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First 5" loco

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12/10/2012 13:44:20

I'm planning on purchasing a full set of plans from reeves and then "building" this loco in my CAD program before cutting any metal. Hopefully I will get a better handle on the design so things are easier when I do start making chips. I also want to extend the rear frame as Julian suggested (or rather pointed out). Before I get started however I have a couple more questions:

1) Although I can work in imperial (I normally work in thou when designing PCBs) I am of an age where I generally think in metric. I can easily set my CAD to show the metric equivalents so that is easy enough however I am unsure whether to go with BA or metric fine threads. Are there good reasons to stick with BA threads rather than metric fine?

2) Am I right in thinking that gunmetal is used for the majority of castings available because it obviously does not rust so is best to use in any part that may come into contact with steam? - I'm pretty sure that I have seen cast iron used for pistons but surely that can rust so why use that there?

Lots to learn

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