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| Building a Boiler for a 3 1/2" Gauge Locomotive |
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| NickG:
Stew, that's unlucky :(, at least you found the culprit though. I think I said before, my club wanted to see both hollow and solid stays soldered in - maybe they've seen this sort of thing before. I can't see why not to solder it really or did lbsc have a specific reason for this? All the other ones i've seen are soldered. Either way, it looks like 1 job and it's an official tested boiler :thumbup: :) Nick |
| sbwhart:
I'm coming round to the idea of soldering the longitudinal stays Nick. I showed the inspector the threaded stays last week and he didn't say anything about them, but I know some of the guys at the club solder them. They screw into the front tube plate which is about 2.5mm thick so they are not holding onto much. I'm particularly concerned with the wet header Its 3/8 * 32 thread and it doesn't feel positive at all, I've screwed it into the tube plate with stud lock but I'm considering bushing it. Stew |
| madjackghengis:
Hi Stew, again, you show the weak point of design, demonstrate it admirably, (hard to get a better picture of tube failure than the one you show), and give us on the sidelines, a lesson for our own build, when it comes time. Your comment on the "wet stay" and it's 3/8ths 32 thread touches a nerve of my own, having had failures which were just because I took a flat too many on a very fine thread. Perhaps I'm speaking out of ignorance, correct me if you think so, but have you considered simply firing up a torch and soldering the threaded wet stay in place, as it stands now? I have long used a "back nut" on long studs threaded into a plate I consider barely within the limits, and have had second thoughts and added solder after the nut, just for security. Much of the work I used to do was on miniature electronics as goes in military aircraft, and finding hardware that was just barely within its capacity was not unusual, particularly with the equipment that we still had that came from the war era, some of it pre-war, from the early thirties. With radar and high frequency radio, one is working with boxes and tubes very much like boilers, as "resonant chambers", and the fastening hardware has to hold up to the extremes of flight and the vibration of enormous engines and sheer inertia was a common culprit in the breaking of fasteners. In any case, I hope your time with the inspector proves out the boiler, and gets you certified, so you can move forward closing it up and all. :nrocks:mostly because of the mechanics who work it. :headbang: mad jack |
| NickG:
Yeah, that's what they said to me, if they aren't being soldered they should be bushed. It's all together a slightly strange design I think. Anyway, you've made a few good mods to yours, it'll be sorted soon, bet you can't wait to crack on with it now! Nick |
| shoey51:
thats bad luck Stew but im sure you will sort it Graham In sunny midlands lol |
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