Larry Track – 2

Rail Length
Meh. In “Rail failures for the trackman: with notes on rail specifications, Rail Manufacture and Rail Specifications published 1916” .. on page 113 it clearly states “The present standard length of rail is 33 feet..”

That’s more then “good nuff” for me. 33 foot it will be.

33 foot in O scale is 8¼ inches. I have around 42 inches of larry track to construct. Since my available rail is some I stripped from lengths of Atlas Code 100 flex track – I am limited to 36 inches. That means that I have to add that additional 6 inches at some point. A soldered rail joiner of course – the question is how to hide that joint. Simply hanging it in the open makes no sense .. having the joint directly over the cross-rail makes much more sense. I’m thinking that .. it might be possible to notch the cross-rail at that point so the added thickness of the rail joiner will be hidden by that notch.
Ok. If you divide 8¼” by 1/2″ it comes out to 6.875 ~

Drop back a bit so the joint is over the last cross-rail at 6″ – or 24ft full size – or a multiple there-of .. of course. Hey .. that should work out pretty well – need 6″ and that is exactly the longest length I can use (imagineering from 33ft rail length). The 36in length of rail I stripped from the flex-track of course I don’t have to worry about any joints (for real). Patrick Welch also gave me some joint-bars .. so that will be covered.

rail_joiner_1Ok. If I notch the top of the Code 125 rail just enough that the thickness of the rail joiner allows the Code 100 rail base to align with the top of the Code 125 rail .. it would be something like this –

That’s a lot of rail joiner sticking out the sides though.

rail_joiner_2If I cut the rail joiner back to the width of the head of the Code 125 rail that would normally not be enough – but -with everything soldered into the notch of the Code 125 rail .. that might be enough to secure it. This would effectively leave only that small section of rail joiner showing. In fact .. only this side would need to be done that way .. the other side that is out of sight could be left ‘as is’ .. probably.
Well .. darn. I was happily working on a jig to implement what I’ve been yammering about .. and realized that I had the gauge set at 1-3/8″. Uhhhh .. no. That would be 66″ – or 5-1/2 ft. Shoot. What I was MEANING to do was make it 1-3/4 in. Darn darn darn.
Jigs and Gauges
gaugeMade up a quick jig to hold the cross-rails equally spaced so I could solder the larry rail to them. To keep the larry track in gauge I made a simple gauge – as it says – keeps the track at a 1-1/2″ gauge.
gauge2With the gauge flipped over you can see how it is made. Since the larry track is a simple piece of straight track this will suffice.
Test Fit 1
test_fit_1Very early in the process – about where the track will go. I have perhaps a third of the cross-rails soldered on. Once everything is soldered nicely (hopefully) – and cleaned up the next step will to construct masonry supports and chair fastenings.
Chair Fastening
chair_fasteningA couple of different chair fastenings is illustrated in the drawing on the left in blue. The version on top is more clear while the one of the bottom is more of the design I am working on. The upper version is pretty self-evident – a strap holding the larry rail in gauge. The lower version has ‘some kind’ of devices fastening the cross-rails and larry rail together.
800px-Track_jointHere’s a example of chairs used to fasten a rail to a wooden tie
chair_ver1Here’s Version 1 for a chair-fastening system. This seems to me to be reasonably simple in design – just how well it can be translated into 1:48 .. I’ll leave for later. This is at least a starting point.
chair_ver1bI may be able to make this .. the top portion for example that clamps the Code 100 rail has to fit around the rail base while the part that clamps around the Code 125 rail fits up under the head. I may .. be able to lay some sandpaper against the rail and then rub styrene against that form to get the shapes needed.

With 16 ovens, there will be 32 cross-rails .. each of those with two of these so I would need 64 chairs. It might be sensible to get a couple good ones and cast copies.

chair_ver1cWell. This is the actual design I cam up with. I uploaded it to Shapeways .. ummm .. 72 pieces I think. The idea is that I can slip the two pieces from either sides and locking them together. Shapeways accepted the mesh .. which is ok. If and when it goes successfully to the printer .. then we will see.


Larry Track – 2 — 8 Comments

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