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The G-Scale Plexiglas sensor mount is made up of 5 pieces of 1/4"
Plexiglas. They are screwed together to make a "U" shape with
two feet extending to the sides. Holes are drilled in the feet
so that long nails or other fasteners can be pushed through to hold
the mount to the ground.
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The trickiest part of the construction is drilling opposing 1/4"
holes in the sides on precisely 1" centers. These holes will
hold the emitters and detectors. This was simplified somewhat by using a milling vise on a drill press
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The emitters and detectors are glued to pieces of 1/4" tubing.
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A series of smaller pieces of plastic and brass tubing are
inserted in front of the emitters and detectors to produce the
smallest useable dot of IR light.
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Sensor wiring is shown here.
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The completed unit is high and wide enough to allow just about any engine and train to clear.
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