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 19:56:08 GMT
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Viewed:
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10830 times
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In lugnet.trains, Sebastian Dyson wrote:
> 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?
That even more complicated than I what I did
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=1755136 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 room to play with
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Message has 1 Reply:
 | | Re: Articulation with "working" connecting rods
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| (...) Which will introduce another problem - the piston rods will hit the wheels when they extend out the front of the cylinder. I had that exact same problem on the X class, but managed to work it so they just miss. It's very close though. ROSCO (20 years ago, 5-Sep-06, to lugnet.trains)
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Message is in Reply To:
| | Re: Articulation with "working" connecting rods
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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 (...) (20 years ago, 5-Sep-06, to lugnet.trains)
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