Help: Smooth Curves Problem

How do I get the curve below to be smooth. The distance traveled between the 25 m is 3.8 m to the left. I have tried using Switch with the distance set at 3.8 and 1.9 for the curve but neither work.In need of help desperatly!====================
James Dickinson
www.brj.rr.nu - BVE from around the UK.

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RE: Help: Smooth Curves Problem, Stooopid_person, Oct-05-03, 07:49 AM, (1) RE: Help: Smooth Curves Problem, Stooopid_person, Oct-05-03, 07:51 AM, (2) RE: Help: Smooth Curves Problem, jsdickinson, Oct-05-03, 08:29 AM, (3) RE: Help: Smooth Curves Problem, Stooopid_person, Oct-05-03, 08:39 AM, (4) RE: Help: Smooth Curves Problem, Simon_G, Oct-05-03, 09:57 AM, (5) RE: Help: Smooth Curves Problem, jsdickinson, Oct-05-03, 10:04 AM, (6) RE: Help: Smooth Curves Problem, Simon_G, Oct-05-03, 10:12 AM, (7) RE: Help: Smooth Curves Problem, jsdickinson, Oct-05-03, 10:25 AM, (8) RE: Help: Smooth Curves Problem, Stooopid_person, Oct-05-03, 10:40 AM, (9) RE: Help: Smooth Curves Problem, Simon_G, Oct-05-03, 11:02 AM, (10) RE: Help: Smooth Curves Problem, smikes, Oct-05-03, 01:39 PM, (11) RE: Help: Smooth Curves Problem, jsdickinson, Oct-07-03, 02:24 PM, (12) RE: Help: Smooth Curves Problem, Simon_G, Oct-07-03, 05:12 PM, (13) RE: Help: Smooth Curves Problem, jsdickinson, Nov-14-03, 02:05 PM, (14) RE: Help: Smooth Curves Problem, StephenCross, Nov-14-03, 02:39 PM, (15) RE: Help: Smooth Curves Problem, TomBoyRacer, Nov-14-03, 05:04 PM, (16) RE: Help: Smooth Curves Problem, Simon_G, Nov-14-03, 06:07 PM, (17) RE: Help: Smooth Curves Problem, jsdickinson, Nov-15-03, 12:06 PM, (18) RE: Help: Smooth Curves Problem, StephenCross, Nov-17-03, 07:50 AM, (19)

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>How do I get the curve below to be smooth. The distance
>traveled between the 25 m is 3.8 m to the left. I have tried
>using Switch with the distance set at 3.8 and 1.9 for the
>curve but neither work. If you searched the forums, i aske dthe same question and someone gave me a formual for it. I'll find the post for you.

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LAST EDITED ON Oct-05-03 AT 07:52 AM (EDT)

Here it is
http://www.train-sim.com/dcforum/DCForumID17/284.html
Assume opposite track is track 0, your own track.

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That formula is useful in other circumstances but we are the far left hand track. I just need to find the curve width for moving 3.8m over 25m, I think?====================
James Dickinson
www.brj.rr.nu - BVE from around the UK.

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LAST EDITED ON Oct-05-03 AT 08:42 AM (EDT)

>That formula is useful in other circumstances but we are the
>far left hand track. I just need to find the curve width for
>moving 3.8m over 25m, I think? So you are on the straight track? Then the above formula is exactly what you need! You know the distance between the two tracks, so use that formula and calculate the curve radius! Do it reverse! Look at the last post. Where I know the distance and calculating curve radius.

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Hi JamesIs this what you're after? The green line shows the curve you want to give an offset of 3.8m after 25 m. The formula is dx = L²/(2*r) where r is the radius of the curveso r = L²/(2*dx)Plugging in dx=3.8m and L=25 gives r = 625/(2*3.8) = 82.23m Trying L=50m gives r = 2500/(2*3.8) = ~330m Hope this is of use
Simon

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That I think is what I was after! Thank you sir. Will try this out later, a bit Smooth Curved out, there are too many points in Orpington .====================
James Dickinson
www.brj.rr.nu - BVE from around the UK.

