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Still enjoying the steam shovel build and all the distractions Do you loose many submarines or is the pond shallow enough to fish them out?
Just thinking how I might attempt those track supports Could you cut the triangular webs out of one piece of flat plate (maybe overscale, say 1/8" for more strength), then bend up the inner and outer flanges from 3/4" x 1/16" strip. Might be easier to hold it all together for brazing with only three separate pieces. Perhaps the axle tube could have a 1/8" slot milled along the top to take the lower edge of the web?Maybe the pivot bosses could be added in two halves soldered on after the main fabrication, then drilled and reamed?I would try a card mock-up first . . . having never actually made anything so complex
I see this as starting with a section of flat material 3/4" thick. Mill all the channels out from both sides with a bull nose cutter (small radius corners). Drill for the outside diameter of the two cylindrical parts at the corners. Make these holes smaller so that collars can be fitted either side and be brazed in later. These holes can be used to locate in a jig while the triangular hole and outer profile are cut. Jig can be tilted to profile the cross section taper. The main bearing housing is again a seperate item which can be located for brazing if the triangular brace has a corresponding rebate milled into it. Might be a few fiddly bits but I think that is where I would start from although I would probably see the error of my thinking if the job were in front of me! An absolute cracking job you are making of this so all respect to you.
As an ace fabricator I am sure that you will come up with a good solution! When faced with the need for chunky bits of metal I have often found that it is cheaper to buy a length of round stock that will encompass the finished item, rather than buying flat stock.