Author Topic: Building a 31/2" Gauge Locomotive Engine  (Read 154723 times)

Offline Divided he ad

  • WARNING: LIKES SHINEY THINGS
  • The Collective
  • Hero Member
  • *****
  • Posts: 1946
  • Country: gb
  • Between Chester, Wrexham, ruthin & Holywell :-)
Re: Building a 31/2" Gauge Locomotive Engine
« Reply #325 on: March 25, 2010, 02:13:56 PM »
Nicely thought out and executed Stew  :thumbup:



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?    :scratch:







Ralph.
I know what I know and need to know more!!!

Offline Stilldrillin

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 4955
  • Country: gb
  • Staveley, Derbyshire. England.
Re: Building a 31/2" Gauge Locomotive Engine
« Reply #326 on: March 25, 2010, 02:42:26 PM »
Nicely thought out and executed Stew  :thumbup:



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?    :scratch:
Ralph.

I thought that!   ::)

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

David D
David.

Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!

Offline sbwhart

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 3524
  • Country: gb
  • Smile, Be Happy, Have Fun and Rock Until you Drop
Re: Building a 31/2" Gauge Locomotive Engine
« Reply #327 on: March 25, 2010, 05:41:12 PM »
Nicely thought out and executed Stew  :thumbup:



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?    :scratch:
Ralph.

I thought that!   ::)

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

David D


MMMMMMMMMMMMMMMMMMMMMMMMMM   Good question   :scratch:

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.




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

A little bit of clearance never got in the road
 :wave:

Location:- Crewe Cheshire

Offline John Hill

  • The Artful Bodger
  • Madmodder Committee
  • Hero Member
  • *****
  • Posts: 1978
  • Country: nz
Re: Building a 31/2" Gauge Locomotive Engine
« Reply #328 on: March 25, 2010, 07:39:48 PM »
Great project Stew, I really enjoy following your progress on this one and every part is more impressive than the previous!
From the den of The Artful Bodger

Offline Divided he ad

  • WARNING: LIKES SHINEY THINGS
  • The Collective
  • Hero Member
  • *****
  • Posts: 1946
  • Country: gb
  • Between Chester, Wrexham, ruthin & Holywell :-)
Re: Building a 31/2" Gauge Locomotive Engine
« Reply #329 on: March 25, 2010, 09:32:26 PM »
Quote
Hope this makes sense

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


Thanks for the answer....


Now, as you were  :thumbup:   :)





Ralph.
I know what I know and need to know more!!!

Offline Stilldrillin

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 4955
  • Country: gb
  • Staveley, Derbyshire. England.
Re: Building a 31/2" Gauge Locomotive Engine
« Reply #330 on: March 26, 2010, 05:45:19 AM »

Quote
Hope this makes sense

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


Thanks for the answer....


Now, as you were  :thumbup:   :)
Ralph.


Carry on........

David D
David.

Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!

Offline madjackghengis

  • Hero Member
  • *****
  • Posts: 717
  • big engine
Re: Building a 31/2" Gauge Locomotive Engine
« Reply #331 on: March 26, 2010, 11:13:26 AM »
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

Offline sbwhart

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 3524
  • Country: gb
  • Smile, Be Happy, Have Fun and Rock Until you Drop
Re: Building a 31/2" Gauge Locomotive Engine
« Reply #332 on: March 27, 2010, 11:57:30 AM »
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.



Whoops  :doh::-- Soldered one of the brass bars to the dome    :lol:  :D



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.




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



Thats it another one off the list.



Cheers

Have fun

Stew



A little bit of clearance never got in the road
 :wave:

Location:- Crewe Cheshire

Offline NickG

  • Madmodder Committee
  • Hero Member
  • *****
  • Posts: 1890
Re: Building a 31/2" Gauge Locomotive Engine
« Reply #333 on: March 27, 2010, 07:55:36 PM »
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
Location: County Durham (North East England)

Offline sbwhart

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 3524
  • Country: gb
  • Smile, Be Happy, Have Fun and Rock Until you Drop
Re: Building a 31/2" Gauge Locomotive Engine
« Reply #334 on: March 27, 2010, 08:26:29 PM »
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
A little bit of clearance never got in the road
 :wave:

Location:- Crewe Cheshire