Scalefour Forum

I can't believe it's 5 months since the live Templot session I did after the virtual Scaleforum show in September. Time to do another? The Gauge 0 Guild are doing a similar virtual show on March 6th , so I'm planning to do another live evening session to coincide with that. More about the Templot li...

+1

I have just come across this page: http://boltonsbits.com/7mm%20Etches.htm On which there is a lever frame intended for 7mm scale. It's described as a "cosmetic/non-working" model of a prototype BR frame, but it looks chunky enough possibly to be made to work in 4mm scale. MDF frames, etch...

+1

Unfortunately, none of the detail maps I have of the area go quite that far south and the NLS maps for London don't go quite that far north as yet, or didn't the last time I looked, so I can't say definitively one way or the other. Hi Tony, There are 50"/mile maps on old-maps.co.uk for 1966 an...

Hi Tony, I don't know if this is the right location, but the OS 10K map shows evidence of watercourses nearby: brimsdown_watercourse.png My purple rings. Watercourses are plotted from infra-red aerial photos, so only water visible above ground gets plotted. The local highway authority for the area w...

The 12th and 13th sleeper of the concrete based track are timber sleepers with what appears to be an expansion joint. This is curious as the subsequent track is still jointed and remained so for several years Hi Tony, Is there any culvert, drain, pipe, etc., under the track near this location? Some...

davebradwell wrote:You lost me there - what is EM-2?

https://85a.uk/00-sf/history.php

https://85a.uk/00-sf/

Martin.

If there was an easy way to give that vertical gap consistently, on a larger layout than my project I'd be tempted to represent the chair with a blob of solder. Hi Julian, On copper-clad it's easy -- 1mm drill in a Dremel mini-drill, push in a Vero pin. Lifts the rail the right amount, and on coppe...

It looks to me as though the rail is bent at the distance x according to the angle and then the railhead machined Hi Julian, Yes, all switch blades, point rails, vee nose rails, etc., are machined the same way like that. They are machined on both sides, so that there is still solid web metal at the...

Martin Wynne wrote:There is a drawing showing the machining of K-crossing point rails in the NERA reprint book. I will get it scanned later and post it

Scan now here:

https://85a.co.uk/forum/view_topic.php? ... 615#p31615

Martin.

The Exactoscale range of point kits was the nearest we have had so far, but sooner or later one is going to want something that isn't catered for and then its a matter of building from first principles whatever your chosen method. Wayne's new FinetraX kits look very promising. The bases are 3D prin...

Hi Julian, The knuckle bend radius in the K-crossing rails (and at the wing rail knuckle in V-crossings) serves the same purpose as the flared end on a check rail. So that a wheel back coming under control of the check rail does so progressively as it first makes contact. Likewise the front of a whe...

Have you seen that done Martin? I've not seen P-way men with other than a standard track gauge that only measures between running edges. Why would they use a different gauge when the one they have gives identical results? Hi Keith, Not with my own eyes, no. I will try to find the reference in the t...

You are correct in as much as 1:8 fixed obtuse crossings are the flattest that are allowed on the prototype, flatter angles being of the switched type only, but that is only a partial answer as the situations is complicated where curves are concerned as already discussed. Since S4 dimensions mirror...

Which is what the prototype does when fixing the check rail to the stockrail with standard spacer blocks Indeed, but when drilling and fixing the check rail chair to the timber, it is the check rail which is gauged from the opposite rail, not the stock rail. In effect what this means is that yes, i...

I would be a little more concerned about the SMP rail Hi Philip, Wayne has just posted that he will now be using EMGS rail in the EM kits, and has adjusted the CAD to fit: https://www.rmweb.co.uk/community/index.php?/topic/160234-new-range-of-simple-to-assemble-00em-gauge-pointwork-kits/&do=fin...

I would be a little more concerned about the SMP rail, but there were other rail sections mentioned in the earlier posts. Hi Philip, There you go immediately. If Wayne makes a track base for SMP rail, and you thread it with C&L rail, it will be over 0.1mm under gauge straight off. Before consid...

I would urge the committee to pursue the possibility of P4 versions of these products with vigour. Hi David, Wayne has already answered this, and said that he doesn't believe his manufacturing process can hold the required P4 tolerances. He also knows that if it doesn't, and something is 0.05mm out...

Tim V wrote:Don't let Martin Goodall read this thread!

Seriously, Martin would say push the wheels out to BtoB, and try them - you have nothing to lose

Markits flange thickness 0.7mm

P4 flangeway gap 0.68mm

er...

Point rails for obtuse crossings should never get that thin. 0.1mm or 4 thou is thin enough for me rather than the normal 0.25mm . Martin. Thanks for republishing this information. I have taken the liberty of copying the data into my track construction thread (with acknowledgements) so it is availa...

Is it possible to make a 1:7.5 obtuse crossing proof against the wheelset going the wrong way I wonder. Hi Julian, The problem with fixed K-crossings is with small wagon wheels, especially when being propelled (pushed), not loco wheels. Larger wheels have a longer length of flange below the rail to...

Digest sheet 23.6.3 available at https://www.scalefour.org/members/digests/#23 or for those who have it, on the CD given to you when you joined includes notes on building curved turnouts, including a Y turnout. (Halfway down page 4, LH column.) Hi Terry, As described, that creates an ordinary singl...

I have found this old scruff video clip, showing the basics of a symmetrical Y-turnout in Templot: https://flashbackconnect.com/Movie.aspx?id=FxKoMusLKl-B3vZws7U2yA2 But very often when folks are asking for a Y-turnout all they really need is an ordinary turnout with a bit of contraflexure. Just use...