2nd to 3rd radius crossover

I have just bought (Hornby): 2 L/H Curved Points R8074 2 R/H Curved Points R8075 4 2nd Radius Double Curves R607 2 2nd Radius Curves R606
4 2nd Radius Half Curves R643 2 Short Straights R610
I have tried to use this to make a crossover (not sure of the proper term) from the 2nd to the 3rd radius and back again. This is shown in the Hornby Trackplans book at the bottom left of page 29 (and until my IP address changes at
http://81.86.213.82/rail.jpg ). In the trackplan booklet it says that this arrangement should be square across at the ends and should have the standard track spacing of 67mm centre-to-centre but it doesn't. I could force the tracks to connect properly to the rest of my layout but this would leave gaps and given how well the rest of my Hornby track fits together it would be a pity. Does anyone have any advice? Has anyone else got this arrangement working? Your help is greatly appreciated. Alex
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On 08 Aug 2003, "Alexander Lamaison"

I don't know if they're any different , but there are diagrams on the back of the points package.
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Martin S.

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wrote:
Has anyone else got this

Not familar with those curved points having changed to Peco Streamline long ago but looking at the diagram I would suggest that they are of odd radii compared to the rest of the system as normally the outside curves would be third radius pieces R608 and R609 and not the second radius pieces R606 and R607 - note the need to insert a tiny straight R610 to extend the length of the outer curve. The result of this would be different distances between the tracks.
Other thoughts:
Check the track you have is definately what you think it is - I bought a small amount last year to form a test track and discovered that one of the curves wasn't what I had asked for.
In the past I have encountered Hornby track plans where a joint or joints are not wholly correct and looking at the diagram could this be why 2 R606s are shown back to back when a R607 could be used instead.
Mike Parkes snipped-for-privacy@mphgate.removetoreply demon.co.uk
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wrote :

Hornby 8074/5 and Peco ST244/5 curved points supposedly have the same geometry. Note that the inside curve is equivalent to 1 second radius curves, i.e. R606 plus R643. The outer curve is equivalent to one R606 plus approx. 67mm of straight track.
If it helps, here's a link to the instructions on the package:
http://home.cogeco.ca/~msmodels/hornby/R8075inst.jpg
You can always use flextrack to "make it fit".
--
Martin S.

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Alexander Lamaison wrote:

Hi Alexander,
I suggest that you go back to first principles: Lay out 2nd and 3rd radius curves on the baseboard for the parallel curves you want connected. Draw around these track sections on the baseboard, marking the joins and remove the track sections. Lay the curved turnouts on the marked curves and first see if they line up with the marked lines of the standard track sections. Select one of the turnouts as the "master" and ensure this one fits the curve geometry. (perhaps with filler sections cut to suit) Now you need to find a position on the other curve where the second turnout can sit so that the cross-over track can be aligned. This will involve sliding the turnout around the drawn lines and finding a straight or curved track section to fill the gap.
You will probably find that sighting along the rail gives you a better view for finding misaligned rails than viewing from above.
Regards, Greg.P.
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It doesn't work that way.
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MartinS wrote:

So give up. ;-)
Seriously, why won't it work that way? My impression is that the track is either from the Roco factory or that the dies originated at the Roco factory - perhaps now operated by some other factory. I laid medium radius Roco curved turnouts this way.
Regards, Greg.P.
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As I indicated in another post, it gives full details on the box, using second-radius curves.
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Thank you everyone for your replies. Unfortunately I still can't get it to work. I have it set up exactly as on the back of the box (thanks for the link) but it still won't fit
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