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| 2" minnie build so far. |
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| AndyB:
Hi Steve, Excellent work!!! :bow: :drool: I would like to pick your brains... What thickness of copper did you use for the boiler? A 2" Minnie is my next big project (after the RE!!!) and I have been looking at doubling all specs in the book...except I don't think the boiler has to be twice as thick...or does it? The wheels are fantastic. I will have to go for rolled having only 3 1/2" lathes and no mill. Any tips gratefully received. Did you make your own rollers? Andy |
| Jasonb:
Steve, its comming along well, got the fun bit of riviting in the spokes next :) Andy, 5swg or nearest metric 3.0mm would be right for the 2" Minnie, the tube number and sizes want playing with though as its better to have a larger number of tubes that are not double the 1" scale diameter. There are several other items that can be slimmed down a bit as well to avoid a chunky looking engine and the water pump is best moved away from the boiler side. J |
| AndyB:
Brill! Many thanks Jason...I should have known to ask your advice first :bow: :bow: :bow: :bow: |
| AndyB:
Brill! :clap: Hmmm...don't know what happened to post twice...I thought it was just refreshing itself :poke: Thanks Jason, I should have known to ask your advice :bow: :bow: :bow: :bow: Steve/Jason: what pitch are you using/would you use for drive gears? The 1" uses 20DP gears..which just happen the be the same as Drummond changewheels (as Mr Mason points out). Just twice the size but with the same number of teeth (which is calculable but I haven't done yet)? Andy |
| Jasonb:
When you double the scale you half the DP so 10DP would keep all the gear centers in the same place. Number of teeth stay the same. 10DP is a bit fine if you want scale appearance but as its a freelance engine anything goes and its easier to cut 10DP on smaller machines than the 8 & 6 DP on my 2" Fowler. J |
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