|Keith Rogers 2||11/02/2019 13:58:31|
|58 forum posts|
Hi, I,m currently helping a friend progress with building a Tich loco he started 40yrs ago. We are close to assembling his boiler parts but have got stuck trying to source some thick walled (5/32 OD x aprox 1/16 ID) copper tube for the hollow stay. I can find some 22g but as this has to be threaded 5/32x40 it only leaves 12thou at the root -- not good for a boiler stay
I know it was available 'cos I have it in my own Tich boiler (which was not built by me)
Any suggestions where I might get some would be much appreciated.
|Nick Clarke 3||11/02/2019 19:14:41|
201 forum posts
As a different approach what about an external feed (between the frames??) to the blower and add an extra solid stay?
|duncan webster||11/02/2019 19:59:12|
1962 forum posts
If using an external feed I'd put it right next to the boiler under the cladding to keep it hot. I've seen at least one loco at our track with water droplets coming out of the blower as the feed pipe was running in fresh air. Two of my locos are done as suggested successfully
|85 forum posts|
Would suggest you try John Keatley Metals Ltd , Birmingham, 0121 236 4300
They are most helpful , and I am sure will be able to supply this .
|269 forum posts|
Or consider using 3/16 x 16swg (= .064" or 1/16" wall thickness) which is commonly available? Adjust threads and fittings (bushes etc.) to suit 1/32 diameter increase.
|John Baguley||11/02/2019 23:44:06|
413 forum posts
I finished off a couple of Tich boilers for someone some years back and had the same problem. I just used ordinary thin wall copper tube and silver soldered bronze ferrules on the ends. One was threaded to screw into the blower valve and the other threaded 1/4 x 40 to screw into the bush in the front tube plate. You could also just silver solder the tube into the blower valve. I did that on my Helen Long boiler.
Not a good photo but you can see the blower stay at the bottom. You don't need the double threaded fitting on the smokebox end. The end of the ferrule is countersunk and the blower pipe just fits straight onto that.
Edited By John Baguley on 11/02/2019 23:44:55
|paul rushmer||12/02/2019 11:08:19|
|74 forum posts|
3/16 16swg copper tube is available from Blackgates in short lengths delivery normally by return.
Hope this helps
|Keith Rogers 2||12/02/2019 22:31:11|
|58 forum posts|
Thanks for all the replies, most helpful.
At the moment it's a toss-up between JB's idea or increasing to 3/16.
Unfortunately Duncan there is no space between the boiler and the cladding on the Tich, I don't think LBSC believed in insulation .
Thanks again .
Please login to post a reply.
Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!
You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.
Click THIS LINK for full contact details.
For subscription issues please see THIS LINK.