P2 Locomotive Company and related matters

Yes, I'd like to have attended but two days of work came up so they take priority nowadays...

 

Don't quote me as I can't be bothered to check properly, but I thought I saw a comment on FB that the paint had to be removed to get it to go on!

 

The date of the Convention had been set for Saturday 3rd October and Covenantors have been advised of this in The Communication Cord. This event was aimed at Club members and supporters and does not replace the Convention in any way. The aim is to hold more of these gatherings as assembly accelerates, as an exclusive reward for supporters of relevant Clubs as their component(s) is/are fitted.

David Elliott prescribed 'wet assembly' to reduce corrosion.

Foxy

 

"Wet assembly"....but paint a no no. Having met Mr Elliott I would think he would be horrified at the use of paint.

 

So what is being meant by wet assembly, then?

 

All this effort going into this amazing front end, roller bearings etc...

Still going to be hand fired with Coal? Surely this is the chance to oil fire this engine properly from the start.
Much more versatile, easy fuelling, clean and no fire risk. I would chuck money at this project if it was brave enough to take this path and future proof 2007.

 

Apologies, I missed that. The date is indeed mentioned in CC78 that I received on 13 June. "Full details will be sent imminently". I await eagerly.

 

is it paint, or is it red oxide? Not exactly the same thing...

 

I don’t know the engineering principles, but I worked with an engineer (fellow of the mechanicals) and where ever we did riveting of plates there was always a liberal coating of anti corrosive primer applied to both sides before bolting up whilst still wet and then riveted. Always seemed good idea when you saw the amount of jack rust on unrestored items.

 

I’m struggling to see the downside. I’d certainly want something on the mating faces to prevent moisture ingress causing rusting.

 

The only downside really is clearence, its another tolerance to be accounted for.

Its a fine enough idea, and in practive, eventually, moisiture will still get in there and corrosion will still happen. This is just an attempt to slow that process.

 

Nowt wrong with some grease on the faces, surely?

 

Indeed, but it depends on clearances and tolerances. No point in painting the surfaces if it gets scratched and damaged when the cylinders are installed.

 

You coat with whatever at the point of assembly, so it gets squished as the bolts / rivets are tightened.

 

There are some brake caliper bolts on a bike that are not to be greased as it affects the torque rating. (Presumably this can't be factored in due to lack of control of grease levels).
It's interesting as all the other new-builds are going for metal-metal contact.
Assuming it's not a friction fit, there will be some gap between the two. But could a build-up of paint cause a layer that not crushed entirely by the fitting, and then wear away later through chemical decomposition?

Maybe we should strip Tornado down and find out how it's doing...?

 

Same result, different timeframe.

 

It was traditional to use red lead on surface to be riveted, painted on at assembly time. That's a no-no these days and I would suggest that micaceous iron oxide is the best alternative.