• The Plug Track functions are experimental and still being developed. Some of the earlier pages of this topic are now out-of-date.

    Some pages of this topic include contributions from members who are creating and posting their own CAD designs for 3D printing and laser-cutting. Do not confuse them with Templot's own exported CAD files.

Short-angle diamond-crossings

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Phil O

Member
Location
Plymouth.
Hi Martin,

Having re-read this topic from the top of the page, you mentioned timbering diamond crossings, would diamonds at 1 in 1.05 be timbered, I would have thought that baulk timbers are more likely, as per the approach to Newcastle.
 
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message ref: 1902

Tony W

Member
Location
North Notts
Hi Phil.
I am not sure at what crossing angle the change from regular timbering to baulk timbering occurs or if there are any hard and fast rules, but I would have thought so too. Martin did say that some timber shoving would be required.
Regards
Tony.
 
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Martin Wynne

Admin
Location
West of the Severn UK
Info
.
Enjoy using Templot?
Thanks.

Please do not send requests for help direct to me via email.

Post your questions on the forum where everyone can see them and add
helpful replies.
@Phil O @Tony W

Hi Phil, Tony,

The REA drawings go down to 1: 1.5 CLM and show cross timbers and conventional chairs. The timbers are 14" wide to accommodate the angled check-rail chairs. At the centre there are two 12" timbers side-by-side.

Below 1: 1.5 CLM the drawings are silent, but in David Smith's GWR book (p.54) there is a drawing of a GWR 1:1 (45-degrees) short-angle diamond on waybeams (baulk timbers).

The current bottom limit in Templot is 1: 1.5 RAM, 1: 1.65 CLM.

In the next Templot update 228a I have taken the limit down to 1: 0.5 RAM (not 1.05 Phil), but only as far as the geometry is concerned, calculating the crossing angles and locations. It's over to you to sort out the timbering and check rails to create a usable template. Quite often such diamonds are buried in yards and docksides so you don't have to be too fussy. :)

This is what you get if you make diamond-crossing at intersection:

short_angle1.png


short_angle2.png


As you can see it falls some way short of being a usable construction template. Over to you.

Above 1: 1.5 Templot adds conventional cross-timbers. But it has never made much of a success of it below about 1: 2.5 because in 00 and EM, etc., the modified gauge and flangeways throw the prototype timbering out of the window -- there isn't enough lead length in which to hide the discrepancies. I'm trying to make some improvements, but finding something which will give good results at all angles for all gauges and scales is tricky. It may have to go to the back of the queue again if I'm to get 228a out in the near future.

n.b. At these angles there is a significant difference between RAM and CLM measures. All Templot working is in RAM.

cheers,

Martin.
 
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message ref: 1904

Paul Boyd

Member
Location
Loughborough, UK
Hi Martin,

Having re-read this topic from the top of the page, you mentioned timbering diamond crossings, would diamonds at 1 in 1.05 be timbered, I would have thought that baulk timbers are more likely, as per the approach to Newcastle.
Martin has to leave us something to do ourselves :)

I'm really looking forward to the new lower limit - I've hit the 1:1.5 limit a few times (but not in this one)

Cheers,
Paul
Baulk.PNG2012-11-24 12-55-50.JPG
 
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message ref: 1905

Phil O

Member
Thread starter
Location
Plymouth.
Martin has to leave us something to do ourselves :)

I'm really looking forward to the new lower limit - I've hit the 1:1.5 limit a few times (but not in this one)

Cheers,
Paul
View attachment 1571View attachment 1573


Hi Paul,

I don't have a problem with shoving timbers, my response was due to Martin sorting out the timbering for 3d printing, when I had the thought of crossings of those sort of angles being baulk timbers/ way beams. A further thought, how did they do it at Retford, before they built the bridge?
 
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message ref: 1906

Paul Boyd

Member
Location
Loughborough, UK
View attachment 1575

Here is a screen shot of a 009 Diamond crossing I did for a colleague although he ultimately never used it.
It took a lot of partial templates to create this.
View attachment 1576
Regards
Tony.
Just for fun, I did something similar for the standard/narrow gauge crossing at Porthmadog, even though I had no intention of using it! Now I think about it, I’ve never tried the Make diamond function with different track gauges!
 
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message ref: 1908

Martin Wynne

Admin
Location
West of the Severn UK
Info
.
Enjoy using Templot?
Thanks.

Please do not send requests for help direct to me via email.

Post your questions on the forum where everyone can see them and add
helpful replies.
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message ref: 1909

Derek

Member
Location
UK, Midlands
On the subject of interesting formations, for those who haven't seen Simon Glidewell's work of St Mary Hoo, this was a good bit of trackwork. Though I don't think he ever managed to make it work electrically.

I am sure he won't mind me copying this out of his facebook page, but if he does see it and objects of course I'd delete it. I wonder what happened to him- an incredibly talented modeller who suddenly disappeared.

SMH231221.jpg
 
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message ref: 3396
Location
Sandbach, Cheshire
Info
Builder of Finescale Signals in 2mm scale to 7mm scale, Trackwork, Turnouts and Layouts.
Some years ago I built a 90 degree double track one. I did point out to the customer that it was going to be difficult to change the polarities of the various bits. There wasn't any real alternative to achieving what he wanted to do. In the end, he wasn't too concerned as it was only a over a short distance and was minded to leave it unpowered as the locos would easily traverse it without problem being mainly of the large variety (GWR ones and North American). Tricky, I might have a photo.
 
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