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Smokebox front ring for Tich ???

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Mike Paling30/03/2020 19:36:11
17 forum posts

Hi ...

I am slowly getting closer to completing my large boilered Tich ... but I am not sure about the following as it is not mentioned in LSBC Tich book

I am not clear what is the best way to fix the front brass smokebox door ring in place.

Is it OK to use soft solder paste to fix it in place ... or do I need to silver solder it and thus cause the copper tube to be annealed??

I don't really fancy using rivets ( and sealant) as I know that I will get some of the rivets out of line and mess up the looks!

Any suggestions would be much appreciated.

Cheers Mike

JasonB30/03/2020 19:40:32
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Moderator
21468 forum posts
2455 photos
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You could use unslotted round head screws with the nuts inside, quite a common way to do it on traction engines

Phil H130/03/2020 19:59:39
403 forum posts
46 photos

Mike,

Soft solder is definitely out because the smokebox gets really hot.

I am assuming it is the 3 1/2" gauge version? I have heard one or two descriptions suggesting it is a push fit and or held with screws or rivets.

Redsetter30/03/2020 20:00:59
191 forum posts
3 photos

It is fairly common practice on locos of this size to make the door ring as a tight push fit into the smokebox tube. It can then be removed and refitted easily to allow access to the pipework. Since it has to be turned to a reasonably good fit anyway, this is probably the simplest method.

Former Member30/03/2020 20:01:22
1329 forum posts

[This posting has been removed]

Nick Clarke 330/03/2020 20:02:57
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1260 forum posts
50 photos

From LBSC instructions for 'Netta'

sbox.jpg

Phil H130/03/2020 20:05:07
403 forum posts
46 photos

Mike - just checked the Rob Roy book and it suggests a 'nice hand push fit'. It says that it is nice to be able to remove the whole ring and door to allow better access for tube sweeping and suggests you turn the outside of the ring very carefully to give the desired fit.

Phil H

Redsetter30/03/2020 20:30:48
191 forum posts
3 photos

It does actually say "tight push fit" in the Tich book, page 179, though it is perhaps not clear that no other fixing is required.

John Alexander Stewart30/03/2020 21:13:42
806 forum posts
53 photos

My large boiler tich - the front ring is just a push-in. I did it in my bench vice, blocks of wood, and slowly pressed it in, lots of measuring to ensure that it was going in straight.

It hasn't moved since the 1980s, doubt if it will now!

Clive Brown 130/03/2020 21:22:18
709 forum posts
33 photos

If you want the security of rivets, place them with the heads inside the smokebox and lightly countersink on the outside. With a bit of filing they won't be visible so alignment doesn't matter too much.

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