building a helix in oo

Discussion of model railway baseboard design and construction
waldron
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building a helix in oo

Postby waldron » Tue Dec 11, 2007 4:30 am

hi there could anyone give me details on how to build a helix in oo scale it is only to drop down just under my layout so that i can get a fiddle yard in my layout! I would use another one at the otherside of the layout to bring it back up to normal level, just need the sizes for it! i would like to have two tracks on it if i could!

Thanks G

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Ironduke
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Postby Ironduke » Tue Dec 11, 2007 5:55 am

there's the Noch helix kit but basically you just need to cut identical circles from plywood or mdf and form them into a helix using some vertical struts and then lay flexible track up it. You can make it any size you want as long as the incline isn't too steep and the radius isn't too tight for your trains

here's the link for the Noch solution anyway Gaugemaster - Noch helix thingy
and some more links
http://www.duff-family.demon.co.uk/railway/souecl.html
http://mywebpages.comcast.net/blainestr ... ewSLF.html
http://www.atlasrr.com/Layoutphotostuff ... lix-01.jpg
http://www.modellbau-menninghaus.de/fer ... ge0_gr.jpg
Regards
Rob

mumbles
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Postby mumbles » Tue Dec 11, 2007 8:23 am

hi
i may be getting the maths wrong here
but.. if you are looking for the circle to come fully round and under itself
and you are working to a 1:30 gradient then to drop 100mm.. [which is a good clearance and some]
the circumference of the circle must be 3000mm
as we know from school [ ;-) ] the circumference of a circle is 2*pi*R
therefore the diameter would be

(3 000 millimeters) / pi = 0.954929659 meters

may as well say a meter!

ha, maybe someone else can confirm that.. its been a while since i did any maths like that at school
michael

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Flashbang
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Postby Flashbang » Tue Dec 11, 2007 12:10 pm

Hi
If its any help, this supplier himself makes and sells helix loops suitable for "00"/"H0" or "N" gauges. Worth a phone call to see what his prices are perhaps?

http://www.modelshopuk.com/
[Image << Click the Icon to go to my website
Broken? It was working correctly when I left it.

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live-frog
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Postby live-frog » Tue Dec 11, 2007 12:17 pm

mumbles wrote:as we know from school [ ;-) ] the circumference of a circle is 2*pi*R
therefore the diameter would be

(3 000 millimeters) / pi = 0.954929659 meters

may as well say a meter!

ha, maybe someone else can confirm that.. its been a while since i did any maths like that at school
michael

or pi*D even :) oh and the maths looks solid !
Is my tortured brain right in thinking that a helix loop would not be a true circle by reason of the differential height of the ends ? who knows the maths for that ? !! - not me for one !
:shock:

EDIT : I thought Chris Raider was planning one of these ?

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Raider
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Postby Raider » Tue Dec 11, 2007 1:11 pm

I did try and fit one in the loft space using 2nd or 3rd radius curves, but I didn't have the space for it so the plan has been scrapped for now (roof supports got in the way and I didn't fancy the idea of cutting them to make room)

mumbles
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Postby mumbles » Tue Dec 11, 2007 1:37 pm

Raider wrote:roof supports got in the way and I didn't fancy the idea of cutting them to make room)

chicken :lol:

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pete12345
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Postby pete12345 » Tue Dec 11, 2007 4:07 pm

mumbles wrote:hi
i may be getting the maths wrong here
but.. if you are looking for the circle to come fully round and under itself
and you are working to a 1:30 gradient then to drop 100mm.. [which is a good clearance and some]
the circumference of the circle must be 3000mm
as we know from school [ ;-) ] the circumference of a circle is 2*pi*R
therefore the diameter would be

(3 000 millimeters) / pi = 0.954929659 meters

may as well say a meter!

ha, maybe someone else can confirm that.. its been a while since i did any maths like that at school
michael


Note that this should be the radius of the inner track. You should widen the cut to match the width of any other tracks.

Pete
Once an engine attached to a train, was afraid of a few drops of rain...

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headshot119
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Postby headshot119 » Tue Dec 11, 2007 5:37 pm

mumbles wrote: the circumference of a circle is 2*pi*R
therefore the diameter would be

(3 000 millimeters) / pi = 0.954929659 meters



Spot on with the math. though you should of rounded to 2 decimal places. :wink: :lol: :lol:

waldron
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Postby waldron » Tue Dec 11, 2007 5:46 pm

thanks guys! well i dont have any space restrictions or anything in the way so i will give it a bash when i get a chance to got and get some wood! i dont need it to run my layout it was just so i could get a fiddle yard in with out taking up space on my base borads!

Thanks G

waldron
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Postby waldron » Tue Dec 11, 2007 5:54 pm

you are working to a 1:30 gradient then to drop 100mm.. [which is a good clearance and some]


is that from the base board to the curve coming down or is that at the bottom of the helix?

Thanks G[/quote]

mumbles
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Postby mumbles » Tue Dec 11, 2007 6:22 pm

i was working on a full circle to get down 100mm

Note that this should be the radius of the inner track. You should widen the cut to match the width of any other tracks.

actually, it is the diameter :-)
and we'll rounded off to 0.95m ;-)
this would be as you say the centre line of the inner track [assuming double track]
something like this i think;
Image

however
if you built it to these measurements you would still want to test before fixing permanently
with the 100mm clearance there is some room for reducing the gradient if needed

it is also worth adding that gradients may need to be shallower on curves due to the extra friction caused by wheels going around curved track [ i think its friction that causes it]
michael

waldron
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Postby waldron » Tue Dec 11, 2007 7:45 pm

thanks mumbles! thanks for clearing that up for me!

Thanks G

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Raider
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Postby Raider » Tue Dec 11, 2007 8:23 pm

For supporting the helix I have seen people use long threaded bars through the helix. This gives the option of fine tuning the gradients if needed. You can also extend to more than 1 circle to give more of a rise / fall if needed.

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frolly
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Re: building a helix in oo

Postby frolly » Sun May 25, 2008 4:38 pm

Now all this math is great, but after thats all taken care of....

I'm going to use threaded bar for the risers, thats makes it easy to adjust for a get smooth gradient

BUT how do we join each section of the helix to the next?
Frolly from Derby


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