Building a Boiler for a 3 1/2" Gauge Locomotive

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sbwhart:
Thanks for the good information Guys its information like this that can pull a job out of the mire.

At the club night on Tuesday I took my scrap tube plate along more to get the Chaps talking and it really paid off, some of the old guys are have lots of experience building boilers, along with offers of help if I got stuck I got lots of advice and tips to get the job going.

Any way on with the tube plates:-

I clamped a chunk of wood and drilled a hole though it to clear the drill and another for a clamp bolt.

This is the set up.

To drill the holes I started them with a centre drill then for the 3/8 a 8mm cone drill and then a letter U drill the guys at the club recommend not reaming to size but to leave it slightly under size and turn a small step on the boiler tube, this way it will have something to sit against and not fall through when you start to solder.

I used the cone drill for the 3/4 as this was giving a hole that was under size on the tube again I'll take a fine skim off the tube.

Here they are finished.

Next job skim the boiler tube square and too length.

So that the chuck won't damage the tube I turned up a wood plug a nice tight fit in the tube.

With one plug in the chuck end I couldn't get the tube running true at the steady end as the tube was oval so I turned a second plug up for that end as well this pulled the ovality out of the tube.

This is the set up

I just could,t have done this with the 3 point steady as it was.

Cheers

Stew

shoey51:
Lobley jubley looking good Stew.

by the way mate the part I ordered from maccmodles did turn up yesterday
it was a small steam pump for my 7.25 gauge loco

cheers Graham

Stilldrillin:
Very nice work there Stew! :clap:

The only time I`ve needed my steady, was to support a 7" length of 1" dia alloy tube.... The brass pads scored the soft alloy! :bang:

The next time, I will have fitted ball bearings, probably! :thumbup:

David D

sbwhart:
Graham

Pleased you got your bit from maccmodles, there a bit of a two man show, Grandfather and Grandson they work out of a little terraced house that seems to be full of model stuff a real Alladins cave, always nice to chat with them, the Grandson runs the internet side of things, this seem to keep them in business, When you say steam pump do you mean injector, I know some of the larger Locos have steam driven pumps to feed the boiler with water is this the case with your loco.

Thanks Dave

The brass pads on the steady did scratch the tube but nothing to worry about the scratches had no depth and they won't be seen under the boiler cladding, I lubricated them with just a drop of oil.

See you at Harrogate tomorrow.

Stew

shoey51:
Stew this is the pump i bought

If I had had plans I might have had a go at making one myself but couldnt find any so bought this off them :D

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