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topic: 2518From the memory banks
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posted: 22 Aug 2014 12:54

from:

Martin Wynne
 
West Of The Severn - United Kingdom

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A topic on RMweb has just reminded me of something I tried a long time ago. Nowadays the availability of moulded chairs may make it worth considering for beginners. You can build initially with the cheapness and adjustability of copper-clad, and then only later fit cosmetic half-chairs if desired. For this to be possible the rails need to be lifted above the surface of the timber (strictly by a scale 1.75", the thickness of the base of a chair casting, or 0.58mm in 4mm/ft scale -- but anything is better than nothing).

From an old topic on RMweb:

95_crossover02_1.jpg95_crossover02_1.jpg

In another world a long time ago I once did something very similar using single-sided Vero pins.

It was much quicker to do than the above looks to be. Use a softish workboard material under the template. Drill a 1mm hole with mini-drill, through the copper-clad and into the board, abrade off any copper burrs, and push in the pin. They have ribs under the head and are a firm push fit. There is no need to solder them separately -- you can do it all in one go when you are soldering the rail. Prise up the finished the turnout from the workboard and trim off flush the protruding pins from the underside. You could leave a few for invisible electrical connections. Make sure when laying that nothing can short the underside of the pins (as you would with Brook-Smith rivets).

Don't forget to gap the copper-clad. :)

We are talking 40 years ago, and much to my surprise the Vero pins are still available, and not desperately expensive:

  http://uk.rs-online.com/web/p/terminal-posts/6319596/

Here's the manufacturer's drawing:

  http://docs-europe.electrocomponents.com/webdocs/0e57/0900766b80e578ba.pdf

Templot can produce a drilling template showing rail centre-lines over timber centre-lines: main > enable generator menu, and then generator > generator settings > rails > rail head centre-lines only. Rebuild the background if necessary.

Print on school tracing paper* and lay over the copper-clad timbers as a drilling guide:

2_220711_090000000.png2_220711_090000000.png

*don't forget to do a printer calibration for this paper.

The current topic on RMweb is at:

 http://www.rmweb.co.uk/community/index.php?/topic/88849-horrabridge/page-5#entry1560435

Old topic on RMweb:

 http://www.rmweb.co.uk/forum/viewtopic.php?f=89&t=81&start=125

regards,

Martin.

posted: 22 Aug 2014 13:17

from:

Hayfield
 
United Kingdom

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This is also a very useful method for those who want chaired track, but prefer to build the crossings in situ.

Just remember to keep the chairs at the other end of the rail till the soldering is completed

 

John
Last edited on 22 Aug 2014 13:18 by Hayfield


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