Building a 31/2" Gauge Locomotive Engine

[Divided he ad]

Nicely thought out and executed Stew 



I have just two questions.(same answer I suppose?)

possibly general knowledge to those of you who revere the locos?

But anyway.... here goes, why does the chimney get a copper liner? And, What would happen just leaving the brass chimney without the liner?   







Ralph.

[Stilldrillin]

Nicely thought out and executed Stew 



I have just two questions.(same answer I suppose?)

possibly general knowledge to those of you who revere the locos?

But anyway.... here goes, why does the chimney get a copper liner? And, What would happen just leaving the brass chimney without the liner?   
Ralph.

I thought that!   

But didn`t like to ask........

David D

[sbwhart]

Nicely thought out and executed Stew 



I have just two questions.(same answer I suppose?)

possibly general knowledge to those of you who revere the locos?

But anyway.... here goes, why does the chimney get a copper liner? And, What would happen just leaving the brass chimney without the liner?   
Ralph.

I thought that!   

But didn`t like to ask........

David D

MMMMMMMMMMMMMMMMMMMMMMMMMM   Good question   

I think it has something to do with the fact that the chimney extends down into the smoke box,  bit like an Iceberg under the water, you can see it her the drawing on the right, the copper liner is an easy way to do this.

Building a 31/2" Gauge Locomotive Engine


This is so it can catch the exhausted steam which creates a draft drawing the air through grate and improving the combustion of the coal getting the firebox good and hot and making steam.

Also I don't think the brass will like the corrosive effects from the flue gases, the zinc may react to them.

Hope this makes sense

Stew

[John Hill]

Great project Stew, I really enjoy following your progress on this one and every part is more impressive than the previous!

[Divided he ad]

Hope this makes sense

Fair enough Stew, decipher the drawing properly the first time!


Thanks for the answer....


Now, as you were     





Ralph.

[Stilldrillin]

Hope this makes sense

Fair enough Stew, decipher the drawing properly the first time!


Thanks for the answer....


Now, as you were     
Ralph.

Carry on........

David D

[madjackghengis]

Doing a fine looking job on that chimney, and giving a good answer to a question I had myself, regarding the copper tube.  Great job, can't wait to hear it run  Mad Jack

[sbwhart]

Thanks Jack

Now for the inner steam dome, the regulator fit in this and sits on top of the boiler where the dry steam collects. Its fabricated from 1 1/8 dia copper tube and copper/Phos bronze:- here are the bits set up for soldering, I used the brass bar to keep the copper collar in place.

Building a 31/2" Gauge Locomotive Engine

Whoops  :-- Soldered one of the brass bars to the dome     

Building a 31/2" Gauge Locomotive Engine

Never mind just cleaned off when I set the job up true in the lathe to clean the face that will seal on the boiler.

Building a 31/2" Gauge Locomotive Engine


Last job drill 12 holes in the collar for bolting to the boiler, using the PCD feature on the DRO.

Building a 31/2" Gauge Locomotive Engine

Thats it another one off the list.

Building a 31/2" Gauge Locomotive Engine

Cheers

Have fun

Stew

[NickG]

Stew,
that is really the first part of your boiler!
As I mentioned in the elbow engine post, I got to meet Stew on Thurs and he showed me this engine running too - sounds very powerful with a great exhaust beat. Sure it will be an excellent steamer.

Nick

[sbwhart]

Thanks Nick it was nice meeting up with you and chewing the fat.

Now you come to mention it yes that is the first bit of the boiler never thought of it that way, I've just got to get the rest of it done now, I,m thinking of starting another topic just for the boiler build.

Cheers

Stew