Search found 609 matches

by Martin Wynne
Mon Jun 10, 2019 10:55 am
Forum: Railmotors, Railcars and Multiple Units
Topic: Why the big windows?
Replies: 23
Views: 2458

Re: Why the big windows?

Is there anything in the story that the full depth windows caused photo-hypnotic effects in the driver from the sleepers flashing closely below? So far as I know, there were no visible measures taken at the time to reduce any such risk, so presumably not. A driver's attention whilst the train is mo...
by Martin Wynne
Sun Jun 09, 2019 8:46 pm
Forum: Railmotors, Railcars and Multiple Units
Topic: Why the big windows?
Replies: 23
Views: 2458

Re: Why the big windows?

Is there anything in the story that the full depth windows caused photo-hypnotic effects in the driver from the sleepers flashing closely below? But the driver needed to see a little old lady waving her handkerchief: https://www.independent.co.uk/travel/uk/stop-the-train-i-want-to-get-off-the-magic-...
by Martin Wynne
Sat Jun 08, 2019 7:52 pm
Forum: Track and Turnouts
Topic: Joggled Stockrails
Replies: 61
Views: 4102

Re: Joggled Stockrails

Hi Julian,

Templot will print the template with joggles if you tick the box on the switch settings dialog:

joggles1.png
joggles1.png (56.93 KiB) Viewed 925 times


joggles2.png
joggles2.png (53.95 KiB) Viewed 926 times

cheers,

Martin.
by Martin Wynne
Wed Jun 05, 2019 1:32 pm
Forum: Layouts and Operations
Topic: Onward from Ambergate
Replies: 99
Views: 27749

Re: Onward from Ambergate

TonyMont wrote:I suppose I could lift a template off the Templot club site. I will have a go.

Hi Tony,

There is a downloadable Templot file for a scissors crossover at:

http://85a.co.uk/forum/view_topic.php?i ... forum_id=1

(It's EM and curved, but will serve the purpose.)

cheers,

Martin.
by Martin Wynne
Thu May 30, 2019 10:50 am
Forum: Track and Turnouts
Topic: Joggled Stockrails
Replies: 61
Views: 4102

Re: Joggled Stockrails

Martin your sketch is showing an undercut switch with the top of the tip at the gauging line 18/32" below rail top level with an effective width of zero. Hi Julian, My sketch was intended to show that IF the tip is reduced to zero width at the gauging depth, then the gauge is unaffected and no...
by Martin Wynne
Wed May 29, 2019 7:29 pm
Forum: Track and Turnouts
Topic: Joggled Stockrails
Replies: 61
Views: 4102

Re: Joggled Stockrails/undercut blade considerations

Was Martin talking about Straightcut switches? I thought he was trying to dissuade me from them and joggles. ... Hi Julian, I've lost track of what you were asking me. http://85a.co.uk/forum/images/emoticons/confused.gif The 9/16" gauging line below the rail top applies to all track, not only ...
by Martin Wynne
Mon May 27, 2019 4:37 pm
Forum: Track and Turnouts
Topic: Joggled Stockrails
Replies: 61
Views: 4102

Re: Joggled Stockrails

That looks similar/identical? to the diagram further down on your link earlier Martin from a contributor Richard R. Hi Julian, They are actually from David Rayner: http://85a.co.uk/forum/view_topic.php?id=2802&forum_id=6#p19573 David runs "Off The Rails" for 3-D printed chairs, etc: h...
by Martin Wynne
Mon May 27, 2019 10:39 am
Forum: Track and Turnouts
Topic: Joggled Stockrails
Replies: 61
Views: 4102

Re: Joggled Stockrails

Dave (Bradwell) there are two gradients on the blade tip of your elevation drawing. How far below rail level is the tip of the blade on your drawing, how far is it till it is at full height and how far along does the first gradient end? Hi Julian, Here are some better quality scans. Bear in mind th...
by Martin Wynne
Fri May 24, 2019 12:03 pm
Forum: Track and Turnouts
Topic: Joggled Stockrails
Replies: 61
Views: 4102

