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1st message | this message only posted: 11 Jul 2019 13:04
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from:
Chris Hillier
 

 

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Hi all,

New user here.

I am getting to grips with simple LH or RH points and curved ones BUT…… How do I create a non-symmetrical Y point?

I’m trying to create one with a 60” (1523mm) Right Hand radius (Main) and a 66” (1676mm) Left Hand radius (Branch)? I’m totally totally flummoxed!

I’ve looked at various examples from the past but either the links to extra info are missing or as in one example – Method 3 (posted: 13 Oct 2012 09:02) – “Start with two lengths of curved plain track crossing over each other, ….“ and using “…. menu, click peg/align tools > make diamond-crossing at intersection menu item.” - nothing happens??

I guess the instructions may be out of date for the version I’m using? Some notes mention symmetrical turnouts, but not non symmetrical Y’s.

I was using Templot V 2.19.b (but have just updated to 2.23b ) and drawing using 0-MF gauge.

It’s for a small Southern Region goods yard I’m planning on building with hand built points, ply sleepers/Exactoscale/C&L components, etc. as Peco just doesn’t work for me.

I’m either starting in the wrong place, have missed a vital step or three or haven’t found the right message yet???

Any help would be much appreciated as I’ve just got totally confused!

Kind regards,

Chris.

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2nd message | this message only posted: 11 Jul 2019 13:10
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from:
Chris Hillier
 

 

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Sorry all, not sure why the format is all over the place, looked ok in preview???
Chris.
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3rd message | this message only posted: 11 Jul 2019 13:44
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from:
Martin Wynne
West Of The Severn, United Kingdom



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Chris Hillier wrote: Sorry all, not sure why the format is all over the place, looked ok in preview???
Chris.
Hi Chris,

Welcome to Templot Club. :)

I have fixed it for you. I'm assuming you copied/pasted from a word processor? That doesn't work too well in some browsers. If you want to prepare your text in advance, it's better to use Windows Notepad or some other plain text editor, and copy from there.

Can you clarify what you mean by a non-symmetrical Y-turnout? Templot doesn't directly support split-deflection switches -- they have been on my NOD list for years, as several here will testify. :)

But they can be quite successfully improvised by modifying a half-diamond template and adding a separate switch front. There is a topic on here about that, I will post the link shortly when I have found it.

However, I suspect that is not what you want. I imagine that what you are looking for is probably an ordinary handed turnout with contraflexure. That just means taking an ordinary turnout and applying a negative curving radius. There are about 1000 of those on the prototype for every split-deflection turnout.

I will post what I think you want shortly, just having some lunch.

cheers,

Martin.

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4th message | this message only posted: 11 Jul 2019 15:06
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from:
Martin Wynne
West Of The Severn, United Kingdom



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Hi Chris,

Here is what I think you may be looking for:



Starting with an ordinary Left-hand turnout in 0-MF, I set a 9ft switch for such a short turnout as there are no REA switches short enough. That's at template > switch settings... menu item. The main road is set to a negative radius of -1524mm (60") as required.

For a such a short turnout it is almost certain that you want a curviform V-crossing -- click the indicator to C. More about that at:

 http://templot.com/companion/real_track.php

Then adjust the V-crossing angle (F9 mouse action) until the required turnout radius is showing in the info panel. The answer was 1:3.57 RAM for the nearest to1676.4mm without going into 3 places of decimals on the crossing angle.

On the prototype it would be 1:3.5 or 1:3.75 but that might vary your turnout radius more than you want.

Ask again if you need more.

I have attached the .box file below. I left a bit of approach and exit track on it to better show the ruling curve in the main.

I will post an actual split-deflection Y-turnout later.

cheers,

Martin.

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Attachment: 0_mf_9ft_3p57_for_chris.box (Downloaded 35 times)
 
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5th message | this message only posted: 11 Jul 2019 16:58
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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.
Hi Chris,

Now here instead is what you specifically asked for, a split-deflection Y-turnout. :)

Note that there is a switch deflection in both roads, so this is not a turnout which can be used in a fast running line -- there would be a speed restriction over both roads. The effective deflection is only 1:48 each way, but that's still not something you want to hit at 60mph.



Despite appearances, this is implemented using an irregular half-diamond template, not a turnout. I set the K-crossing angle to 1:24 -- it could be shorter, but that looks about right.

Then adjusting the V-crossing angle as before to get your required radius gave a nearest V-crossing angle of 1:3.42

I blanked up to the switch toe and put the peg on the split deflection position.

Then I pegged it onto a short 2-timber length of straight plain track to form the switch front. The two sleepers were widened to 12" timber width in the shove timbers. In many cases the switch front could be part of an existing straight template.

Your radii are sufficiently similar that a 50-50 split is close enough, but if the radii were significantly different you might want to rotate it a fraction on F8 to even up the deflections.

I changed the half-diamond timbering setting to replicate a 9ft turnout switch instead of a switch-diamond.

More about all this at:

 http://85a.co.uk/forum/view_topic.php?id=2768&forum_id=6

p.s. that topic is dated 29th October 2015. Anything about symmetrical turnouts which pre-dates that should probably be disregarded.

.box file attached.

cheers,

Martin.

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Attachment: 0_mf_k24_3p42_for_chris.box (Downloaded 45 times)
 
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6th message | this message only posted: 12 Jul 2019 11:30
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from:
Chris Hillier
 

 

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Hi Martin.
Thank you very much for your replies. I'm starting to see the light at the end of the tunnel now!
I have managed to recreate your first example myself, following your guidelines and this is works great for my particular site plan. I will work through you second example asap to understand that way of doing things as well. Once again, thank you for shoving me in the right direction.
Chris.
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