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Synchronization of Exhaust Chuff
Focus Distance
1/8" - 3/16"
Optical Coupler (hi-lighted for ease of
viewing) mounted to frame 3/16" from
optical end to pattern. In this installation,
the end mounting ears had to be trimmed
to obtain clearance to the drive gear box.
When doing so care must be used to not
damage the optics.
It is not necessary to use the black / white stripe pattern, anything that will come in and
out of focus to the optical reader will work! So, engines with cams installed or a piece of
rectangular tubing cut and mounted to the axle may also work with proper alignment.
Remember, some paints and other type markers will still reflect the infra-red light. So,
just because it's black doesn't guarantee that it will work. The optical coupler comes
with laser printed stripes.
Make a cardstock cutout with an opening for the speaker. Mount the cardboard cutout with "Hot
Optical pattern
mounted on
drive axle
apply a thin layer of
glue on each side to
prevent oil from
contaminating the
It is best to have the sound projected up instead of down. To do so, locate the highest part of
optical pattern.
the existing coal pile. Use a small, sharp, drill bit (#60) to open a series of holes within the
speaker cone diameter. Always drill slowly so the plastic does not melt.
Mount the speaker with "Hot Melt" or glue. Be sure to cover all sides of the speaker so no air
can escape.
11
Sample Speaker Installations
Open top Tender
Melt" or glue. After the cutout sets, mount the speaker Be sure to cover all sides of the cutout
to the tender and speaker so no air can escape.
Closed top Tender
In larger tenders with a lot of air passage between the
tender top and frame, it may becomes necessary to
make your own enclosure as shown here. Especially if
you don't want to drill the top open (or it's an oil burner).
If you have other openings, be sure to close them.
top view of completed speaker
installation.
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