Re: Joggled Stockrails/undercut blade considerations

Just to make the point that if we have gauge narrowing of say 0.1mm at the tip (because the thickness of a B switch blade can't be as little as 0.33 Hi Julian, There is no gauge narrowing (measured at the gauging line, 9/16" below the rail top). It is perfectly possible for the tip thickness t...
by Martin Wynne
Thu May 23, 2019 9:33 pm
Forum: Layouts and Operations
Topic: South Pelaw Junction
Replies: 65
Views: 13262

Re: South Pelaw Junction

John Donnelly wrote:Templot plan is down with a couple of trains for effect

+1
by Martin Wynne
Thu May 23, 2019 12:06 pm
Forum: Track and Turnouts
Topic: Joggled Stockrails
Replies: 61
Views: 4102

Re: Joggled Stockrails

The tip of the blade should be low enough that the wheel does not make contact with the top or inner face of it until it has passed some way beyond the toe of the switch blade. It then continues to rise to progressively take the full load of the wheel tread. Joggled switch blades take the full load...
by Martin Wynne
Wed May 22, 2019 1:03 pm
Forum: Track and Turnouts
Topic: Joggled Stockrails
Replies: 61
Views: 4102

Re: Joggled Stockrails

Obviously in the model, to function as intended the height of the blade will need to be controlled, while the real thing is heavy enough not to stand proud of the slideplates. I soldered arms to the stretcher bars to go under the stockrails so the blades cannot rise Hi Julian, An essential function...
by Martin Wynne
Wed May 22, 2019 2:19 am
Forum: Track and Turnouts
Topic: Joggled Stockrails
Replies: 61
Views: 4102

Re: Joggled Stockrails

Hi Dave, Well I have this drawing of how to represent an undercut switch tip in simplified model form (assuming vertical rail): http://85a.co.uk/forum/gallery/2/original/2_212140_560000000.png Julian you asked if I have any suggestions for joggles, and the answer is yes -- don't use them . http://85...
by Martin Wynne
Sun May 19, 2019 1:58 pm
Forum: Track and Turnouts
Topic: Joggled Stockrails
Replies: 61
Views: 4102

Re: Joggled Stockrails

If using a ruler the length between A and C will not abut the ruler. Hi Julian, Your drawing is correct. It is actually very tricky to get right in a model, especially the very slight bend needed at C. Phil wrote: If you're building GW turnouts, the timbering is square to the centreline, what Marti...
by Martin Wynne
Wed May 08, 2019 4:10 pm
Forum: Track and Turnouts
Topic: Turnout construction - Question here please.
Replies: 115
Views: 16906

Re: Turnout construction - Question here please.

Hi Julian, In Templot you can: switch joggles on or off for any template; create a custom switch having any joggle dimensions of your choosing, or use one of the pre-set GWR switches based on prototype dimensions; select "overscale joggle depth" in the generator, which over-rides any other...
by Martin Wynne
Mon May 06, 2019 12:10 pm
Forum: Track and Turnouts
Topic: Turnout construction - Question here please.
Replies: 115
Views: 16906

Re: Turnout construction - Question here please.

p.s. to clarify that diagram -- or make it more confusing -- I have added some rail outlines:

straightcut_blade_tip_outlines.png
straightcut_blade_tip_outlines.png (16.26 KiB) Viewed 1146 times

This shows how the blade tip fits into the joggle to align the running edge with the unjoggled part of the rail.

Martin.
by Martin Wynne
Mon May 06, 2019 8:30 am
Forum: Track and Turnouts
Topic: Turnout construction - Question here please.
Replies: 115
Views: 16906

Re: Turnout construction - Question here please.

