Coldfair Green crossing

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nigelcliffe
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Joined: Mon Jul 21, 2008 8:31 am

Coldfair Green crossing

Postby nigelcliffe » Sat May 03, 2014 6:31 pm

IMG_0221[1].JPG
Coldfair Green level crossing


A slightly grainy view of the level crossing taken at the workshop on 2nd May. Work was underway along the line, adding to the crossing keeper's garden, hence plastic container on track.


Video of the level crossing taken some time ago, before the crossing keeper's cottage had been built and installed:




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Andy W
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Joined: Thu May 21, 2009 8:11 am

Re: Coldfair Green crossing

Postby Andy W » Sat May 03, 2014 7:07 pm

Brilliant! Love the mechanism!
Make Worcestershire great again.
Build a wall along the Herefordshire border and make them pay for it.

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TonyMont
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Re: Coldfair Green crossing

Postby TonyMont » Sat May 03, 2014 8:35 pm

Hi.
The movement is brilliant, very ghostly without a gatekeeper.
Tony.

Terry Bendall
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Re: Coldfair Green crossing

Postby Terry Bendall » Sun May 04, 2014 8:01 am

Very nice Nigel and well engineered.

Terry Bendall

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Mark Tatlow
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Re: Coldfair Green crossing

Postby Mark Tatlow » Tue May 06, 2014 2:15 pm

I do like that Nigel; I wonder if I can find an excuse for a crossing at some point.......
Mark Tatlow

nigelcliffe
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Re: Coldfair Green crossing

Postby nigelcliffe » Tue May 06, 2014 3:22 pm

The crossing mechanism is one of John Watson's. He's made at least four over many years; most layouts seem to need a crossing once you've got a really good mechanism ! The electronics around it is my work, though only necessary for interlocking to signals and track power supply.

hughesp87
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Re: Coldfair Green crossing

Postby hughesp87 » Tue May 06, 2014 7:09 pm

Nigel,

Am I right in saying that the motor used in this case is from a video camera? I have a few of these and am currently designing a mechanism using them to operate turnout indicators on my p87 layout 'Obbekaer'. Mine seem to work best on around 3 volts, so will need a separate control board to achieve the optimum speed.

What supply have you used for the level crossing?

Regards,

Geraint Hughes
Geraint Hughes
Cromford & High Peak in P4
Danish Railways in P87

nigelcliffe
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Re: Coldfair Green crossing

Postby nigelcliffe » Tue May 06, 2014 9:00 pm

Geraint,

The motor used is from the "scrap box" of useful bits, so original source unknown. It runs at a fair bit more than 3v, I'm reasonably sure it is driven by the 12v DC from a commercial switched-mode DC power supply which also operates the crossing control relays, plus the uncoupler magnets and the servo control boards (for turnouts and signals) on the adjacent baseboard. The speed reduction was achieved with various gears and gearboxes from the scrap box; selected to get the mechanism to run at "about the right speed". The mechanism was installed a lot more than a year ago, so not 100% certain on the operating voltage of the motor, and the layout isn't stored at my house to check it.

If you need 3v, then I'd expect that a really simple two-transistor DC speed control circuit should be sufficient to control your motor.

- Nigel

hughesp87
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Joined: Tue Aug 05, 2008 8:25 pm

Re: Coldfair Green crossing

Postby hughesp87 » Wed May 07, 2014 7:00 pm

Thanks Nigel, that was my thinking as well.

Geraint
Geraint Hughes
Cromford & High Peak in P4
Danish Railways in P87


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