Templot Club Archive 2007-2020                             

topic: 397New User - turnout radius
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posted: 4 Apr 2008 20:53

from:

Martin Wynne
 
West Of The Severn - United Kingdom

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Hayfield wrote:
I am used to points being described in inch radius, I understand that I will now work in crossing angles, but is there a simple chart or a rule of thumb which tells me what the equivalent crossing angles are to 36", 48" and 60" radius points please, as this will give me a good reference point.

(I have found F5 which alters length and radius is shown in box). I should play more and ask less questions
Second question on a B7 point which is curved to 500' it shows the main line radius at about 70" (from memory), where can I find out the radius of the other exit please.

Hi John,

As you have found, all the information you need is in the information panel. Click the expand button to see all of it; drag the borders to a convenient size; click the fit to window button to fill the window with data; use the multiple scrollbars to see the information you need without taking up too much screen space.

All the data shown there continually updates to reflect the design changes which you make to the current/control template, for example using the F5 or F6 mouse actions. The idea is to watch this data while making adjustments until you get the result which you want.

It's a good idea to forget about thinking in terms of a "4ft turnout". There are several different radii within a turnout, and they all change with different combinations of switch size, V-crossing angle, V-crossing type, V-crossing entry straight, and other settings. Most significantly of course they also change as you curve the turnout. Now that you are using Templot you will tend to make far more curved turnouts than straight ones, so the radii will all be different.

Here is a very odd size turnout, a B5, which you wouldn't normally think of using -- it is "all switch and no crossing", but it illustrates the different radii within it:

00_b5_radii.png00_b5_radii.png

The read-out at A shows the smallest radius anywhere in the turnout, and flashes red if it is below the limit you have set as a warning.

The read-out at B shows the curving radius in the main road of the turnout.

The read-outs at C and D show the the radius for the switch and the turnout section respectively. You can see that because it is a funny B5 size, D is much smaller than C, and is also the radius showing at A.

Here is another diagram showing the difference between the switch radius and turnout radius:

semcu_sw.gifsemcu_sw.gif

You can read more about this at: http://www.templot.com/martweb/gs_realtrack.htm

There are two more radius figures in the data, if you scroll further down:

00_b5_geo.png00_b5_geo.png

The internal geometrical radius is the "average" radius between the switch blade tips and the nose of the V-crossing (frog).

The external geometrical radius is the "average" radius between the switch blade tips and the exit from the V-crossing (frog). This is often called the substitution radius. When you buy ready-made commercial turnouts it is often these radii which are quoted, and you can see that there can be a big difference between them and the actual radius in the rails.

There is a video showing more about substitution radius -- download:

 http://templot.com/old_videos/subs_rad.exe

regards,

Martin.



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