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 turnout radius
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Author Previous Topic: Time for a new NCNG Topic Next Topic: shelf layout composition  

southpier
Engine Wiper

Posted - 03/16/2017 :  06:19:45 AM  Show Profile  Reply with Quote
is there a standard radius assigned to a #4 or #6 turnout curved rail?

thanks

Country: | Posts: 216

robchant
Crew Chief

Posted - 03/16/2017 :  08:52:22 AM  Show Profile  Reply with Quote
Hi,

Rail closure radius for NMRA standard turnouts are (about) as follows: #4 is 15"; #5 is 26"; #6 is 43"; #7 is 49"; #8 is 67"; and #10 is 117". However, since the diverging track is straight after the frog, this is not a replacement radius. So, it is just not a simple matter of dropping a curve of this radius in place instead of a turnout.

Take care,
Rob.



Edited by - robchant on 03/16/2017 08:55:15 AM

Country: Canada | Posts: 790 Go to Top of Page

railmus
Fireman



Posted - 03/16/2017 :  11:48:17 AM  Show Profile  Visit railmus's Homepage  Reply with Quote
I think turnouts from different manufacturers are not exactly the same radii.

Also, check out Tim Warris Fast Tracks templates on his site. http://www.handlaidtrack.com/track-templates



Country: Canada | Posts: 1931 Go to Top of Page

rca2
Engine Wiper

Posted - 03/16/2017 :  12:18:31 PM  Show Profile  Reply with Quote
Because they are so popular, I will mention that Atlas No. 4 turnouts (like the Mk IVs) are not standard sized. They are about 4.5.

Modeling Arizona Eastern Railroad, Hayden Junction (1920), in On30

Country: USA | Posts: 414 Go to Top of Page

southpier
Engine Wiper

Posted - 03/16/2017 :  12:38:34 PM  Show Profile  Reply with Quote
thanks for the input. since i'm still at the "paper & pencil" with plenty or erasers stage, i can use the information to get me further along and fine tune things as i go.


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robchant
Crew Chief

Posted - 03/16/2017 :  12:42:59 PM  Show Profile  Reply with Quote
Hi,

If you need any help with the design, or want to see it mocked up using CAD, just let me know.

Take care,
Rob.




Country: Canada | Posts: 790 Go to Top of Page

BurleyJim
Fireman

Premium Member


Posted - 03/16/2017 :  2:26:57 PM  Show Profile  Reply with Quote
quote:
Originally posted by robchant

Hi,

Rail closure radius for NMRA standard turnouts are (about) as follows: #4 is 15"; #5 is 26"; #6 is 43"; #7 is 49"; #8 is 67"; and #10 is 117". However, since the diverging track is straight after the frog, this is not a replacement radius. So, it is just not a simple matter of dropping a curve of this radius in place instead of a turnout.

Take care,
Rob.



Assuming "HO" as the scale.



Country: USA | Posts: 2324 Go to Top of Page

southpier
Engine Wiper

Posted - 03/16/2017 :  6:25:52 PM  Show Profile  Reply with Quote
Rob, thank you for the generous offer. i'll need to get the (very simple) design a bit more refined but i may just take you up on it.

Burley Jim & railmus: i took a look at the Fast Tracks templates and have some questions. if i'm using On30 motive power & rolling stock (along with some scratch built using Kaydee archbar trucks in straight HO scale) with everything built to 1/35 freelance "non-standards", does it matter if i use the HO or the On30 templates? i understand the teis are a bit different, but the rails are the same aren't they?



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BurleyJim
Fireman

Premium Member


Posted - 03/17/2017 :  9:41:48 PM  Show Profile  Reply with Quote
Mr. Pier,

That's my understanding.

Jim



Country: USA | Posts: 2324 Go to Top of Page

southpier
Engine Wiper

Posted - 03/18/2017 :  06:07:07 AM  Show Profile  Reply with Quote
"Mr. Pier" was my father; i'm a little South!


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