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Member postings for John Andrews 2

Here is a list of all the postings John Andrews 2 has made in our forums. Click on a thread name to jump to the thread.

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Thread: Cylinder Liners
12/10/2011 06:52:06
I am building a 5" ga 2-8-0
 
It has Bronze castings for the cylinders, already machined to diameter.
The steam entry and exit is via slots cut into the body of the casting and the steam enters/exits via the passage between these slots and the liner.
The liner is of Cast Iron, and hence needs to be sealed. I used Loctite 620.
 
I was advised not to machine the liners and then fit them after due to the danger of breaking the liners.
 
The cylinders are too large to fit the liners and then machine on the lathe, so I turned the outside diameter to a sliding fit and loctited them into the casting. Then I bored them to size wih a boring head.
Unfortunately, the boring head was not correctly centered and I have 0.4 mm error in concentricity.
 
The minimum thickness of the liners is now 1.2 mm, and their OD is 43.2 mm
I had originally intended to make new liners and fit then fit them, as clearly they can be safely removed.
 
But If I can hold the recovered liner concentric, I could perhaps bore it out to concentricity.
HOW TO HOLD IT? It's too thin to but in the 4 jaw chuck. Some type of collet suggests itself. Or just give it away and start again?
 
John A
Thread: Sealing a loco smoke box
07/10/2009 11:59:53
When I built my "Marie E" 7 years ago I considered using some of the harder stuff like mentioned in the other posts, but was strongly advised not to because you need to get it out if you need to dismantle the loco.
 
I used Plaster of Paris.  Cheap, easy to buy, softish, should be easy to remove.  It does tend to absorb water vapour, and you could ge a bit of rust, but in seven years and nearly 1000 kms of loco travel, there are no smoke box leaks.
 
It's what I'll be using in my next loco too.
 
AND, DO leave the sealing till the last minute.  When you have tested everything, done the painting and you are ready to go on the track, that's the time.
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