Templot Club Archive 2007-2020
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posted: 8 Nov 2010 14:17 from: richard_t
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Hello I've managed to find another 1.5 meters for the fiddle yard for Manchester Windmill Street, and "permission" to route two of the lines through the camila bush rather than the one I currently thought I'd be able to do. This means that I can, eventually, have the two running lines out to the garden. I still want a siding leading to a cassette for the short term. As the siding lengths can remain the same I have more space to slew the lines from the exit of the garage door to behind the bush. I wondered if there is a simple-ish way, of converting a slew to a set of transition curves. My attempts have been a bit rubbish so far. The reason for the conversion is that I need to put some turnouts on the slew and I find this easier to do with transition curves than with slews. The distance between the tracks centers are 555.8mm and the distance I have to play with is 4530mm, all in Scale 7. The attached box is the fixed bits of the fiddle yard. The track centers coming into the fiddle yard (to the right) are 83.62mm, and ideally the exit on the left would be standard track centers. Any help, as usual, much appreciated. |
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| Attachment: attach_938_1281_mws_fiddle_yard_10_11_08_1415_38.box 268 | |||
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posted: 8 Nov 2010 16:59 from: Robert Preston
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Hi, I don't know if the attached is what you have in mind. I put fixed-radius curves on fiddle road #1 and up main. Extended them, curved them to about 6m, so they nearly touch and then did peg align make transition. I then extended each end of the transition curve to meet fiddle and main and deleted the temporary fixed rad curves. Repeat for fiddle #2 and down main. Robert Preston |
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| Attachment: attach_939_1281_mws_fiddle_yard_10_11_08_1604_00RP.box 239 | |||
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posted: 8 Nov 2010 17:13 from: Martin Wynne
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richard_t wrote:I wondered if there is a simple-ish way, of converting a slew to a set of transition curves. My attempts have been a bit rubbish so far. The reason for the conversion is that I need to put some turnouts on the slew and I find this easier to do with transition curves than with slews.Hi Richard, Here's a quick bit of video (ignore the caption about a background scan, I don't know where that came from  ):Sorry it's so scruffy (it takes about 5 minutes to record this stuff, and another 2 hours to edit out all scruffy frames and mouse fumbles  ).The important point to note is that before making a transition from an existing transition -- the peg on the original transition template(s) must be at the relevant end. This is actually a damn nuisance, because that is nearly always the opposite end from the end where the peg is useful. So there is much swapping of it to and fro before and after making the transition. I'm intending to find an alternative way of doing this. Otherwise Templot is likely to say that a transition is impossible. The template boundaries can of course be moved along (i.e. F4 on each template) to suit any turnouts you wish to insert, provided they don't break into the actual transition zones. For anyone wishing to download the video for replay without an internet connection, here is the link (right-click and Save Link As...): http://www.templot.com/martweb/videos/flash/trans_from_slew.swf regards, Martin. |
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posted: 8 Nov 2010 17:36 from: Martin Wynne
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Hi Robert, Our messages crossed.  Your reverse curve is gentler than mine, at the expense of no easement transitions from the straight sections at each end. All the transition zone lengths can of course be adjusted to suit. The length of the "make transition" zone at the reverse curve is determined by how far apart the centre-lines are set initially -- see the current "handy hint" at the top of this page. Some trial and error is usually needed to get the most pleasing result. regards, Martin. |
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posted: 8 Nov 2010 17:57 from: Robert Preston
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Thank you Martin, I realised my solution didn't have transition curves but I didn't know how to get peg align to work with transitions. I have sweated blood and tears over using peg align to make a transition between transitions (if you follow me), but I clearly hadn't read all your instructions properly because I didn't know you had to have the peg at the "business end" of the transition. I've just tried Richard's example again and it worked beautifully! I look forward to a new era in using transition curves. Robert |
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posted: 10 Nov 2010 12:14 from: richard_t
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Many thanks both. The video was fine, and I'm not sure why I didn't work it out for myself. I blame my post-op drugs making me more dopy that usual :-D | ||
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