Subject:
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Re: Roller Doors into a Baggage Car
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Newsgroups:
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lugnet.trains
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Date:
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Fri, 18 Jul 2003 21:55:38 GMT
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Viewed:
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978 times
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James Mathis wrote:
> Excellent! Thanks for taking the time to investigate this
> construction, finding and reporting its real-brick faults, and
> tackling some corrective design approaches.
No problem - it's fun!
>> The channels created by the 2x1 panels have too much freedom - the
>> door can slide left and right in a 10 wide, but the garage door
>> won't fit in 9 wide - 9.5 seems optimum!
>
> Oooh, 1/2-brick length change. Maybe going for two side-by-side roll
> up doors would return the overall length to an integer value?
I had an idea which works, and also solves one other problem, which is
that the 2x1 panels supported by only one pin are a bit loose. If you
add a single 1x6 plate behind the panels, it takes up some of the slack
and makes the panels more rigid.
> Well documented, Alastair. Perhaps your dreams will realize a great
> solution.
As they did (worryingly). Well, lying in bed anyway, away from the
problem. I went back to basics - i.e. the original garage door layout.
It involves no other moving parts, so I abandoned the tyres and instead
went for smooth curved bricks to carry the door over. And as I've just
got a digital camera (albeit third hand!) I took some shots to
demonstrate what I'm on about. Apologies for the quality - the battery
was nearly out, so no flash, as I wanted to get these up tonight.
You'll find them temporarily at:
http://www-users.york.ac.uk/~acd114/temp/mathis1.jpg
http://www-users.york.ac.uk/~acd114/temp/mathis2.jpg
http://www-users.york.ac.uk/~acd114/temp/mathis3.jpg
I've also made numerous colour substitutions, and I'm working on finding
a working solution rather than making it look good at this point.
In image 1, hopefully you can see that the roof is upside down. This is
to give a smooth surface underneath - one of the problems with the
original design was that the door snagged on the underside of the
plates. The odd handle above the door in the centre is the only way
I've found thus far to encourage the door back over the curve without
snagging up at the top. With this in place, you can just about get away
with only a 1 plate clearance for the door in the centre of the car, as
the pressure you apply will push it through there (previously it was
just causing the door to go into holes). Even with a two plate
clearance, the handle is still needed for reliable operation. In fact,
I've tried this out again, and I'd leave two plates - one is still open
to some sticking problems!
Image 2 just shows the curves inside slightly more clearly.
Image 3 shows the door open at maximum (2/3rds up). The left hand
pillar is still offset half a plate (but I think one plate nearer the
middle than the original), the right I've not offset, due to the extra
plate inserted behind the panels. Incidentally there's only room for
that plate on one side - you could extend the whole car by one or more
studs to put more in on both sides until the optimum door width is
reached. At present, there's 6.5 studs between the two support pillars
- less, I guess, than desired.
You can also see something brown and vertical - I've added a 1x4 tile to
narrow the width of the channel, which works well. At maximum opening,
you can push the handle part of the door onto the little ledge created
by the two tiles to keep it from sliding down - an unanticipated bonus!
> I think this garage door style will look good once we find a good
> construction.
Yes. My adaptation so far has a few problems - the height needed at the
top makes this quite a high car, and there's the ugly handle at the top
of the door. But it works reliably - well, comparatively anyway. So
how can we refine it further?
Alastair
--
LEGO creations: http://www-users.york.ac.uk/~acd114/lego/lego.html
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Message has 1 Reply:
 | | Re: Roller Doors into a Baggage Car
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| (...) <snipped loads of description; a good read> Excellent execution to this challenging design. I don't have the time right now to discuss. Gotta run. But, that gives me some time to think about working from you mods. Thanks! later, James Mathis (21 years ago, 18-Jul-03, to lugnet.trains)
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Message is in Reply To:
| | Re: Roller Doors into a Baggage Car
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| (...) Excellent! Thanks for taking the time to investigate this construction, finding and reporting its real-brick faults, and tackling some corrective design approaches. (...) Oooh, 1/2-brick length change. Maybe going for two side-by-side roll up (...) (21 years ago, 18-Jul-03, to lugnet.trains)
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