Templot Club Archive 2007-2020                             

topic: 3770Movable K-crossings / switch-diamond for a 1:10 double slip?
author remove search highlighting
 
posted: 15 Sep 2020 15:31

from:

William Williamson
 
 

click the date to link to this post
click member name to view archived images
view images in gallery view images as slides
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:

http://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: topic 2408  - 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?
Last edited on 15 Sep 2020 15:48 by William Williamson
posted: 15 Sep 2020 16:03

from:

Martin Wynne
 
West Of The Severn - United Kingdom

click the date to link to this post
click member name to view archived images
view images in gallery view images as slides
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:

http://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: topic 2408  - 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:

2_120732_280000000.png2_120732_280000000.png


Drawing of a bullhead 1:12 switch-diamond:

2_081530_450000000.png2_081530_450000000.png


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:

fb_movablek_dslip.jpgfb_movablek_dslip.jpg
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.

posted: 16 Sep 2020 18:22

from:

Phil O
 
Plymouth - United Kingdom

click the date to link to this post
click member name to view archived images
view images in gallery view images as slides
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.

posted: 21 Sep 2020 12:55

from:

William Williamson
 
 

click the date to link to this post
click member name to view archived images
view images in gallery view images as slides
Interesting, and only four slide chairs for the switch rail at the diamond?

posted: 21 Sep 2020 13:53

from:

William Williamson
 
 

click the date to link to this post
click member name to view archived images
view images in gallery view images as slides
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?

http://i.imgur.com/MW0AGDV.png

posted: 21 Sep 2020 17:47

from:

Tony W
 
North Notts. - United Kingdom

click the date to link to this post
click member name to view archived images
view images in gallery view images as slides
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.



Templot Club > Forums > Templot talk > Movable K-crossings / switch-diamond for a 1:10 double slip?
about Templot Club

Templot Companion - User Guide - A-Z Index Templot Explained for beginners Please click: important information for new members and first-time visitors.
indexing link for search engines

back to top of page


Please read this important note about copyright: Unless stated otherwise, all the files submitted to this web site are copyright and the property of the respective contributor. You are welcome to use them for your own personal non-commercial purposes, and in your messages on this web site. If you want to publish any of this material elsewhere or use it commercially, you must first obtain the owner's permission to do so.
The small print: All material submitted to this web site is the responsibility of the respective contributor. By submitting material to this web site you acknowledge that you accept full responsibility for the material submitted. The owner of this web site is not responsible for any content displayed here other than his own contributions. The owner of this web site may edit, modify or remove any content at any time without giving notice or reason. Problems with this web site? Contact webmaster@templot.com.   This web site uses cookies: click for information.  
© 2020  

Powered by UltraBB - © 2009 Data 1 Systems