387
28
Your assembly should now look like this, with the spur gear and the pinion gear
neatly interlocked. Check that the two gears can move without too much resistance
and that the teeth engage smoothly. If the gears are not aligned, or the teeth don’t engage
properly, repeat Steps 24 to 28.
29
When you are sure that the gears
are meshing correctly, carefully
turn the chassis over once more and fully
tighten the dome-headed screws so that
the engine will not move on its mount.
25
Carefully position the gears so that
your assembly looks like this, with
the two gears pinching the cardboard
strip between them. Check again that the
gears are perfectly parallel to each other.
26
Holding the engine carefully in
place, turn the chassis over again
and, using the screwdriver, tighten the four
dome-headed screws until they just begin
to bite. Do not tighten them fully at this
stage.
27
Turn the chassis over again and
check that the gears are still
correctly aligned. If not, repeat Steps 24
to 27 until they are. When the gears are
aligned, pull the cardboard strip out from
between them (red arrow).
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