Templot Club Archive 2007-2020                             

topic: 3304Setting the bend radius for obtuse crossings
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posted: 9 Jul 2018 07:33

from:

richard_t
 
Nr. Spalding, South Holland - United Kingdom

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Is it possible to set the bend radius for obtuse crossings in a similar manner to setting the knuckle bend radius?



The NERA booklet "Standard Railway Equipment - Permanent Way, 1926", suggests this is 16" multiplied by the crossing angle for angles between 1:4 and 1:8. It also seems to apply to the check rail as well.



Thanks

Last edited on 9 Jul 2018 14:48 by richard_t
posted: 9 Jul 2018 15:31

from:

Martin Wynne
 
West Of The Severn - United Kingdom

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Hi Richard,

The bend radius for K-crossings isn't currently supported. It's somewhere on my to-do list.

Of course, now that the code is open-source, it can be on everyone else's to-do list too. :)

It would be part of the journey over the years from Templot templates being simply construction aids, to being full descriptive drawings.

Bear in mind that for wider than scale model flangeways, for good tracking through K-crossings the check rail bends need to be as sharp as possible, to maximize the checked length. This differs from the situation with the wing-rail knuckle bends in V-crossings.

Fortunately, unlike the wing rails,  REA check rails are always vertical, which makes it much easier to make sharp bends than in inclined rail.

cheers,

Martin.

posted: 10 Jul 2018 08:32

from:

richard_t
 
Nr. Spalding, South Holland - United Kingdom

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Thanks Martin

With so much else going on here, I'm refraining from looking at the Templot codebase, however tempting the prospect is.



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