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                                       Rail Joint and Timber Changes on Diamonds
     
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1st message | this message only posted: 6 Jun 2017 10:52
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from:
Godfrey Earnshaw
 

 

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I was creating a 1 in 7 moveable K-crossing diamond in 4 -SF.
I started with plain track then template> insert diamond in plain track.

This created a half-diamond with fixed K-crossing. However, I wanted to have a moveable K-crossing.

So, real> K-crossing options> moveable K-crossings.

At this point I noticed that the main-road and diagonal-road stock rail joints had moved toward the vee and consequently the K numbered timbers had increased in quantity. However the T numbered timbers had decreased in quantity to just two which were overlapping.

I am not sure whether to reduce the T to one and adjust it's position slightly or try to space the two timbers a little.

I tried the same in P4 and there is a similar change in rail joint position although there are 4 rather than two T timbers

My main question is, why is there a change in the position of the rail joints?

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2nd message | this message only posted: 10 Jun 2017 17:02
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from:
Martin Wynne
West Of The Severn, United Kingdom



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

Post your questions on the forum where everyone can see them and add helpful replies.
Godfrey Earnshaw wrote: My main question is, why is there a change in the position of the rail joints?Hi Godfrey,

You have opened a can of worms which I have been trying to keep the lid on for years. :)

Just trying to explain it is going to create a page full of ifs and buts below.

The prototype rail lengths and timbering for K-crossings varies a lot, and for movable K-crossings (switch-diamonds) prototype info is almost impossible to find for angles shorter than about 1:9. There are also significant differences between bullhead and flat-bottom designs.

For Templot I tried to simplify it by providing:

1. some default settings which look about right in most cases, and

2. the option to set custom rail lengths if you know what you want.

But some of this is still a work-in-progress on my to-do list. My excuse is that I'm still waiting to find some definitive prototype information.

The rail joints change because for movable K-crossings, Templot sets a single default wing rail length of 36ft (total). This differs from the defaults for fixed K-crossings, which vary according to the K-crossing angle.

You can move the rail joint by going to

 real > K-crossing options > customize K-crossings > K-crossing wing rails... menu item.

Click the ? info button on the dialog for full details.

Note that you are entering the full length of the rail, across both half-diamonds. i.e. double the length on each half-diamond template.

then

1. For a fixed K-crossing Templot will adjust the timbering to suit (as far as possible), with closed up timbers adjacent to the rail joint.

BUT  for fixed K-crossings the above applies only if you have set the real > timbering > half-diamond timbering > fixed K-crossing : timber-spacing as prototype menu option.

If you choose the as model option (recommended for all except P4, S7, etc.), Templot will adjust the timber spacing to suit the flangeway gaps so that the point rail tips are properly supported on a timber, and ignore the prototype rail joint positions and timber spacings.

or

2. For a movable K-crossing Templot leaves the timbering unchanged. This is because for the movable point rails the timber-spacing must be specified to suit the special K-crossing switch chairs, and I don't (yet) have the prototype info for that for every K-crossing angle. You are on your own to shove the timbers to match your required prototype.

BUT  for movable K-crossings the above applies only if you have set the real > timbering > half-diamond timbering > movable K-crossing : timber-spacing normal menu option.

If you choose the as turnout switch option, Templot will adjust the timber spacing to match the currently set switch for this template. This is primarily intended for use when using an irregular half-diamond to represent a symmetrical Y-turnout.

regards,

Martin.

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3rd message | this message only posted: 11 Jun 2017 05:59
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from:
Godfrey Earnshaw
 

 

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Thank you Martin,
Now I understand the problem I feel much happier. I have been trying to find photographs, without much success. However, I will go ahead feeling more confident knowing that the rules are not clear but there are answers in the real world.
Sorry about the can of worms.
Cheers Godders.
P.S. I shall also play a lot more with the settings that you have pointed out.
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This is topic ID = 3036     Page created at 18:25 (local time)  
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