Templot Club Archive 2007-2020
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posted: 12 Feb 2009 11:36 from: Scott Willis click the date to link to this post click member name to view archived images |
Dear all I have just been trying to construct a Single Slip which I have attached a copy of. The Slip has been drawn in S-Scale and due too the fairly tight radius it is on I have had to make it quite large (1:13.5). When constructing a large Diamond Crossing/Slip, anything above 1:10 and Templot doesn't produce the required K-Crossings. Can anyone tell me how to produce these? Regards Scott |
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| Attachment: attach_487_731_SW_SingleSlip.box 356 | |||
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posted: 12 Feb 2009 12:03 from: Martin Wynne
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Scott Willis wrote: When constructing a large Diamond Crossing/Slip, anything above 1:10 and Templot doesn't produce the required K-Crossings. Can anyone tell me how to produce these?Hi Scott, I strongly recommend that you don't try to use fixed K-crossings at 1:13.5 angle, especially on such a tight curve. Derailments are inevitable. Fixed K-crossings are limited to 1:8 max, and then only in straight track. Templot is drawing a switch-diamond instead (i.e. movable K-crossings) because that is what is required in this situation. Here are a couple of images to help explain.These are switch-diamond-crossings, but you can add slip roads to make them into slips, just as for fixed K-crossings: switch_diamond_10bh.jpg  © PWI switch_diamond.jpg  © PWI Notice that in a flat-bottom switch-diamond (lower photo) the switch tips (points) are carried on two separate timbers. In a bullhead switch-diamond (upper drawing) both switch tips share a common wider centre timber. For more information about all this, click: topic about switch-diamonds . Ask again if you need more. regards, Martin. |
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posted: 12 Feb 2009 12:27 from: Martin Wynne
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p.s. Scott, Here is an excellent picture from Mick Nicholson showing a flat-bottom double-slip with movable K-crossings: fb_movablek_dslip.jpg  © thanks to Mick Nicholson regards, Martin. |
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posted: 12 Feb 2009 13:01 from: Stephen Freeman
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Hi, I've built 2 of these curved double slip in O-FS for a customer and one in P4, if anybody is interested I can look out the boxfiles for same. |
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posted: 12 Feb 2009 13:17 from: Scott Willis click the date to link to this post click member name to view archived images |
Hi Martin Thanks for the information, it just goes to prove that you never stop learning. I take it, except for adjusting timbers/check rails, that my Single Slip is fine the way it is? I am modelling the North British Railway c1909-1913. Can I assume that Switch Diamonds were around during this period? I know Jim Guthrie recently asked a similar question but I was unsure of the outcome. Regards Scott. |
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posted: 12 Feb 2009 14:21 from: micknich
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I can't speak for the North British but the North Eastern was using them by c1910. Mick Nicholson. | ||
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posted: 12 Feb 2009 14:58 from: Martin Wynne
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Scott Willis wrote: Thanks for the information, it just goes to prove that you never stop learning. I take it, except for adjusting timbers/check rails, that my Single Slip is fine the way it is?Hi Scott, Your half-diamond templates contain several unwanted bonus timbers -- real > timbering > bonus timbers > remove all menu item. The "shorten check rails for slip" function doesn't work for 1:8 and flatter, so you need to do this manually to suit your prototype. At present you have some conflict with the switches. For a 1:13.5 slip you could probably ease the minimum radius in the slip road by changing to 1:48 switches instead of 1:40. I haven't prepared a ready-made slip switch for that in the list, but it's easy to change. Put the peg on the toe of the existing switches (CTRL-2) and then change to an 18ft straight heel switch. Then do tools > make slip road and curve it to fit between them in the usual way. Obviously if you have a drawing for an NBR switch at around 1:48 planing, create a custom switch to match and use that instead. The NER has a 20ft switch with 1:50.5 planing which might suit well. Details are in the NERA track book. regards, Martin. |
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posted: 12 Feb 2009 15:55 from: Jim Guthrie
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Scott Willis wrote: I am modelling the North British Railway c1909-1913. Can I assume that Switch Diamonds were around during this period? I know Jim Guthrie recently asked a similar question but I was unsure of the outcome.Scott, I've since had some contact with other members of the Caledonian Railway Association and details of the pre-Grouping Scottish track are very scarce. The drawing of the NB turnout/diamond/slip seems to be the only drawing known to be available and other information seems to be being gleaned from photographs. Like you, I'm contemplating a slip with a large (in number) crossing although at 1:9-ish, it's just about within the bounds of using "K" crossings if I do something like raising the central check rails to increase the checking at the "K" gaps. But from the information about the NER having switched diamond details from about the first decade of the last century, it's a fair bet that other railways could have copied them if they had required similar formations. There seemed to be a fair exchange of information between pre-Grouping railway companies so the NB using similar formations to its southern ally is not unbelievable. I would build the slip as a switched diamond and wait on some expert proving you wrong - it's always been an acceptable method of digging information out of unwilling sources.  Jim. |
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| Last edited on 12 Feb 2009 15:57 by Jim Guthrie |
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posted: 12 Feb 2009 17:27 from: Stephen Freeman
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Right, here is the box file that includes the ones I did in 0 Gauge - did it a few years ago now, so there may be a few things that you could pick at but it got the job done. |
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| Attachment: attach_492_731_final_09_02_12_1822_14.box 348 | |||
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posted: 12 Feb 2009 17:28 from: Scott Willis click the date to link to this post click member name to view archived images |
Hi guys Many thanks for the comments, they have helped a great deal. I'll play around with the slip to get it right and report back. Regards Scott |
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