Templot Club Archive 2007-2020                             

topic: 851N Scale Curved Turnout
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posted: 3 Jun 2009 09:03

from:

andrew
 
 

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Could you please help me in the following if possible.

I am trying to build a Curve Point  in N-NMRA:
andrew_mcculloch1.gifandrew_mcculloch1.gif
Can I use one of the programs (new template (quick set)) and adjust the turnout?

Thank you for your time.

Andrew

posted: 3 Jun 2009 19:52

from:

Jim Guthrie
 
United Kingdom

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andrew wrote:
Could you please help me in the following if possible.

I am trying to build a Curve Point  in N-NMRA:
andrew_mcculloch1.gifandrew_mcculloch1.gif
Can I use one of the programs (new template (quick set)) and adjust the turnout?

Thank you for your time.

Andrew
Andrew,

I've just had a quick try with the two radii of 305mm and 355mm and I don't think you will get a workable solution.  Your radii are a bit too close in value and you would finish up with a very long turnout with a very high value crossing number.

I tried by setting out a piece of plain track to 355mm radius then adding a turnout to it and increasing the crossing angle number and watching the minimum radius value.  At 1:15,  the minimum (inner) radius was about 272mm. When I tried increasing the angle to 1:16 and upwards,  the inner radius didn't increase,  and when I tried 1:19,  Templot admitted confusion with my input,  and opted out. :D In any case,  a 1:19 curved crossing would be a ticklish crossing to make in N and to get it running well.

Jim.

posted: 3 Jun 2009 21:51

from:

wcampbell23
 
Hamilton, Scotland - United Kingdom

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Hi Andrew

It would help if you give us some idea of what is intended to happen to each exit track.

Will they continue to diverge or become parallel for example?

Regards

Bill

posted: 3 Jun 2009 23:17

from:

John Preston
 
Lethbridge - Canada

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Hi  Andrew,
Based on your drawing, this may be what you are looking for - see box file attached.
It is a left hand D-13 turnout with a curviform v-crossing to Martin's preset N-NMRA scale and gague.  I created it first by selecting the scale and gauge, then using F6 to set the main road radius to 355 mm.  After that, set the V-crossing to "curviform" and use F5 to increase the minimum radius to your required 305 mm.
Hope this helps.

John P

Attachment: attach_572_851_nnmra.box 245

posted: 4 Jun 2009 00:06

from:

John Preston
 
Lethbridge - Canada

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Hi again Andrew,

The Turnout is actually a D - 11.  This, for me is another "Senior Moment" where my fingers work faster than the grey matter up top (or wherever it is!)

Regards

John P

posted: 4 Jun 2009 00:32

from:

Martin Wynne
 
West Of The Severn - United Kingdom

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Hi Andrew,

Thanks to Jim, Bill and John. However, I think you are looking for a "geometrical fit" here, i.e. tangency between the two radii. So the dimension you need to watch in F5 is the external geometrical radius (substitution radius) at the bottom of the info panel. Also, having set this (it turns out to be a D-11.48, say D-11.5), you must extend the approach track to the tangency point (EGTP), which in this case adds an extra 3 sleepers to the switch front:

n_for_andrew.pngn_for_andrew.png

There is a video all about substitution radius in the video list.

regards,

Martin.

posted: 4 Jun 2009 10:26

from:

Jim Guthrie
 
United Kingdom

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My senior moment is forgetting about curviform :D

I did get similar results to Martin by inserting a turnout in a 355mm curve with a curviform 1:11.5 crossing.

Jim.



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