Make hole for aileron-cable in foam-wings.
Since I apply balsa to foam-cores using vacuum-bag technique, holes for cabeles etc. must be made after the balsa is dlued in place. Below is a description of how I do it.
The
basic tool, a brass-tube sharpened at one end.
To
make sure that the hole ends up in the correct place, the tube mst be lined up
relative to the wing. Here the angle relative to the table is made with a
piece of alu-tube.
The
other direction is aligned with a long straight-edge from the servo-well to
entry-point in wing-root.
Drilling
is done manually by twinsting and pushing the tube. It's vital to ceep a
rotation to cut through the foam. Do not try to drill more than 10-15cm at
a time, clearing the interior of the tube between each step.
Done,
a smooth straight hole for aileron-cables.