Subject:
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Re: Reversing Loop without Insulated Tracks
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Newsgroups:
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lugnet.trains
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Date:
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Wed, 11 Aug 2004 13:00:48 GMT
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Viewed:
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1817 times
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In lugnet.trains, David Laswell wrote:
> In lugnet.trains, Larry Pieniazek wrote:
> > I suggest you read up on reversing loops for some background. There are
> > plenty of references out there if you use Google to look. But, failing that,
> > and also for the benefit of the rest of the readership...
>
> Eh, I'm more interested in the electrical puzzle than the trains running on it.
Many of us are more interested in the trains running (remember that the name of
the group, after all, is not lugnet.electrical). The electrical stuff is just a
way to get trains to do their thing, in my view and hence, less interesting.
Others DO find this interesting and have done a lot of actual research and
documentation to advance the hobby which I for one am very grateful for.
But I'm not sure idle speculation by the uninformed is all that useful, really.
That said, the electrical puzzle IS touched on by the reversing loop writeups I
suggested you seek out, but I guess you wouldn't know that since you apparently
didn't do so.
> Besides, I was considering the possibility that a motor might be set up with two
> input leads and two output leads that would cause skipped poles if only one pair
> of wheels were under power (seemed like a stupid thing to design into a train
> motor, but I've wired up enough motors, including a few with variable phase
> hookups, that I couldn't discount the possibility)
It's easy enough to discount this possibility if you just do a little
research(1) before you start speculating. There are a number of disassembly
photo series out there that make LEGO train motor internals quite clear.
But for your benefit (and the rest of the readership who might be misled by your
uninformed speculation on this topic), it's my understanding that LEGO train
motors aren't set up that way. LEGO motors use a sprung wiper contacting both
wheels arrangement, one wiper per wheel per side, with internal connection to a
single motor input (as it turns out these wipers feed directly to the thermistor
which makes DCC conversion somewhat tricky)
Snipped the rest.
1 - http://www.fgltc.org/bwoabs/9v_12v/9v_12v.phtml or
http://members.shaw.ca/RCXpress/Temp/Gets2k3/DCC.html or this especially good
one http://www.lgauge.com/trains/dcc/dcc.htm .. from there, this picture shows
it VERY clearly: http://www.lgauge.com/trains/dcc/dcc014.jpg
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Message has 2 Replies:
 | | Re: Reversing Loop without Insulated Tracks
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| (...) Yeah, I kinda figured that out on my own, thanks. I just felt it would be prudent to point out that I am not one of those people, so that I wouldn't be the subject of false assumptions. Well, no more than usual, at least... (...) Considering (...) (20 years ago, 12-Aug-04, to lugnet.trains, FTX)
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Message is in Reply To:
| | Re: Reversing Loop without Insulated Tracks
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| (...) Eh, I'm more interested in the electrical puzzle than the trains running on it. Besides, I was considering the possibility that a motor might be set up with two input leads and two output leads that would cause skipped poles if only one pair (...) (20 years ago, 11-Aug-04, to lugnet.trains)
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