Templot Club Archive 2007-2020
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posted: 28 May 2010 22:27 from: Bill Fay click the date to link to this post click member name to view archived images |
I have gradually been teaching myself Templot and learning something of track geometry but now I am stumped. Some while ago I obtained from Tony West (GCRS Model Steward) a copy of an 1895 drawing of an MS&L 1 in 8 through crossing. I scanned this (Unfortunately two pages with no overlap) into Templot and adjusted the size and twist to match the basics to a Temploted 1:8 crossing. I have got this as near to correct as I can. It is obvious that there are imperfections in the drawing, partly due to photocopying (probably a number of times) and also inaccuracies in the drawing itself. My first problem is that the 2 crossing fine points and the center of the crossover should line up by the basic laws of geometry, unless I am missing something. For the moment I have put this problem to one side and concentrated on the turnout. Ignoring the sleepers, wing rails and check rails (which I think I can handle) I have tried constructing a turnout to match the drawing. As I don't know if it should be a straight, curved or semi curved switch I have made all three. I must admit that in my ignorance my methods have been largely hit and miss, guided a little by Templot Companion. Attached is the relevant Box file. I will also post the Shape file and the two scans. I would be grateful for any advice to help me match the track to the drawing as closely as possible. Many thanks, Bill |
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| Attachment: attach_800_1134_gcr_1in8_through_cro_10_05_27_1753_52.box 212 | |||
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posted: 28 May 2010 22:29 from: Bill Fay click the date to link to this post click member name to view archived images |
Now attached is the Shape file. Bill |
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| Attachment: attach_801_1134_gcr_1in8_through_cro_10_05_25_1213_10.bgs 216 | |||
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posted: 28 May 2010 22:36 from: Bill Fay click the date to link to this post click member name to view archived images |
Oh dear that's screwed it - my scans are apparently .bmp (whatever that is!) and I can't send them. Bill |
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posted: 29 May 2010 00:42 from: Martin Wynne
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Hi Bill, I have now added BMP files to the list of allowed attachments. However, BMP files tend to be very large and may exceed the size limit of 6 million bytes. The usual practice is to ZIP them for transmission, as they then become very much smaller. If they exceed the size limit and you don't have a zip compression program, please send them to me by email to martin@templot.com I will then upload them for you. On the other hand, if you can convert them to PNG format in an image editor program, you can then attach them easily or upload them to the Image Gallery instead. I notice that you are using the unusual scale of 1:50 (6.1mm/ft). Are you actually modelling in that scale? regards, Martin. |
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posted: 29 May 2010 10:40 from: Bill Fay click the date to link to this post click member name to view archived images |
Martin, Many thanks. I will obviously have to learn about zipped files! However, being purely track plans they are not too big; the largest being about 650KB. My moddeling attempts are actually 2mmFS. For this exercise I wanted to stick to a true scale, in order to be as accurate as possible and not become diverted by wing rail gaps etc. being sightly off - 1:50 chosen largely at random, it sounded like a proper engineers scale! First track scan attached. Bill |
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| Attachment: attach_802_1134_GCR_1in8_Through_Crossing_1_twisted.bmp 250 | |||
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posted: 29 May 2010 10:41 from: Bill Fay click the date to link to this post click member name to view archived images |
Second and last plan attached. Bill |
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| Attachment: attach_803_1134_GCR_1in8_Through_Crossing_2_twisted.bmp 253 | |||
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posted: 29 May 2010 17:06 from: Martin Wynne
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Hi Bill, Thanks for uploading the scans. It's a timbering and chairing sketch rather than a track geometry drawing, so some approximations are evident. Note for example the switch blade tip shown in fresh air overhanging the first slide chair, which I'm sure wasn't the case. To make the diamond fit exactly as it stands, the GCR would need to be using closer track spacing than 6ft way.  Also it seems to fit better as 1:8 RAM rather than the usual CLM angle. The turnout is a little odd, having a much longer switch than a typical 1:8 turnout. I got the best fit as a curved switch, with a generic pattern V-crossing (1:8 RAM). 2_291123_050000000.png  (I find it convenient to work with the images transparent in the "bright night" colour scheme.) .box file attached. I have done the timbering for the switch to a best match, but over to you to customize the V-crossings and full timbering. It's interesting to note only the one long timber (20ft), where the GWR for example might have more than a dozen long timbers in such a crossover. Custom switch data: _________________ Dimensions are in FULL-SIZE prototype INCHES, with model conversions at 6.1 mm/ft. Unit angles are RAM. This switch is a CURVED pattern switch: lead length to heel (incl. planing) = 276.0 ( 140.21 model mm ) (23ft) offset at the heel (heel spread) = 7.25 ( 3.68 model mm ) switch radius = 18000.0 ( 9144.0 model mm ) (1500ft) stock-rail joint to toe = 45.0 ( 22.86 model mm ) length of switch-rail (blade) = 276.0 ( 140.21 model mm ) (23ft) length of stock-rail from joint = 288.0 ( 146.3 model mm ) (24ft) deflection angle at blade tip = 1 : 53.78 planing length (along stock-rail) = 124.7 ( 63.35 model mm ) heel angle 1 : 29.46 ------------------- Timber spacings (to timber centres) : switch-front is sleepered: spacing back from toe (blade tips) to first front sleeper (J1) = 32.0 ( 16.26 model mm ) spacing back to next front sleeper (J2) = 0 ( 0 model mm ) spacing back to next front sleeper (J3) = 0 ( 0 model mm ) spacing back to next front sleeper (J4) = 0 ( 0 model mm ) spacing back to next front sleeper (J5) = 0 ( 0 model mm ) spacing forward from toe (blade tips) to first timber (S1) = 3.0 ( 1.52 model mm ) spacing forward to next timber (S2) = 30.0 ( 15.24 model mm ) spacing forward to next timber (S3) = 33.0 ( 16.76 model mm ) spacing forward to next timber (S4) = 33.0 ( 16.76 model mm ) spacing forward to next timber (S5) = 33.0 ( 16.76 model mm ) spacing forward to next timber (S6) = 33.0 ( 16.76 model mm ) spacing forward to next timber (S7) = 33.0 ( 16.76 model mm ) spacing forward to next timber (S8) = 33.0 ( 16.76 model mm ) spacing forward to next timber (S9) = 31.0 ( 15.75 model mm ) spacing forward to next timber (T1) = 28.0 ( 14.22 model mm ) ____________ v: 0.91.c © regards, Martin. |
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| Attachment: attach_804_1134_msl_gcr_1in8_ladder.box 203 | |||
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posted: 29 May 2010 18:11 from: Bill Fay click the date to link to this post click member name to view archived images |
Martin, That's wonderfull and I am extremely grateful for your help and patience. I will study what you say and have done and will learn from it. That is both the joy and frustration of this hobby - the more one learns the more one realises one's ignorance! Many thanks, Bill |
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