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                                       Interesting RAIB accident report
     
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1st message | this message only posted: 16 Feb 2016 17:39
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from:
Martin Wynne
West Of The Severn, United Kingdom



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Please do not send requests for help direct to me via email or PM.

Post your questions on the forum where everyone can see them and add helpful replies.
This recent RAIB accident report contains some interesting track details about 2-level baseplates:

 https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/490855/R012016_160111_Washwood_Heath.pdf

See paragraphs 56-57, and 101-122.

If even RAIB is now referring to a turnout as a "point", I fear we must declare the battle lost. :(

Martin.

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2nd message | this message only posted: 18 Feb 2016 02:27
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from:
Andrew Barrowman
USA

 

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Is good to know I'm not the only one that doesn't know where to put the chairs, although I suppose it's not so good to know if you travel on NR.

And plastic pivot bearings - they'll be printing plastic wheels next :)
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3rd message | this message only posted: 18 Feb 2016 04:39
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from:
Matt M.
Australia

 

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Hi Andrew,

Not plastic pivots but the sacrificial liner between
the pivot and bearing surface. It is simply to keep the steel sections apart.
This saves trying to oil or re-grease so often in a hard to get to spot.
Steel against steel is a horrible bearing surface and creates a lot of friction.
This is a standard item in bogie mountings. The composite used would
be selected for compression resistance and self lubrication.

These items have been made from a variety of materials in the past,
including asbestos.

There is a mileage life

Ship propeller shafts use resin impregnated paper bearings.

If you have a car with MacPherson struts you will see something
similar at the bottom of the coil, usually in the form of a
nylon based cover over the last part of the coil.
This keeps the the steel spring separated from the base,
(or bottom compression plate), to ease the turning of the front wheels.

When the cover wears out you will know as the spring will catch and
let go on the plate as you turn the steering wheel making a clunking
noise similar to the failure of your CV joints.

Regards, Matt M.
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4th message | this message only posted: 18 Feb 2016 05:52
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from:
Matt M.
Australia

 

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Hi Andrew,

My email displayed your message in such a way that I missed the
word "bearing" in your message.

My bad.

Regards, Matt M.

PS. I have been enjoying the 3D printing topic.
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5th message | this message only posted: 18 Feb 2016 05:55
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from:
Andrew Barrowman
USA

 

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This derailment happened not too far from here. (I've rafted down that stretch of the river.)

Boeing "float planes"

Possibly a "track geometry" problem, but I can't find the official report. I imagine a lot of lawyers are involved.

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6th message | this message only posted: 18 Feb 2016 06:09
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from:
Andrew Barrowman
USA

 

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Matt M. wrote: Hi Andrew,

My email displayed your message in such a way that I missed the
word "bearing" in your message.

My bad.

Regards, Matt M.

PS. I have been enjoying the 3D printing topic.
Hi Matt,

You probably realized I was just joking around :)

I was taking a shot at myself with the "wheels" comment - I have actually printed sample plastic locomotive drivers.

Glad you are enjoying the turnout printing story, although "saga" might be more appropriate.

Cheers!
Andy

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