Templot Club Archive 2007-2020
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posted: 16 Nov 2008 22:52 from: Paul Boyd
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The attached JPEG shows parallel tracks coming in from the LHS. They start diverging at about the 5.5ft mark. I've created a crossover after the divergion point (is that a word??) by a lot of adjusting of crossing angles and roaming until the two turnouts involved line up closely enough for track building. Both turnouts have a curviform crossing. The question is though, how should I have done it so that the turnouts align correctly without all the trial and error faffing about, based on the positions of the diverging tracks being fixed? (I know the timbering is wrong - I haven't started shoving yet!) |
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| Attachment: attach_414_632_diverging_crossover.jpg 302 | |||
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posted: 17 Nov 2008 01:49 from: Richard Spratt
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Isn't it like turnout 7 in the first tutorial? http://www.templot.com/martweb/tut5a.htm Richard |
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posted: 17 Nov 2008 02:10 from: Paul Boyd
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Hi Richard Not really, because in that tutorial the turnout is placed, then the exit track pegged onto it. On my plan the positions of the tracks are already defined, and the crossover needs to fit into what's already there. The attached picture shows what I was starting from. I did use the 'make transition curve' function to give me a nice s-curve between the two lines, but I couldn't get a turnout to line up with both the running lines and the s-curve simultaneously. Hence the faffery! |
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| Attachment: attach_416_632_guides.jpg 282 | |||
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posted: 17 Nov 2008 02:42 from: Martin Wynne
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Paul Boyd wrote: On my plan the positions of the tracks are already defined, and the crossover needs to fit into what's already there.Hi Paul, In a situation like this, each situation is different and some trial and error is inevitable. But you can usually devise a method which doesn't involve too much faffing. Here the lower turnout clearly has a curviform V-crossing, but I'm not so sure about the upper one. You could temporarily make it a parallel V-crossing. Then snake the return curve into alignment with the other track. Then snake the lower turnout until its fine point lies on the intersection. Peg it at CTRL-4 and adjust the crossing angle (F5) to get a reasonable match in the turnout road. Then make branch track on it should give you the link track. If you attach your .box file, I will have a go at that and see if it makes sense, or it's a rubbish idea.  Difficult to know either way without the dimensions.regards, Martin. |
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posted: 17 Nov 2008 02:51 from: Martin Wynne
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Oh dear. I warned about the grey cells failing.  A few days ago I wrote "distinctly foggy" and now I have just written "in a situation like this, each situation is different". Either it's like it, or it's different! Time for my medication! Martin. |
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posted: 17 Nov 2008 02:58 from: Paul Boyd
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Hi Martin The snake function is one I've never used, so is something I'll have a look into tomorrow evening. Right now, I don't even know what it does! (but I'll find out...) The box file is attached, but I'll have a go with your idea tomorrow. Although what I've done is buildable, it doesn't feel "right". Oh yeah - ignore the isolated bunches of track just below the crossover - that was my first idea for that part of the layout, but is totally wrong for a light railway! I had some medication of the Bushmills variety earlier on  Cheers |
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| Attachment: attach_417_632_locking_road_08_11_16_1728_44.box 204 | |||
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posted: 17 Nov 2008 20:11 from: Martin Wynne
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Hi Paul, Thanks for posting your .box file. I had a go with it and produced a video -- it worked out reasonably well. I changed the upper turnout to 1:8 regular, the lower one then ended up at 1:6.3 curviform. At the standard centres the return curve didn't match the lower track because the upper tracks are not on a constant curve alignment. So I snaked it to come closest just in front of the transition. On reflection I should have increased the parallel centres on the V-crossing options to come closer to full tangency at that location.With the peg at the FP (CTRL-4), it was within the transition zone, so after adjusting the crossing angle on the lower turnout it was necessary to move the transition markers back to the original marks, checking the far end of the exit curve to be sure. This introduced a slight mismatch in the crossover road, cured with a few mm of final snaking on the upper turnout. (Generally it would be easier to have a fixed large radius for the main road of the lower turnout, then make transition to the exit curve beyond.) Here's the video to show the basic idea (15MB, give it time to load): Paul's crossover video regards, Martin. |
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posted: 18 Nov 2008 02:07 from: Paul Boyd
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Hi MartinHere's the video to show the basic idea (15MB, give it time to load):That's brilliant - thanks! I watched through it a couple of times then had a go. I have a bit of tidying up to do, and I'll have a play with the increased track centres as well, plus I want to move the crossover to the right a bit so a chance to do it all again! The F5 'size' function isn't one I've come across before, and I've never played with the parallel crossing, so that's two new ones on me. I think it's time to have another read through your website - now that I have a bit more experience behind me I might understand a bit more! I've also had a play with snaking, roaming and sliding to try to understand the differences. I now do, I think, but whether or not I'll remember which one to use when is another matter! Sorry, I had to turn the music off - it clashed with Vanessa Mae! Cheers |
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posted: 18 Nov 2008 02:16 from: Brian Lewis
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Hi Martin, Is it possible to enlarge to screen area please? What I am viewing is so tiny that it is impossible to see exactly what is going on. Also there appears to be some interference entrained somewhere. I heard, not sure - I wouldn't call it 'music' but it did have a basic rhythm. (But so has our dishwasher...). Regards Brian Lewis |
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posted: 18 Nov 2008 02:56 from: Martin Wynne
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Brian Lewis wrote: Is it possible to enlarge to screen area please? What I am viewing is so tiny that it is impossible to see exactly what is going on.Hi Brian, Sorry, the videos are as large as they can go and still fit on 1024 x 768 screens, which is what many folks are still using. Also the download file size is related to picture size, and this one is already an hour's download for those still on slow dial-up. Also there appears to be some interference entrained somewhere. I heard, not sure - I wouldn't call it 'music' but it did have a basic rhythm. (But so has our dishwasher...).If I leave the videos silent, many users think that their sound system has broken or there is a problem with the file, and that they are missing something important. If the audio track is not to your liking, it is easy to silence it by dragging the volume slider -- it's down at the bottom right. The music is meaningless plinkety-plonk because it's free! Good quality music is very expensive to buy the web publication rights for. Even if it wasn't, the chance of my finding something which everyone likes is of course nil! Also, it's rather wasted if you use the video as intended as a tutorial, stopping and starting it and repeating bits of it. (Click the image, then press the space bar to stop and start, or use the playback buttons, drag the main slider to find different frames.) I suggest that you set the volume slider to zero and then play music of your own choice. Ideally we would have steam or diesel railway sounds of some sort, but so far I haven't found any such which is free. Suggestions welcome, but remember it is background audio, it shouldn't distract you from following the video action. regards, Martin. |
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posted: 25 Jan 2009 11:24 from: Howard
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I have a different requirement for a crossover on diverging tracks. I apologise if I'm hijacking this thread, but I think it does fit here. I'm making a model of Cole station on the Somerset & Dorset. When the line was doubled most overbridges were made into double bridges (as opposed to one for a double track), so the track had to diverge. At the Southern end of Cole, a crossover was placed on the diverging track very close to the bridge. I'm guessing this would be acheived with a curved turnout - although I made a rough go by joining a B6 with a B7! Question 1 - what exactly is a curviform crossing, and should I use one here? Question 2 - am I right in saying it should be a curved turnout? My attempts so far can be seen here http://www.rmweb.co.uk/forum/viewtopic.php?f=9&t=34671#p545202 Howard. |
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posted: 26 Jan 2009 12:00 from: Martin Wynne
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Howard wrote: Question 1 - what exactly is a curviform crossingHi Howard, I have replied to this in a separate topic: curviform V-crossings regards, Martin. |
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