Subject:
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Re: New Track radius question
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Newsgroups:
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lugnet.trains
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Date:
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Fri, 6 Sep 2002 17:17:35 GMT
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Viewed:
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972 times
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In lugnet.trains, Matthew Bates writes:
> > Questions:
> > 1) How far a part should the tracks be around a curve?
>
> I think the radius of a larger curve should be 56 studs, i.e. 16 larger than
> the current radius of 40 (not 20). This would put parallel tracks 16 studs
> apart just like they are with the current points. I haven't thought about
> clearance but I'm sure this would be more than sufficient. I think any other
> geometry would be messy. For example 56 equals 7 straights so an S curve can
> be made just like 5 straights equal an S curve made with the current curves. See
>
> http://www.ngltc.org/train_depot/geometry.htm
>
> Why are you asking? Are you proposing new track designs to Lego? If so how
> about some new points as well like...
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> http://www.ngltc.org/train_depot/newpoint.htm
>
> Matt
Steve, Mike, and Matt: Thanks for thinking and posting about this larger
radius of curvature...and so long ago! I'm playing catch-up!
I did a little sketching of the current track geometry and a few circles of
radius = 56 studs (56 studs to center of track curve). Once, again, thanks
to Matt Bates, for you (his) Track Designer application.
Two track configuration illustrations:
1) Looping cross track with 56 stud radius of curve
- each end of a 3/4 circle of 56 stud radius of curve connects to
a cross-track with qty 3 sections of 16 stud long straight track
sections.
2) Dog-bone with switches for parallel curve passing siding
- Use standard current radius curve (40 studs) section upon exit of
switch turn-out in an orientation to create a parallel siding.
- Continue same curve direction with larger radius of curve.
- Ah, never mind...see the pictures, please.
Please not that the two images shown here are the same: One is a bitmap
(231KB) and the other is a GIF (31KB).
http://www.brickshelf.com/cgi-bin/gallery.cgi?f=24729
I included the bitmap in the case someone might want to download the bitmap
and count pixels.
Here's a deep link to the GIF:
http://www.brickshelf.com/gallery/jamathis/Trains/TrainsOther/LargerTrackRadius/v1/a_track_radius_increase_parallel_v2e.gif
And a deep link to the bitmap:
http://www.brickshelf.com/gallery/jamathis/Trains/TrainsOther/LargerTrackRadius/v1/track_radius_increase_parallel_v2e.bmp
Matt, your "newpoint" shown via the link above is really intriguing!
later,
James Mathis
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Message has 2 Replies:
 | | Re: New Track radius question
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| (...) I have skirted the issue by using curve-straight-curve...aight-etc. for most of my turns, which comes out to be about a 72 stud radius. One note: I don't use points, except in a train yard (so basically for looks). And when you get right down (...) (22 years ago, 6-Sep-02, to lugnet.trains, lugnet.dear-lego)
| | | Re: New Track radius question
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| (...) outer half-circle illustrates it best. What you want to be able to do is to take a quarter circle with a straight added to each end, and have your new curvature fit that. Anything else is just asking to complicate the geometry even further. 16 (...) (22 years ago, 20-Sep-02, to lugnet.trains)
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Message is in Reply To:
| | Re: New Track radius question
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| (...) I think the radius of a larger curve should be 56 studs, i.e. 16 larger than the current radius of 40 (not 20). This would put parallel tracks 16 studs apart just like they are with the current points. I haven't thought about clearance but I'm (...) (24 years ago, 11-Dec-00, to lugnet.trains)
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