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Sorry, forgot to add...Spreading the curve over 50m, you'll need the offset after 25m: for r=330m this isdx = 25²/(2*330) = 0.95mCheers
simon

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Hmmm... Didn't work. See below. I might just leave it non-smooth, Orpington is starting to get annoying .====================
James Dickinson
www.brj.rr.nu - BVE from around the UK.

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Using the formula in the link I have gave you,>Distance = length * sin( length* 90 / (PI * radius ) in
>degree.3.8 = 25*sin{(25*90)/(PI*r)}
3.8 = 0.42261{2250/PI(r)}
3.8 = 950.8725/PI(r)
3.8PI(r) = 950.8725
11.938r= 950.8725
r = 79.65Try using 80m radius.

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>.... I might just leave it non-smooth, ...Noooooo!!! Anything but that.Ok. Have a look at the attached. Rail 2 is the one we're interested in (your labels may differ) and the distances are just for convenience. Lets assume that at 100m, Rail 2 is 8m to the right of Rail 0.Your route should look something like this:25m Rail 2: x = 8.00-3.80 =4.20; curve = -330
50m Rail 2: x = 8.00-0.95 =7.05; curve = -330
75m Rail 2: x = 8.00; curve = 0 (straight)
100m Rail 2: x = 8.00; cuvre = 0 Notice that the curve occupies two 25m blocks, but it ends at 75m and the block from 75m to 100m (adjacent to the points on Rail 3) is straight.(Alternatively, end the curve at 100m and make a curved turnout object for Rail 3 )> ...Orpington is starting to get annoying Can't wait for those three-way points at the south end

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LAST EDITED ON Oct-05-03 AT 01:47 PM (EDT)

From the looks of what you want to do with one 25m curve piece,you can find the right curve radius but you also have to put the piece before the curve at the correct angle to the piece after the curve.Your trying to make a curve thats in one direction look good on both ends,but for it to look good as you've got it in the picture you curve right coming off the first piece and then left to get to second piece.Try moving the end before the curve more to the right and tweaking that and the curve until it looks good.

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Progress just need to mirror it . See below, tried changing the radius to a minus but it went across my tracks and tried changing radius of curve object and got zig-zags! Hmm... please say that I am not back to square one.====================
James Dickinson
www.brj.rr.nu - BVE from around the UK.

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Hi JamesAs you say - nice curve; wrong direction! Try starting from the other end of the curve, by the points, and working back towards the diamond.If we call the x-offset through the platform X, then the offsets in the curve will be:At the points: X
25m back from the points: X - 0.95m
50m back from the points: X - 3.8mCheers
SimonPS - Don't worry at this stage if the result doesn't join up neatly with the diamond, you can work on that later.

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Sorry to bring this up but I am really strugeling with this problem.Simon if you see this can you please contact me through the PM system here, and we can have a chat.Ciao for now, oh and I may not be around here for the next few weeks due to GCSE Mocks, I hate revising and then exams, ugh!====================
James Dickinson
www.brj.rr.nu - BVE from around the UK.

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Hi James,If this is all you need to be fixed, I will put the Northern Line aside for a few minutes and help you out. So then send it to me and I will do it for you. I know track laying is a pain, but with the TrackViewer it has become a tad easier.Bye for now,Stephen.

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could you tell me:
how far apart your tracks are (normal spacing)(i'm guessing 6 foot?)
"-------" between platforms
how far to the right your points go
how far from the points to the start of the platforms.
i should be able to come up with something tomorrow

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James you have PM!Simon

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Guys the smooth curve man (Stephen Cross) is on the case for the whole route! But thanks very kindly for your offers.====================
James Dickinson
www.brj.rr.nu - BVE from around the UK.

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Hi James,The whole route (at least to Orpington Sidings) is complete. You might need to drive the whole route a couple of times to make sure I haven't stuffed up the sounds or track placements.James your route looks great and I can't wait to see it finished. Check out what I have done and let me know if any changes need to be made or additional trackwork added.PS Where should I send the files too?Bye for now,Stephen.

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