Subject:
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Re: Making train switch control unit modularized
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Newsgroups:
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lugnet.org.ca.rtltoronto
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Date:
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Tue, 23 Mar 2004 00:31:38 GMT
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Viewed:
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986 times
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In lugnet.org.ca.rtltoronto, Jason J. Railton wrote:
> In lugnet.org.ca.rtltoronto, David Koudys wrote:
> > Since adding motorized switch units to my LEGO track Wyes, I needed to come up
> > with a good control unit. My first was 4 switches built into one box.
> >
> > Then I thought, "Hey! What if I wanted to expand? Add more switches??"
> >
> > Inspired by rtlToronto robot building competitions, I looked into building
> > modular control switches. In this way, I could add on more switches as needed
> > (and as I acquire polarity switches--I'm all out!)
> >
> > So with much further ado, see the "Dave's modular motorized Wye Controlling
> > Switches Version 1.0" here
> >
> > http://sparky.i989.net/lvtrain.htm
> >
> > On this page are also steps for building the actual motorized wye switch unit as
> > well.
> >
> > Anyway, as per usual, questions, comments or anything else you feel like sending
> > in my general direction is quite okay.
>
> Dave - the switch is a neat construction, but I couldn't figure out how the
> motor activates the switch. Could you explain?
>
> There is a more compact way of using the polarity switches though. If you poke
> the tip of a classic space 4-long antenna into the axle hole, you can operate it
> without it latching. You then stretch a rubber band along your line of
> switches, passing just in front and behind of the antennae, and they'll all
> auto-centre.
>
> Jason Railton
The bottom of the #5 angle connector goes over the outer bracket on the switch.
As like many other motorized switches, the pulleys rotate, moving the #4 axle
back and forth, which moves the #5 angle connector back and forth, which moves
the actual train switch back and forth. It works pretty much flawlessly for
me--the motorized unit sits right on top of the switch itself, and never comes
loose.
I think in the CAD diagrams, I have the 1x3 lift arm in the wrong location, but
a wee bit of finagling and I'm sure most builders can set that up properly.
I'll try to redo the CAD diagrams.
Thanks for the heads up on the polarity switches! I'll try that tonite!
Dave K
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