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Old 09-01-2018, 03:37 PM   #11
RSR Engineer
Artur Gorote
 
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Default Finally starting

Having said last summer that it would take till the autumn to get the heating installed in the hobby room, I finally got it warm in there a few days before Christmas. The last two weeks have been taken up with partially reassembling the old layout on a couple of beergarden tables to check the overall dimensions (a scale diagram does not exist) and determine the location of the "interfaces" between the part of the old layout I'm reusing and the new bits that are to added.

This work is now done and I can show a revised diagram of the new layout (looks a total rats' nest because there are three levels in places). The layout is to have an open frame construction, in fact a mixture of large boards (carrying the old station) and curved strips (carrying the tracks outside station precincts).

The work is documented on flickr. https://www.flickr.com/photos/537755...57691105841734
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File Type: jpg option11-01d20-3rail.jpg (278.7 KB, 88 views)

Last edited by RSR Engineer; 09-01-2018 at 03:48 PM. Reason: spelling/typo
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Old 09-01-2018, 03:48 PM   #12
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Yes, well, it looks as though that is all coming together very nicely, I think!

Lovely space you have there and put to good use it seems.

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Old 09-01-2018, 05:46 PM   #13
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What an amazing layout. Look forward to seeing lots of pictures.
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Old 21-01-2018, 03:36 PM   #14
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Default Mainframe design

Many thanks again for your feedback, gentlemen.

Now that the layout of the new tracks is definitive, I have been able to plot the contours of the boards. Where there are concentric (or almost) curves, the idea is to cut all curved strips from one piece of board, leaving the majority of the intervening space beside the lower tracks, to leave room for scenery (e.g. an embankment). Where the board material does not come in big enough pieces, I shall join several together with fishplates and plot the cutlines across all boards at once.

The diagram mainframe+boards shows how the various boards fit beside and over each other. It's important on a multilevel layout to make sure there's enough headroom for trains on the lower tracks and that the loading gauge is not obstructed by anything (e.g. point motors or wires) jutting or hanging down. The gradients diagram shows the height above datum of all tracks below top (i.e. station) level.

The mainframe-ref diagram was first sketched out on spec and then adjusted when the boards were superimposed on it. The grey rectangle at bottom right is where a lift-out section is to be provided to allow better access. The individual frame members have been assigned references.

Board material is to be 12mm oriented strand board. I tried some of this out at the local DIY and it seems more stable than the classical stuff.

Diagram querspant01 shows a cross-section of members H3, H4 and H5 where they cross members V3 and V4. Diagram querspant02 gives the cross-section where members V7 and V8 cross H3 and H4. The scale at the bottom shows 10cm intervals. The relative positions of the boards are shown in the same colours as in other diagrams. Board supports are omitted for clarity. A major deviation from the classical L-girder construction is that where there are large areas of board at the bottom level, the joists are flush with the mainframe rather than mounted on top of it.

The mainframe will be made of the same kind of wood as in the old layout, two timbers each 30x50mm.
Attached Images
File Type: jpg option11-01d20-gradients.jpg (266.7 KB, 43 views)
File Type: jpg option11-01d20-querspant02.jpg (101.2 KB, 21 views)
File Type: jpg option11-01d20-querspant01.jpg (100.3 KB, 17 views)

Last edited by RSR Engineer; 21-02-2018 at 12:57 AM. Reason: Forgot a bit. Spelling. Vocabulary. References added.
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Old 21-02-2018, 12:57 AM   #15
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Default Getting something done

Finally, after finalising a few details, I have started to build the mainframe of the new layout. Each mainframe member consists of two 30x50 mm timbers screwed together to form an inverted "L". The first photo shows the lower timbers for the southwest corner of the layout set up on a couple of tables. The second photo shows the upper timbers screwed into place. Also attached are revised diagrams of the mainframe and boards.
Attached Images
File Type: jpg NL001x.jpg (239.7 KB, 41 views)
File Type: jpg NL002x.jpg (238.8 KB, 31 views)
File Type: jpg option11-01d20-mainframe+boards.jpg (155.9 KB, 41 views)
File Type: jpg option11-01d20-mainframe-ref.jpg (168.4 KB, 35 views)
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Old 21-02-2018, 08:41 AM   #16
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Looking great. Is a nice size as well.
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Old 27-02-2018, 06:40 PM   #17
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Default Standing on its own four feet

Just got the southwest corner of the mainframe assembled and up on the first four legs. Can't really proceed much further till I've made all the upper timbers. Cross-bracing still needs to be added to the legs - at the moment this little subassembly sways like a flagpole in the wind.

The construction of the new layout is documented in more detail in flickr:
https://www.flickr.com/photos/537755...57693670264075
Attached Images
File Type: jpg NL005x.jpg (234.7 KB, 36 views)

Last edited by RSR Engineer; 27-02-2018 at 06:44 PM. Reason: Added URL
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Old 14-03-2018, 09:04 AM   #18
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Default A bit more progress

All the timbers are now made. The northwest corner has been assembled and set up on legs. The low-level subassembly for the valley floor has been made and hung in place. A few details still have to be sorted. The rest of the mainframe should be quite straightforward, since the work is all on one level.

The construction of the new layout is documented in more detail in flickr:
https://www.flickr.com/photos/537755...57693670264075
Attached Images
File Type: jpg NL009x.jpg (283.9 KB, 41 views)
File Type: jpg NL010x.jpg (252.2 KB, 28 views)
File Type: jpg NL012x.jpg (249.7 KB, 28 views)
File Type: jpg NL013x.jpg (257.3 KB, 26 views)
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Old 14-03-2018, 02:08 PM   #19
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That looks good.
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Old 14-03-2018, 10:13 PM   #20
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Thank you, Mountain Goat. Now that the complicated bit for the valley floor is done, the rest of the work is progressing fairly quickly. Easy to say but I reckon I could have the main frame done this month.

There seems to be a URL error. Should be:
https://www.flickr.com/photos/537755...57693670264075

Last edited by RSR Engineer; 14-03-2018 at 10:17 PM. Reason: URL
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