Building a 31/2" Gauge Locomotive Engine

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sbwhart:
On with the tender hand pump.

I neede some Hex bar to make some of the fitting I didn't have any but I have quite a bit of ally bronze, so using the indexer with its tail stop I made it into some 1/2 hex.

I've made a few pump using balls and was never to happy with them so decided to make this one with poppet valves.

Her it is

Tested it out at first it didn't do much then I remembered that they like a bit of back pressure so stuck my finger over the end that did the trick got a eye full of water, made a little reduction cap with a 1mm hole just to test it out, it gave a nice jet over 5 M across the garden.

Her's the completed pump

Thats another strike off the To Do List

Next job up the chimney I've bought a nice bit of 1 1/2" Sq brass for this job, and then I can't escape it any longer I'll have to make a start on the boiler.

Have fun

Stew

Stilldrillin:
Nicely done (again) Stew! :clap:

I like your poppet valve mod.... :thumbup:

You keep on ticking `em off.

Dav id D

Bernd:
Nice looking hand pump Stew. :thumbup:

Bernd

NickG:
Yep, nice hand pump there Stew. :thumbup:

That indexer has come in very handy!

sbwhart:
Thanks Chaps

On with the Chimney, you can buy a casting for this but I just fine the hassle of casting too much far easyer to make it from solid.

Visited Macmodels and picked up a chunk of 1 1/2" squ free cutting brass I asked for 4" but he gave me a good 6" for the cost of 4".

Her it is in my self centering four jaw, both ends faced with a running centre.

First the chimney was roughed out, then with the help of some radius gauges I ground myself up some form tools.

And her it is with the OD finished, just got to stick a hole down the middle now.

Have fun

Stew

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