First turnout, 4 chairs i'm clueless about

Discuss the prototype and how to model it.
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grovenor-2685
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Re: First turnout, 4 chairs i'm clueless about

Postby grovenor-2685 » Sat Aug 15, 2015 11:59 am

If you are using the Exactoscale functional chairs all of the needed info is available on the C&L website in their knowledge centre.
ie. http://www.finescale.org.uk/index.php?route=information/information&information_id=36
particularly the section on special switch chairs toward the bottom of the page.
eg http://www.finescale.org.uk/pdfs/RH%20Switches.pdf
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Keith
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Martin Wynne
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Re: First turnout, 4 chairs i'm clueless about

Postby Martin Wynne » Sat Aug 15, 2015 12:05 pm

Hi Mike,

Those are block chairs. Available from C&L in the Exactoscale range: http://www.finescale.org.uk/index.php?r ... ct_id=3939

Martin.
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Paul Willis
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Re: First turnout, 4 chairs i'm clueless about

Postby Paul Willis » Sun Aug 16, 2015 8:15 am

MikeH wrote:Btw for a B7, I take it I use the triangular gauge for the main tracks, Checkrail gauge on the checkrails and flangeway guide for the small bits where the flange has to fit through?


That's the general principle, yes...

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grovenor-2685
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Re: First turnout, 4 chairs i'm clueless about

Postby grovenor-2685 » Sun Aug 16, 2015 8:46 am

MikeH wrote:Btw for a B7, I take it I use the triangular gauge for the main tracks, Checkrail gauge on the checkrails and flangeway guide for the small bits where the flange has to fit through?


The only bit where this does not quite work is the section where the switch planing fits against the stockrails, tight gauge here is a common beginners problem often from not recognising the importance of the set in the curved stockrail.
This may help http://www.norgrove.me.uk/points.html
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Martin Wynne
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Re: First turnout, 4 chairs i'm clueless about

Postby Martin Wynne » Sun Aug 16, 2015 10:51 am

Hi Mike,

That's looking good. But the final long timber with a bend in it should be straight. Despite appearances on every Peco turnout for the last 50 years, real timbers don't bend. Image

For more about setting the stock rail, you may be interested in this post on the Templot Club forum:

http://85a.co.uk/forum/view_postx.php?post_id=8209

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Martin.
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Re: First turnout, 4 chairs i'm clueless about

Postby Martin Wynne » Wed Aug 26, 2015 3:17 pm

Hi Mike,

1. Have you checked the back-to-back of the wheels?

2. How much switch drive (blade opening) have you allowed at the stretcher bar? It doesn't look enough in your photo. The prototype opening is 4.1/4" (scale 1.42mm, and it is worth making it a bit more for P4, say 1.5mm. That's more than double the flangeway gap of 0.67mm (a common misunderstanding). The open blade must open far enough to have a clear 2" (say 0.75mm for P4) all along behind it, so that wheels never contact it. If wheels do contact it, any movement can be transmitted through the stretcher bar to the opposite switch blade, possibly causing it to lose proper fit against the stock rail.

(If wheels contact an open switch blade on the prototype it can be disastrous, see the Grayrigg disaster: https://assets.digital.cabinet-office.g ... igg_v5.pdf )

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Martin.
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grovenor-2685
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Re: First turnout, 4 chairs i'm clueless about

Postby grovenor-2685 » Wed Aug 26, 2015 4:31 pm

Have you got something to measure the gauge with? It certainly looks to me that you have tight gauge between the curved switch and stockrail. Difficult to tell properly from your photos but I can't see the set in your stock rail and it certainly looks to be curved over the first 4 slide chairs where it should be straight at the planing angle.
Have a look at the relevant section of http://www.norgrove.me.uk/points.html
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Re: First turnout, 4 chairs i'm clueless about

Postby grovenor-2685 » Wed Aug 26, 2015 6:54 pm

You can see in the pics that the wheel is climbing over the switch rail, that is a pretty sure sign of tight gauge.
A 3 point gauge does not help much to measure it as it won't fit in the critical area when the switches are in place.
A caliper is really needed but a single wheelset will give you a good idea, you should be able to get the same amount of sideplay all the way through the switches as you get on plain track, any tight spots will initiate flange climbing and need to be adjusted out.
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Re: First turnout, 4 chairs i'm clueless about

Postby grovenor-2685 » Fri Aug 28, 2015 2:27 pm

Good to hear.
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