Templot Club Archive 2007-2020
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posted: 16 Sep 2007 23:47 from: leflep
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I am trying to make a 90 degree 'diamond' crossing. I make a diamond crossing and then go to 'Template' - 'V crossing options' - 'Other' and type in 1:1 for the crossing angle. This is rejected as an invalid request. Is there another way? TIA Peter |
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posted: 17 Sep 2007 07:49 from: Martin Wynne
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leflep wrote: I am trying to make a 90 degree 'diamond' crossing. I make a diamond crossing and then go to 'Template' - 'V crossing options' - 'Other' and type in 1:1 for the crossing angle. This is rejected as an invalid request. Is there another way?Hi Peter, Sorry, 90-degree and similar short-angle crossings are not directly supported in Templot. They are unusual on the prototype -- designs vary a lot and don't use conventional chairing for the vees. If you have a prototype drawing (there is a 1:1 drawing in the GWSG GWR track book, p.54 -- see below) you can create one using partial templates and much timber shoving. By the way, a 90-degree crossing is 1:0 angle -- a 1:1 RAM crossing is 45 degrees. The current bottom limit in Templot is 1:2. Below that the timbering algorithm falls over. I intend to reduce the limit to 1:1.5 in a future pug, but it will still need manual timbering intervention. If you are familiar with geometry and computer programming I'm sure you will see the problem with a 1:0 angle and hear the alarm bells ringing!  regards, Martin. |
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posted: 17 Sep 2007 20:03 from: Jamie92208 click the date to link to this post click member name to view archived images |
Hi Martin I've got a short angle crossing to construct. Is it possible for you to post a sample timbering for say a 45 degree one so that I have some idea of roughly how to shove the timbers. Jamie Guest |
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posted: 17 Sep 2007 23:13 from: Martin Wynne
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Jamie92208 wrote: I've got a short angle crossing to construct. Is it possible for you to post a sample timbering for say a 45 degree one so that I have some idea of roughly how to shove the timbers.Hi Jamie, The best I can do is scan the drawing from David Smith's excellent GWR book. This is a 1:1 short-angle crossing: short_angle_crossing.jpg  © GWSG Bear in mind that this is specifically GWR and BR(W) -- sorry I don't have any information for other companies. The "main line" rails are on through baulk timbers (waybeams) held to gauge with transoms and tie-bolts. The "branch line" baulk timbers are rebated into the main timbers. The rails are vertical in the crossing, requiring a twist in the rail at each approach and special check rail chairs. regards, Martin. |
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posted: 17 Sep 2007 23:45 from: Jamie92208 click the date to link to this post click member name to view archived images |
Thanks for that Martin. It's part of Lancaster Green Ayre shed which hopefully will make it onto the circuit in 7mm gauge. Jamie |
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