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ozzie46:

Dave, No I had not considered this possibility.

Would water be able to get in with a shrink fit? I don't know.

Anybody care to elaborate on this?

Ron

madjackghengis:
The corrosion is caused by electrolysis, with aluminum being on the wrong end of the scale, and the iron being parasitic. If you've used locktite, that will prevent a catastrophe, and will stop the corrosion when it gets there. Good cleaning of the junction, and some paint which likes aluminum, and sticks well to it, will stop the corrosion by keeping out humidity. Nothing will stop it if it is submerged constantly, or repeatedly in water, particularly salty water. Aluminum forms pores as it corrodes, so even a press fit will succumb eventually, as it makes its own gap as it corrodes. Thin locktite, made for wicking into joints and threads would work well in this situation. By the way, some side rake on the radius tool would get rid of the whiskers and give a smoother finish, along with stoning the edge with a nice hard Arkansas stone. I hope this helps a bit. :bugeye: :beer: mad jack

DavidA:
Ron,

Guess you'll just have to hope for the best.

Reference your concern in item 45 on this thread.

How far out of parallel are the axles ?

It may be an idea to get the axles/bearing block completely fitted and some coupling rods made up before you dive into the cylinders. Then you can be sure that the wheels will turn properly.
Far easier to carry out any remedial work at this stage.

Mad Jack,

Worst stuff we had to turn was inconel. All the samples started out as square sections cut from parts. You can imaging the hammering that the tool tips took from that operation.

Dave.

arnoldb:
Very good going Ron :bow: :bow: - those wheels are pretty as a picture; well worth the effort you put in!

Personally, I wouldn't be concerned about water damage in there; I'm sure you're not going to drive your loco in very wet conditions, and most of the time it will be indoors and not in use, so the affect of water corrosion would be minimal and very long-term. If there is some, I'd think it would tend to make hubs fit firmer in the rims as oxides are generally "thicker" than clean metal and will expand in the seam.
If you're really concerned about it, give it a good coating of thin non-hygroscopic oil (NOT WD40!) on a hot dry day or after a good hot run - and the oil will wick in and protect it when it cools down and prevent moisture seeping in. That should, IMHO, protect the wheels for longer than the boiler (or both of us for that matter) will last.

Kind regards, Arnold

ozzie46:

Thanks for the info Arnold. I live in a semi arid climate so humidity isn't a problem.

Ron

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