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                 Movable K-crossings / switch-diamond for a 1:10 double slip?
     
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1st message | this message only posted: 15 Sep 2020 14:31
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from:
William Williamson
 

 

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When putting together a layout I've found a need for a 1:10 double slip. Thinking to myself, this'll be great - I ploughed forward. It was only when I printed the template out however, I noticed it didn't have any k-crossing wing rails. I rebuilt the slip outside of the layout and the same issue occured. Switching the size down to a 1:6 made them reappear:

https://i.imgur.com/Vaiwxg7.png

It looks like this is because Templot switches from fixed to movable K-crossings above 1:8 - which i guess is fine, but I've no idea how that might work.

I can see I can set them to be fixed here: https://85a.co.uk/forum/view_topic.php?id=2408&forum_id=12  - but how are they intended to work? Another set of tie bars? Is there a material concern with the lack of a switched diamond in a 1:10 double-slip?

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2nd message | this message only posted: 15 Sep 2020 15:03
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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.
William Williamson wrote: When putting together a layout I've found a need for a 1:10 double slip. Thinking to myself, this'll be great - I ploughed forward. It was only when I printed the template out however, I noticed it didn't have any k-crossing wing rails. I rebuilt the slip outside of the layout and the same issue occured. Switching the size down to a 1:6 made them reappear:

https://i.imgur.com/Vaiwxg7.png

It looks like this is because Templot switches from fixed to movable K-crossings above 1:8 - which i guess is fine, but I've no idea how that might work.

I can see I can set them to be fixed here: https://85a.co.uk/forum/view_topic.php?id=2408&forum_id=12  - but how are they intended to work? Another set of tie bars? Is there a material concern with the lack of a switched diamond in a 1:10 double-slip?
Hi William,

Slips and diamonds flatter than 1:8 should normally be switch-diamonds with movable K-crossings. The switch blades move across simultaneously in opposition. There is no break in the rail so no need for K-crossing check rails.

If you build a 1:10 diamond with fixed K-crossings, you will very likely get mis-tracking and derailments. That's why the prototype doesn't allow them. For wider than scale flangeways such as 00 and EM, derailments are almost certain.

Info from Templot Help notes:




Drawing of a bullhead 1:12 switch-diamond:




A modern switch-diamond double-slip. Quite common in flat-bottom, not so much in bullhead. Here's a close-up of the K-crossings:


pic thanks to Mick Nicholson

They are used when the crossing angle is flatter than 1:8.

They make a model slip much easier to build, because there is no need to find space for the K-crossing check rails. The downside being you need 2 extra point-motors and stretcher bars.

In a model diamond-crossing they also make the electrics much easier, because the V-crossing polarities can be controlled by the K-crossing switches. Just treat as in effect 2 turnouts toe-to-toe.

cheers,

Martin.

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3rd message | this message only posted: 16 Sep 2020 17:22
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from:
Phil O
Plymouth, United Kingdom



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On rod operated switched diamonds, one lever operates both switches via a rocking arm, which translates the pull or push into the opposite due to it having a centre pivot, I have seen it modeled, but can't remember when or where.

Cheers

Phil.
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4th message | this message only posted: 21 Sep 2020 11:55
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from:
William Williamson
 

 

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Interesting, and only four slide chairs for the switch rail at the diamond?
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5th message | this message only posted: 21 Sep 2020 12:53
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from:
William Williamson
 

 

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I have started to lay my track out, and realised that there are lots of adjacent turnouts I need to factor in. I'm hoping I can lift and shift this onto the layout proper in due course, and so I have added some rail cuts that I think will make the fitting of the slip into a larger arrangement more feasible. Any thoughts?

https://i.imgur.com/MW0AGDV.png
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6th message | this message only posted: 21 Sep 2020 16:47
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from:
Tony W
North Notts., United Kingdom

 

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William Williamson wrote: Interesting, and only four slide chairs for the switch rail at the diamond?Hi William.
There's a bit more to it than that. From the drawing there are four what we would regard as typical slide chairs, two labeled  SDP and two SD12, but there is also the special wide center chair SD12N plus 3 SDS chairs, which also allow the rail to move. The number 12 suffix relates to the chairs made specially to match that crossing angle. The details of each type of chair are shown in the diagrams below the main one. The actual number of chairs will vary with the crossing angle.
Regards
Tony.

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