Subject:
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Pneumatic switches
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Newsgroups:
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lugnet.trains
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Date:
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Fri, 23 Oct 1998 04:44:00 GMT
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Viewed:
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2889 times
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Hello All,
Some time ago, I used large technic pistons to switch Lego switch track.
There were instructions on my webpage and which I eventually removed, because
I wasn't happy with the design.
Well I'm back again to address the same issue in a slightly different way,
using a small technic pnuematic cylinder this time with a modified switch
track.
First, I modified a switch track per Steve Barile's very detailed instructions
on the PNLTC web page (www.pnltc.org) This change took at most five minutes
and found it very easy with an exacto knife as my only tool.
After the modifcation, the switch could easily be switched from one position
to the next with little difficulty.
Then the fun part, building the pneumatic switch. You will need the following
parts:
(1) small technic cylinder
(1) 1x2x1 brick with side peg
(1) gray technic connector peg
(1) modified switch track
Pneumatic hoses, valve and a pump.
Instruction.
1) Place the gray technic connector peg on the small yellow extension on the
switch track activator arm. This is a friction connection
2)Connect the 1x2x1 brick with side peg to the base of the small pneumatic
cylinder
3)Connect the cylinder and brick to the gray technic connector peg on the
yellow switch arm, with the 1x2x1 brick with side peg on the side closest to
the track. Press the 1x2 down to the base of the switch track, immediatly
adjacent to the track.
4)Connect hoses, valve and pump and you are done.
I've found this to be very reliable and simple solution that takes up very
little additonal space outside the base of the switch track.
Try it out and let me know what you think. At this point, I'm planning to use
it in other places on my layout.
Ben Fleskes
PNLTC
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