A Cracker locomotive

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DaveH:
Arnold,

Well everything seem good there, I do like that pump you have. :thumbup: :thumbup: :thumbup:

It's not going to be long now before it is full steam ahead. :D :D :D

:beer:
DaveH

Rob.Wilson:
:bow: :bow: :bow: :bow: :bow: nice one Arnold :thumbup:

Rob

danstir4:
I just discovered your thread and it is great! As a beginner I really appreciate your time and trouble to show how you have done things. This will definetly be book marked for future reference.

arnoldb:
Stew, thanks :beer:, I hope to have it at least running by the end of the weekend; all the little nitty gritty things left to do :lol:

Cheers Dave :beer: - though the pump was a bit over-sized for this job... I need to make one with a smaller piston for future gas tank tests; both for better control and to use less force; I recon 3000kpa is about max for this one.

:beer: Rob, thanks mate. Will be a little slow for the next couple of days though.

Thanks danstir4 :beer: - it's a pleasure and I'm pleased you find it useful. Just be open-minded though; I'm also pretty much a beginner, and some of the things I show might not necessarily be the best way to go about things - and definitely not the only way of doing it :thumbup:. And welcome to MadModder !

I have a visitor for the rest of the week, so I doubt if much more will get done before the weekend, but I did manage to sneak in a couple of minutes after work today.

Started on some of the steam pipe work; the first thing I need are some "olives" that will get soldered to 1/8" pipe. Here I'm turning up the first one - just some 5mm hex brass turned down to 4.2mm OD to fit inside a normal M5 thread, then parted off part-way to just below 3.3mm diameter, center drilled with a 2mm center drill, and ready to be drilled through with a 3.3mm drill:

Doing it this way leaves the olive sitting on the drill bit when drilling through with a minimum of burrs.

I have some 6mm hex brass on order, but for now just made up some on the end of an 8mm hex bar:

Then followed the same procedure as with the olive to turn up a nut after drilling and tapping it for M5 - with a final drill-through at 3.3mm:

The results of today's bit - thebigger nut on the left was already made along with the steam regulator - the nut on the right and the two olives was made today. Cutting thin copper pipe is a problem, but a small rotary cutter like the one shown works a heck of a lot better than a hacksaw:

That's it for now; I think the next update will have to wait for the weekend.

:beer:, Arnold

madjackghengis:
Hi Arnold, that is looking good, and I like the idea of the center pops, I've left dog hair in a joint with the expectation of it burning out as the solder fills up the gap, but that sounds more positive and cleaner. I've also had the issue of wanting a reamed hole and not having the reamer, taking the on size drill bit, and stoning a radius on the cutting edge corner of each flute, perhaps half a mm or so, will let the bit go in the next size smaller hole, and if the radius is clean and has clearance, it will give as good a finish as a reamer will.
It's nice to see the respective parts put together even if only trial fit, it gives me a chance to get an idea of what it will look like in the end. I'm really looking forward to seeing it steam. :jaw: :beer: Cheers, mad jack

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