4 track geometry

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graybc
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Joined: Fri Feb 08, 2013 7:37 pm

4 track geometry

Postby graybc » Tue Mar 25, 2014 7:32 pm

Hi all, I am looking at running 4 tracks around my baseboards but I am unsure of the radius of track to use. I don't want to use 1st radius.
I was thinking on the inside 2nd, then 3rd, then 4th but what after that for the 4th track ????
please bear in mind when replying that I am a novice to this hobby and need the replies in plain talk and easy to follow diagrams if possible...
Many thanks
Graham

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skyblue
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Re: 4 track geometry

Postby skyblue » Tue Mar 25, 2014 7:35 pm

I don't think that its possible to get anything larger than 4th radius curves, so you'll have to use flexible track. If you haven't heard of this it's basically normal track, except it can be shaped to a certain curvature. This can be achieved using a Peco Tracksetta (such as these here - other retailers are available) - this will ensure that the curves are nice and flowing and go where you want them to. You will have to match the radii given for each Tracksetta to the standard radii. Hope this helps.

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alex3410
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Re: 4 track geometry

Postby alex3410 » Tue Mar 25, 2014 7:37 pm

It will fit as long as you give the outer ring more length before you start the curve eg:

Image

graybc
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Re: 4 track geometry

Postby graybc » Tue Mar 25, 2014 8:33 pm

so from the centre of the 3rd radius to the centre of the 4th radius what would that need to be ? just looked at the tracksetta and have seen there are quite a few curved pieces but do not know which 1 I would need

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alex3410
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Re: 4 track geometry

Postby alex3410 » Tue Mar 25, 2014 8:39 pm

Not sure to be honest i just popped the bits down on track planning software :lol:

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Dragonfly
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Re: 4 track geometry

Postby Dragonfly » Tue Mar 25, 2014 8:51 pm

67mm is the standard gap between the radii, so 5th radius would be 639mm.

graybc
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Re: 4 track geometry

Postby graybc » Fri Mar 28, 2014 1:37 pm

many thanks to all for your advice
:D

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pete12345
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Re: 4 track geometry

Postby pete12345 » Fri Mar 28, 2014 10:02 pm

Peco make a handy track spacing gauge which can be useful for cases like this. Basically you'd lay your 4th radius curves first, plus the straight track either side of the '5th radius' section. Using a couple of gauges, you can easily curve the flexible track to the right radius and pin it down. You'll need to cut the track to length using a fine saw of cutting disc.
Once an engine attached to a train, was afraid of a few drops of rain...

kristopher1805
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Joined: Wed Mar 28, 2012 3:22 pm

Re: 4 track geometry

Postby kristopher1805 » Tue Apr 01, 2014 9:24 pm

I use a 4 track mainline on my original Towcaster using radius 2,3,4,5 Radius 2 was too tight so on rebuild it went 3,4,5,6 where the distance between centres is 67mm on oo gauge, on the back run I spaced to have a 6 foot way then 10 foot then 6 foot and this looks very nice but the corners have to be 67mm centres to clear mark1 and pullman coaches.
Radius 5 and 6 is flex, in fact its mostly flex but I use factory curves as these are better than flexi for accuracy.

I have also eliminated setrack geometry points so the whole railway is much better, caution do not use Setrack curved points they cause real problems.

[img][IMG]http://i1222.photobucket.com/albums/dd490/kristopher1805/New%20Towcaster/DSCF1141_zps37dda040.jpg[/img][/img]

see if these work


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