breasts) I also drilled the tube plate slightly smaller than the tubes.
--- End quote ---

Stew, I was thinking that it was obvious that the holes were small enough.... Any extra marks for thinking buy not stating the obvious? :lol:

Yep. I'll be at Johns Sunday, be there around 2 :) always good to catch up :thumbup:

Ralph.

Dean W:
Thanks Ralph and Stew.
I was watching and reading every page, honest! I just don't remember everything, and never was that good
at tests. At least I can reed and rite, (and spel)! Should get good marks for that, right? :scratch:

I really like this build, having never made this type of boiler. Have only made two of them at all, and they
were the type that have siphon tubes on the bottom, outside of the main boiler tube. Like for a stationary boiler.
So, I'm learning stuff here, and thanks for that!

Dean

sbwhart:

--- Quote from: Dean W on May 28, 2010, 07:35:12 PM ---
I really like this build, having never made this type of boiler. Have only made two of them at all, and they
were the type that have siphon tubes on the bottom, outside of the main boiler tube. Like for a stationary boiler.
So, I'm learning stuff here, and thanks for that!

Dean

--- End quote ---

Thanks Dean

This is certainly a huge learning experience for me as well, a bit of a trip into the unknown.

Stew

sbwhart:
Well the soldering is on the back burner (pun) :D until I gat the work done so far, checked out by the boiler inspector. So did a bit of shop maintainance.
Nocked this tooling rack up,

This frees up some space which in my small shop is at a premium.

Then did one or two machining jobs for the boiler first up the "Fire Hole" no not the sort you get after a night down the pub and a curry, the sort they shuvel the coal through.

Its made from a bit of thick wall copper tube:- a short step turned on each end so that you've got a 1/4" collar, a quick anneal and a soak in the pickle.

Then a squeeze in the vice to make it oval and here it is on the backhead.

Next up the bush for the water gauge, for some reason there is no dimensioned drawing for it, just a note saying 1/4* 32 thread. So this is my interpretation of what's required.

Using a chunk of Phos Bronze mark it out and rough it out.

This is one of those awkward jobs where if you don't machine it out in the correct order you'll end up not being able to grip it to finish the job.

Then as its got to fit on the 3 1/2 " dia boiler tube, set up the boring head to cut that dia. The body of the head is 50 mm so (88.9 - 50) / 2 = 19.5 thats what the tool has to stand out above the body to cut a 3 1/2 " dia.

With that set, pop the job in the vice, centre drill for the 1/4*32 zero up the DRO swap to the boring head and cut the rad.

Then back to the zero position and drill for the thread.

Flip it round and drill the joining hole.

A clean up with a file and this is it on the boiler tube.

Stew

Bluechip:
Stew

I made a rack from chipboard to hold 2MT Drill Chucks, Rotating Centres, etc.

It was sealed and painted.

And rusted the 2MT shanks in a most evil fashion. :(

Dave BC

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