Subject:
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Re: BBB wheels + availability?
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Newsgroups:
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lugnet.trains
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Date:
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Mon, 22 Dec 2003 00:09:08 GMT
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Viewed:
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1432 times
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In lugnet.trains, Teunis Davey wrote:
>
> Has anyone worked out how to get the push rods to work perfectly ??
>
> On these combo's ,4 4 0 , 4 6 2 , etc ??
>
> I've had a look ,at a real steam train, at a local park. And I found that the
> push rods are in the same position, on both sides.
That may be (as lar said) because it's a static display.
> But ,in my lego versions they
> work better 90D apart. Is this what the counter balance on the wheels fixes in
> real life ? Or is just the downward weight on the wheels?
No the counterbalance is only to balance (as much as possible) the weight of the
connecting rod and bearing on the wheel. You'll notice the counter weight is
much larger on the driver that is connected to the piston, as that bearing needs
to carry an extra con rod.
The quartering is to ensure that on a 2 cylinder engine, only one piston can be
"dead centred" http://www.thefreedictionary.com/dead%20centre, and thus the
engine can always be started from full stop without being pushed. That is also
why your LEGO model works better when quartered.
ROSCO
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Message has 1 Reply:
 | | Re: BBB wheels + availability?
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| (...) Think of it as a physics problem, since that is what it is. If the two connecting rods (one each side) are at 180 or 0 to each other, then when one is at a end, the other is at end as well. When you push on one or the other of them, nothing (...) (21 years ago, 22-Dec-03, to lugnet.trains)
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Message is in Reply To:
| | Re: BBB wheels + availability?
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| (...) Has anyone worked out how to get the push rods to work perfectly ?? On these combo's ,4 4 0 , 4 6 2 , etc ?? I've had a look ,at a real steam train, at a local park. And I found that the push rods are in the same position, on both sides. But (...) (21 years ago, 20-Dec-03, to lugnet.trains)
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