I have to make a pair of joggled B switches with full height blades as in the straightcut blades pictures earlier on this thread. I can file the blades to a minimum sensible thickness of about 0.2mm. 3/8" blades scale out at 0.125mm. Hi Julian, You should be able to file them thinner than that...
by Martin Wynne
Wed Apr 24, 2019 4:25 pm
Forum: Product Information
Topic: Exactoscale Products
Replies: 76
Views: 18161

Re: Exactoscale Products

The point kits no longer seem to be listed on the Exactoscale site which is disappointing as I was hoping the full range would become available again. I agree that the pricing under the last vendor was off-putting to say the least, but I do hope they re-appear (at a reasonable price for everyone). ...
by Martin Wynne
Sun Apr 21, 2019 9:05 pm
Forum: Track and Turnouts
Topic: rail/wheel profile - prototype has problems too
Replies: 22
Views: 1798

Re: rail/wheel profile - prototype has problems too

Hi Julian, I'm wondering if pin-point axles play any part in this. Is there any empirical evidence on the relative derailability of wagons with pin-point versus parallel needle bearings? Note that the prototype doesn't use pin-point bearings. Nor traditional tinplate train sets. If there is any end-...
by Martin Wynne
Fri Apr 19, 2019 8:51 am
Forum: Track and Turnouts
Topic: Turnout construction - Question here please.
Replies: 115
Views: 16906

Re: Turnout construction - Question here please.

After laying out the sleepers on the Templot which had double sided tape on it I marked the points where the rivet needed to go. The pen I used, the ink bleed into the wood rather than leaving a a dot, so next time get a different pen. Went to use the hole punch and the pin didn't penetrate the sle...
by Martin Wynne
Thu Apr 18, 2019 11:39 am
Forum: Track and Turnouts
Topic: rail/wheel profile - prototype has problems too
Replies: 22
Views: 1798

rail/wheel profile - prototype has problems too

The RAIB has published an accident report today which contains interesting information about the P1 wheel profile:

https://www.gov.uk/government/publicati ... ember-2018

Martin.
by Martin Wynne
Wed Apr 17, 2019 10:10 pm
Forum: Track and Turnouts
Topic: Crossing Vee Jig
Replies: 26
Views: 3296

Re: Crossing Vee Jig

Martin's magic engine tells me that I have Vees to build soon in BH rail to these specs 1:x where x = 4.53, 5.08, 5.5, 5.58, 5.6, 5.7, 6.16, 6.25, 6.38 as well as the common values, 5, 5.5, 6, 6.5, 7 etc I have recently acquired a copy of "GWR Switch and Crossing Practice", which I have r...
by Martin Wynne
Mon Mar 18, 2019 1:17 pm
Forum: Operating in Practice
Topic: Operational entertainment...
Replies: 34
Views: 6500

Re: Operational entertainment...

Tim V wrote:I think you have to consider if you are representing what happened on one day, on say 12 September 1932

That would make an interesting model. It poured with rain all day.

:)

Martin.
by Martin Wynne
Wed Feb 27, 2019 5:31 am
Forum: Track and Turnouts
Topic: Modelling loose heeled switches in 4mm
Replies: 34
Views: 3108

Re: Modelling loose heeled switches in 4mm

seanmcs wrote:I'd like to explore the GWR turnouts on Templot. Possibly would save me making up my own templates, as the printed ones are unsuitable. Can I look at it with a Mac?

Hi Sean,

Yes, there are 3 ways to run Templot on a Mac. Full details at:

http://templot.com/companion/for_you.php

cheers,

Martin.
by Martin Wynne
Wed Feb 27, 2019 5:09 am
Forum: Track and Turnouts
Topic: Modelling loose heeled switches in 4mm
Replies: 34
Views: 3108

Re: Modelling loose heeled switches in 4mm

"It is not widely appreciated that semi-curved switches came into use on the Great Western only in the 1930s and were used only for new construction. The older curved loose heeled switches remained in use into BR times." Hi Sean, The GWR did not use semi-curved switches. The flexible swit...

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