Subject:
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Re: Articulation with "working" connecting rods
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Newsgroups:
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lugnet.trains
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Date:
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Tue, 5 Sep 2006 16:30:03 GMT
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Viewed:
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2539 times
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Ok I think I have something.
Each cylinder is free to slide longitudinally on the frame. This movement is
constrained by a vertical pin (or 1x1 round brick) on each side of the pilot
truck. These pins engage a transverse groove (currently a pair of plates with a
1-brick gap between them) on the underside of each cylinder to keep them roughly
centered between the pilot truck wheels on each side.
A quick and dirty MSPaint rendition
(http://www.users.on.net/~sdyson/lego/cylinders.gif). Black is the pilot bogie
frame, magenta is the main locomotive frame centreline, blue represents the
pilot wheels, and red and green are the cylinders. The black circles are the 1x1
round bricks engaging the slots on the cylinder assemblies.
The limits on cylinder size are still more restrictive than if they were purely
cosmetic and fixed to the pilot bogie, but they can be larger than ones fixed to
the main frame. This seems to work in an MLCad mock-up I made. However it's all
fiddly and I haven't yet designed a robust version, and I probably won't bother
with the model I'm working on.
Thoughts?
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Message has 1 Reply:
 | | Re: Articulation with "working" connecting rods
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| (...) That even more complicated than I what I did (URL) but it might just work. You will have to make the piston rods long enough to not drop out of the cylinders when thay are int he extended foward position. Tim BTW obviously I had a lot more (...) (18 years ago, 5-Sep-06, to lugnet.trains)
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Message is in Reply To:
| | Articulation with "working" connecting rods
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| I'm trying to design an 8-wide 4-8-4 using Big Ben's wheels (CAD only, I'm but a poor student), and want the loco to be able to negotiate standard Lego curves. As the leading truck has an axle each side of the cylinders, I'm finding it hard to keep (...) (18 years ago, 4-Sep-06, to lugnet.trains)
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