Building a 31/2" Gauge Locomotive Engine

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sbwhart:
Hi Nick

Used to put that coppering effect to good use, as you know I used to be involved with making a brass item in high volumes, from time to time when we had specials to put through the line, to identify them, at the end of the shift when the acid baths were due to be changes we'd chuck a couple of bolts into the baths put the specials through and hay presto they were pink, made it a lot more difficult to get them mixed, (but it still did happen but thats another story). I've forgotten the chemical reaction that made it happen, but I think it had something to do with the zinc being removed from a micro surface layer.

As for the bypass valve there should be one in the system I've got a copy of Curley's words and music for his loco build I'll have a read through to see what I can find.

Cheers

Stew

NickG:
Interesting stuff! :smart:

Ok thanks, it must need one really. I can't remember seeing one, just a pipe from tender to pump bottom and top goes straight into clack if I remember rightly.

Nick

sbwhart:
Ok:- Drilling the through holes to finish the body off.

Then turn the poppet velves and the rest of the couplings up, this is all the bits.

I had to do a bit of reshaping to get it to fit but her's the finished pump.

And squessed in between the frames not perfect but near enough to give me convidence that when I strip the loco down I'll be able to fettle things to get a better fit.

I've tried it out by hand and it does work but a bit of a pain to get it primed tried to take a vid but by the time I'd got it primed and then reached for the camera it had lost the prime, I'm using ellcheap orings (£1 a box from the market) and I suspect they are not up to the Job. I try and pick up some better quality rings.

Well I enjoyed that bit madmoddering I took what I thought were the best parts from two design and put them together, If I get time I may do a CAD drawing of it.

Well that my loco build on the back burner for a little while, I've got a couple quick kit improvement jobs to do then I think I'll do a engine build I've been fealing the urge for a little while know, :proj:

I was going to work on my cutter grinder idea but I need to get things outside for that and the weathers taken a turn for the worst so I leave that for another time.

Cheers

Stew

bogstandard:
Very nice indeed Stew. :clap:

Modifying things to get them to work exactly how you want is what it is all about.

Take it steady and you won't lose interest.

John

NickG:
Excellent work Stew! Oooh an engine build :)

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