CONWAY 0-4-0 3 1/2" GAUGE LOCO

[Stuart]

Rich
 to fit longitudinal stays you need some me constant pitch taps and dies

you use say a 32tpi set then you thread the stay say 1/4 32 tpi now your boiler bush must be the same tpi but bigger

next you make up a nipple thread the OD to 32 tpi to fit the bush and then tap the id to 1/4 32tpi

by using the same thread pitch it will screw on to the stay and into the bush

this is normally used to fit a hollow stay for a blower but can be used for solid stays

glad to see some one else from the EM on here

Stuart

google my place name and you will see same neck of the woods

[Jasonb]

Stay nipples are quite simple, something like this just enlarged proportionally to suite your thread sizes

[Firebird]

Hi

Thanks Jason and Stuart. 

The nipples are not drilled right through? They seal onto the threaded bush with a copper washer?

Cheers

Rich

[Jasonb]

Drilled and tapped right through, soldered to seal.

[Firebird]

Hi

Thanks Jason.

Is there a reason for making the stays this way?

Would it not be easier to just silver solder the stays directly into the smoke box tube plate and back head, or do the threaded nipples add mechanical strength?

I assume that since the nipples are silver soldered to the boiler and become part of it they must be made from phosphor bronze or gun metal not brass. There is no mention of them on the plans.

Cheers

Rich

[Firebird]

Hi

Some more boiler work.

An hour or so in the woodworking department to make a couple of formers

Annealing the copper plate for the outer wrapper

Bending the outer wrapper around the former. This has a clamp fitted to hold the plate in position

The inner wrapper being shaped

make 2 bushes for the top of the outer wrapper, one for the safety valve and here one for the manifold

Drill 2 holes in the outer wrapper with a step drill

The 15 fire tubes are cut to length and have there ends turned square. The super heater tube had to be held using a fixed steady

Cheers

Rich

[Firebird]

Hi

One more photo

Cheers

Rich

[crueby]

Really coming along great!!

[Barneydog]

Looking good.
Saw it all this morning.
You catching up with my Simplex. We will have to "launch" them at the club together!!

Julian

[NickG]

Nice work on the boiler Rich.


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[Barneydog]

Hi,
Afetr we discussed the bushes for the blower stay here's the ones I made for my Simplex. They have the bush and the nipple. The nipples have a connection for the pipes that will fit onto them. I will seal them in with loctite thread seal or ptfe.

Figured the big pics.
Julian

[Firebird]

Hi

Thanks Crueby, Nick and Julian

A bit more boiler work, the crown stays.

Make a cardboard template and mark out for 4 pieces on 1/16" copper

After shaping

The 4 pieces are bent to make feet and a central piece made also from 1/16" copper. drilled with 1/16" copper rivets pushed in but not riveted yet

All the pieces are in the pickle now.

While they are in the pickle I have made a start on the regulator inner dome. I have a piece of thick walled brass tube that needs to be machined to size. I made a mandrel to machine the outside

Turn the outside to size

In the 3 jaw with fixed steady support to bore the inside

Cheers

Rich

[crueby]

Interesting how the crown stays are done, do they touch the inside of the outer shell too?

[Firebird]

Hi Crueby

No they don't attach to the outer wrapper they just reienforce the firebox wrapper

Cheers

Rich

[Firebird]

Hi

Some more boiler work

All the tubes have a few thou turned off for 3/16"

I used my parting off blade as a length guage

Hand wind some silver solder round a bit of 1/2" bar

Cut into rings

File some nicks into each of the tube holes in the firebox tube plate so that the silver solder will flow through

Drop all the tubes into the well fluxed tube plate and add the silver solder rings

Fit the smoke box tube plate to the front end to help keep them in line.

Ready to be silver soldered

After silver soldering

After a while in the pickle

I think I've got it 

A mock up to check on progress

Cheers

Rich