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... it is not going to work for the moving switch blades. cheers, Martin. posted: 27 Oct 2017 17:32 from: Andrew Barrowman Good morning Martin, Thanks for the information regarding tilt. It should be possible to include that in the designs but I'll probably defer that for a bit. It might be possible to roll-form 8 thou nickel silver strip into a channel for the cap but I have not been able to find a source for the material yet. I'm going to experiment with brass and phosphor bronze first. I have some CRS too, but it is tin plated. Yes, the switch rails will likely have to be solid metal. This isn't a new idea. You can buy G track in the US which is nearly all plastic except for the rail head. It looks really horrible too, but it would probably look a lot better if it was painted. Regards, ab posted: 27 Oct 2017 17:38 from: Andrew Barrowman PS Do wheels in the US have a corresponding cone angle? And ...
... of holding the point blades against the stock rail? In fact looking at your servo installation: 2787_201839_300000000.jpg it's not clear to me how it drives the points over? Is the top plate acting as a fulcrum for the drive rod? Whatever, all you need to operate a relay is to arrange something to make contact against something else as an improvised on-off switch. This is 100 times easier to do than improvising a changeover switch. For example an ordinary choc-block connector could have a bit of springy phos-bronze wire sticking out of it, which makes contact with the drive rod to the points in one position, and not the other. Connect the drive rod/bracket/whatever to the system ground (common return), and the springy bit of wire through the relay coil to the power supply. To be really posh you could add a reverse diode across the relay coil to quench any inductive sparking and keep the springy wire nice and clean, although even without I suspect it would work fine for 50 years without needing ...
... order?). The two rail code dimensions where the sizes are preceded by the word *approximately* (i.e. Code 75 N.S. F/B& Code 70 N.S. F/B) are shown as such since they were quoted to me as being "about the same" as Code 82 Flat Bottom Rail. SMP RAIL (see note below) Code 75 Nickel Silver Bullhead Rail 0.83mm (0.0326") [Old measured sample]. 0.815mm (0.032") [New measured sample] Code 75 Phosphor Bronze Bullhead Rail SMP report this is the same size as the Nickel Silver rail (above) [* I suspect this has not been confirmed accurately*] Code 75 Nickel Silver Flat Bottom Rail 0.905mm (0.0356") [New measured sample] Code 100 Nickel Silver Flat Bottom Rail 1.025mm (0.040") [New measured sample] MARCWAY RAIL Code 100FB Nickel Silver Flat Bottom Rail 1.025mm (0.040") [New measured sample] Code 90 FB Nickel Silver Flat Bottom Rail Marcway were out of stock of this rail, ...
... 09:08 from: Jim Guthrie Correction. I've just looked at the Mick Nicholson picture again and seen the opposite slip rail is bolted to the slide chair. Jim. posted: 6 Apr 2012 10:50 from: Phil O Jim Guthrie wrote I won't actually be building this track (it's for someone else) but I think I might have to think of some way of hingeing the short "K" switch blades. I'm more used to laying longer flexible switch blades. Jim. Hi Jim I use 1mm Phosphor Bronze strip to make the hinge on GW old style switches, I put it on the viewing side so that it looks like the two bolt fishplate the GW used. It sometime needs to be narrowed a bit to fit the rail web. If a heel chair is needed remove the portion of key which sticks out from the chair and then open up the resultant jaws so that the rail is a loose fit. HTH Phil Edit: Just noticed this for S7 where as I model in 4mm so a wider bit of strip ...
... type heel (curved switches)available in templot switches, are loose heel they are secured to the closure rail by a 2 bolt fishplate and the heel end of the switch sits in a double chair the stock rail is keyed but the switch rail is not, hence loose. See photo 2 in Share and show, GW special chairs, Switch chairs. Photo 1 is the last chair on the closure rail, all other chairs are slide chairs see photo 3. The fish plate can be modelled using a piece of phoshur bronze stip (use on one side of the rail only)it is flexible and durable enough to with stand the ravages of operation. I hope this is of help. Cheers Phil Last edited on posted: 5 Dec 2007 02:30 by Phil O 5 Dec 2007 02:30 from: Terry Beddoes Terry Beddoes wrote: rodney_hills wrote: Terry, I can't comment on the point details in the photo, but that Down (Home?) signal intrigues me. The main arm seems to be 'off' but the ...
... Bob Ellis Martin Wynne wrote: The latest "hi-nickel" alloy from C&L doesn't have the yellow tinge of traditional nickel-silver rail, and to a blind man on a galloping horse, it does look a bit like the real thing. Oy! Who are you calling a blind man on a galloping horse? Best wishes, Bob Ellis posted: 23 Jan 2008 01:43 from: Phil O Hi All I have just got home from work and wish to say that I have been using phosphur bronze rail for years. It stays relativly clean for a considerable time even on the exhibition circuit where I was for ever cleaning nickel silver rail, the down side the head of the rail looks a little rusty even after cleaning but on the plus side the rest of the rail looks rusty all the time just like the prototype without spending hours painting it. It also solders a dream. Cheers Phil posted: 23 Jan 2008 22:12 from: Roderic Cameron Brian (Lewis) Following on from Paul Boyd's question, is ...
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... for isolation purposes, that will disappear as the temperature rises and in a worse case scenario could lead to buckling as occasionally happens on the real thing. On the other hand if you lay the track with a high ambient temperature, that same gap will increase and lead to possible poor running and possible derailments. Different types of rail have different coefficients, so expand at different rates. I would recommend that you use the same type of rail throughout, ie. All nickel silver, all steel, all stainless or even phosphor bronze, that way it will all move at the same rate. If I get a chance later, I will have a look at a couple of expansion rates. Phil. posted: 6 Nov 2020 13:54 from: Ian McKee Thanks for that Phil. posted: 6 Nov 2020 14:58 from: Phil O Ok,I have found an online calculator, saves me ageing brain cell from having to do the maths. All are for a 1 metre length and a 10C temperature increase. Nickel silver about ...
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