Templot Club Archive 2007-2020                             

topic: 18curved crossings
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posted: 20 May 2007 08:24

from:

Trevor Schofield
 
 

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       It would be really good if it were possible to make a curved crossing by just overlaying two pieces of plain track at the required angle and then pressing a function button to convert them to a crossing. I've been finding that  in making half crossings and converting them to full crossings that the "entry angle" is different from the "exit angle" and so has to be adjused. When the angle of crossing is getting towards 1:2.5 or so, then the curves do not match to produce a smooth passage through the crossing. I'm fairly new to Templot ( just about to retire and new to modelling too) so I'm probably missing something really obvious.
This is a great forum by the way. Very impressed and a little overawed by the depth of knowlege of some of the contributers and their willingness to help, and also the patience of Martin.
It would also be great to have a tutorial/video of a double crossover ( when I was a kid we called them scissors- is this correct?)
Regards Trevor.

posted: 20 May 2007 12:34

from:

Jim Guthrie
 
United Kingdom

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Trevor Schofield wrote: === It would be really good if it were possible to make a curved crossing by just overlaying two pieces of plain track at the required angle and then pressing a function button to convert them to a crossing. I've been finding that in making half crossings and converting them to full crossings that the "entry angle" is different from the "exit angle" and so has to be adjused. When the angle of crossing is getting towards 1:2.5 or so, then the curves do not match to produce a smooth passage through the crossing. ===

Trevor,

I believe that Martin is working on something like this for the next version.

Jim.


posted: 21 May 2007 20:59

from:

Martin Wynne
 
West Of The Severn - United Kingdom

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Hi Trevor,

    > It would be really good if it were possible to make a curved
    > diamond-crossing by just overlaying two pieces of plain track
    > at the required angle and then pressing a function button to
    > convert them to a crossing. I've been finding that in making
    > half-diamonds and converting them to full diamonds that the
    > "entry angle" is different from the "exit angle"

What you are describing is called an "irregular diamond" which arises when the two crossing tracks differ in radius. This most commonly occurs in a double junction, where a curved diverging route crosses the adjacent track of a straight main route.

Such irregular diamonds are in the queue of developments for a future Templot upgrade. In fact the code is already written, and has been for several years. The delay is caused by the need for a suitable user interface and Help texts.

Here's a preview from my development version of Templot, showing a curved ladder comprising all irregular diamonds. This was created with just a few clicks on the tools > make ladder menu item:

irreg_ladder.pngirreg_ladder.png

If your track plan calls for irregular diamonds, I suggest that you leave them as overlaid plain tracks in the meantime, in the hope that this function will be available in Templot by the time that you actually need to build them.    

I'm hoping that the changeover to these new Templot Club forums will reduce my email load, and finally give me time to get on with some of these Templot developments before the grey cells die off completely! :(

regards,

Martin.


posted: 21 May 2007 22:37

from:

Paul Boyd
 
Loughborough - United Kingdom

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Wow!  That really looks worth having.  Ignore your inbox and keep the
grey matter active :)

--
Paul Boyd
http://www.paul-boyd.co.uk/

posted: 21 May 2007 22:44

from:

Martin Wynne
 
West Of The Severn - United Kingdom

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Hi Paul,

   > Wow!  That really looks worth having.

Bear in mind that you can do something similar right now. Just keep clicking the tools > make ladder crossover menu item.

The difference at present is that the diverging track always has the same radius as the tracks which it is crossing -- i.e. the diamonds are "regular", with all crossing angles the same.

regards,

Martin.


posted: 22 May 2007 01:37

from:

Paul Boyd
 
Loughborough - United Kingdom

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    > The difference at present is that the diverging track
    > always has the same radius as the tracks which it is
    > crossing -- i.e. the diamonds are "regular", with all
    > crossing angles the same.

It was specifically the differing radii and irregular diamonds I was
impressed with :)

--
Paul Boyd
http://www.paul-boyd.co.uk/

posted: 22 May 2007 22:10

from:

Trevor Schofield
 
 

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Thanks v much Look forwards to the next update.

Trev



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