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Author Topic: Building a Semaphore Junction Signal  (Read 264 times)

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Offline LowerQuadrant

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Building a Semaphore Junction Signal
« on: March 10, 2019, 02:41:00 PM »
 :hellosign:

First, I would like to introduce myself: I'm Christoph from Germany. I'm very much into british N Gauge which isn't exactly common in these parts. A visit to England in spring 2017 gave me the idea of building a (very) small English layout.
I'm using Dapol semaphore signals but there seems to be no working junction signal you can buy off the shelf.

So I built one myself and it didn't turn out too bad. Let me know what you think of it.



I built a simple Mast from a 3x40 mm brass rivet and a 21x7 mm piece of copper plated Pertinax/hard paper for the traverse. I drilled a 3 mm hole for the mast and two 1.5 mm holes for the signals. Two small cuts for the push/pull rods are also required. Another piece of Pertinax is needed for the mounting plate which needs two 1 mm holes for the push/pull rods to go through and at least one screwhole. Before soldering the parts together, I made a 3 mm deep cut into the head of the rivet (for the led wires). This simple construction is very stable. The mast was painted with aluminum colour.


This is all that's left from the Dapol signals...

The next job was quite painful :'(: dismantling two perfectly good Dapol GWR round post signals and throwing away most of it, isn't nice but well worth the effort. I cut the masts to the appropriate lengths (not damaging the led wires!) and glued them into the 1,5 mm holes using a drop of superglue. I pulled the wires through the cut in the mast using a piece of wire with a hook.

The lattice on the traverse is made from cardboard stripes and has absolutely no influence on the stability.

Finally, I bent the original rods into shape and attached some extensions with superglue as Dapol uses some material that can't be soldered, obviously. I painted the rods black for better appearance.

This is about it. The junction signal is driven by two 9g servos and works like a charm. The next step will be the maintenance platform.

Who knows where the real thing stands? ;D

Cheers
Christoph
« Last Edit: March 11, 2019, 12:04:17 PM by LowerQuadrant »

Offline Newportnobby

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Re: Building a Junction Signal
« Reply #1 on: March 10, 2019, 06:53:48 PM »
Hi Cristoph, and welcome to the forum :wave:
Your signal looks very, very good.

Here's another from Germany modelling UK stuff.........

https://www.ngaugeforum.co.uk/SMFN/index.php?topic=41548.msg544706#msg544706

Online Bealman

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Re: Building a Junction Signal
« Reply #2 on: March 10, 2019, 07:12:47 PM »
G'day from Australia, Cristoph, and welcome to the NGF!  :thumbsup:

Your signal certainly has me impressed, as does the one in the background! :thumbsup:

The ground signal is great, too!

Looking forward to hearing more about this layout!  :beers:
Vision over visibility. Bono, U2.

Offline port perran

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Re: Building a Junction Signal
« Reply #3 on: March 10, 2019, 07:17:31 PM »
Hi Christoph.
That is certainly very impressive sstuff with amazing attention to detail.
And welcome to the forum by the way.
If it looks right then it most probably is right.


Offline LowerQuadrant

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Re: Building a Junction Signal
« Reply #4 on: March 10, 2019, 08:19:05 PM »
Thx a lot! ;D


Your signal certainly has me impressed, as does the one in the background! :thumbsup:

The ground signal is great, too!

Looking forward to hearing more about this layout!  :beers:

I'll start a thread on my layout "Rose-an-Grouse" soon  :)


The signal in the background is an original Dapol signal ;) The ground signal is made from a piece of 1mm brass tube, a red micro-led and some cardboard. Just a dummy - but it's lit though. The lamp is tiny and a bit hard to see. Maybe it's a litte more apparent in this picture:



Best regards
Christoph
« Last Edit: March 10, 2019, 10:15:19 PM by LowerQuadrant »

Online Bealman

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Re: Building a Junction Signal
« Reply #5 on: March 10, 2019, 09:49:27 PM »
Wow, the ground signal is lit too! Awesome!

The LED shows up fine in the photo.

Looking forward to the thread very much. Love the name of it too!  :thumbsup:
Vision over visibility. Bono, U2.

Offline BR Signalman

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Re: Building a Semaphore Junction Signal
« Reply #6 on: March 16, 2019, 04:03:43 PM »
Stunning!! Somebody who actually knows what signals should look like and knows how they should be placed.

Offline LowerQuadrant

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Re: Building a Semaphore Junction Signal
« Reply #7 on: March 19, 2019, 12:00:07 PM »
Stunning!! Somebody who actually knows what signals should look like and knows how they should be placed.


Thanks for the praise :D But I just dimmed them down - quite a bit. Afaik Dapol recommends operation at 14V AC. But with this kind of voltage I could easily illuminate the whole layout with my total of six signals :scowl: Same goes for buffer stop lights or any kind of lamps. I solved the problem by using a separate transformer for lighting (which is the proper thing to do anyway) with an output of just about 3,5 Volts AC. Special transformers for Christmas cribs turned out to be quite ideal in combination with 1 kOhms resistors and make a very nice and athmospheric light.

However, I don't know what the required minimum voltage for the signal motors is as I replaced them with servos.

« Last Edit: March 19, 2019, 12:13:44 PM by LowerQuadrant »

Offline crewearpley40

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Re: Building a Semaphore Junction Signal
« Reply #8 on: March 19, 2019, 06:51:50 PM »
very realistic and thought out on the signal positioning
blue / grey era diesels / electrics and suitable stock

Online lil chris

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Re: Building a Semaphore Junction Signal
« Reply #9 on: March 19, 2019, 10:54:27 PM »
Nice looking signals there Christoph, and welcome to the forum. I look forward to seeing how you progress with the layout, wish I had your ability to build signals. lil chris (christopher).
Lil Chris
My layout here East Lancashire Lines
http://www.ngaugeforum.co.uk/SMFN/index.php?topic=29492.0

 

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