Templot Club Archive 2007-2020                             

topic: 2851Turnout types
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posted: 28 Feb 2016 15:29

from:

Martion Elsworth
 
 

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Working in 2mmFS I’ve been trying to fathom out why milled-base EasiTrac templates are shorter than those for Versaline turnouts (based on C&L templates). It appears that EasiTrac uses a “regular” setting and Versaline a “generic”. The end result is that the Versaline has one more timber in the closure rail zone between switch and crossing (which are the same in both types). Even though I’ve read the notes about crossing types I can’t see any obvious need for the extra sleeper – in fact I would have thought the regular crossing closure would be the longer of the two. Can anyone offer a simple explanation for what’s going on please.
Martin

posted: 28 Feb 2016 19:59

from:

Martin Wynne
 
West Of The Severn - United Kingdom

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Martion Elsworth wrote:
Even though I’ve read the notes about crossing types I can’t see any obvious need for the extra sleeper – in fact I would have thought the regular crossing closure would be the longer of the two.
Hi Martin,

A regular-type V-crossing has a length of entry straight in front of the crossing. Generic and curviform V-crossings do not have any straight section in front of the crossing. See:

 http://www.templot.com/martweb/gs_realtrack.htm#xing_types

Note that "entry-straight" refers to the geometrical alignment of the rails, it is not related to the physical length of the wing rail front between the rail joint and the crossing. That stays the same according to the prototype being modelled, regardless of whether the V-crossing geometry is regular, generic or curviform.

Although at first it seems counter-intuitive, the presence of an entry straight shortens the closure space between the heel of the switch and the front of the V-crossing.

Using the SHIFT+F11 mouse action, you can adjust the length of the entry straight and watch the turnout getting shorter as the entry straight gets longer. This adjustment is sometimes useful if you need to shorten a turnout a fraction without changing any other settings.

As you shorten the turnout, you can also watch Templot adjusting the number of timbers filling the closure space. Templot uses as few timbers as is possible without exceeding the maximum fill spacing which you have set at real > timbering > timbering data... menu item: 

2_281421_480000001.png2_281421_480000001.png

Sometimes if the calculated spacing is close to the limit, only a small change in that setting is needed to increase or reduce the number of timbers.

You can see the actual spacing achieved, using the shove timber functions. Here in this example I first selected timber T4 (by clicking on its number), and clicked the set zero button. I then selected timber T5, and the read-out shows the spacing from T4:

2_281421_480000000.png2_281421_480000000.png 

You can see that it was 27.52 inches, quite a lot closer than the usual maximum setting of 30 inches. But using one fewer timbers would have exceeded that maximum. If I felt there were too many timbers, I could have tried easing the maximum fill spacing to maybe 31 inches, with this result:

2_281448_080000000.png2_281448_080000000.png

You can see that there is now one fewer timbers, and Templot has just managed to stay inside the set maximum spacing, at 30.96 inches.

I often read on other forums that Templot does this, or Templot does that. But of course for the most part, Templot does only what you tell it to do by means of the various settings.

I'm sorry, I don't know anything about the EasiTrac or Versaline templates, so I can't comment on why they differ. Generally it is better to print your own templates using Templot, so that you are not restricted to having only straight turnouts and can just as easily print one on a gentle curve, positive or negative, and with whatever timber spacing you want.

regards,

Martin.



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