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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
104
BORING
HOLES
IN
WOOD.--It
should
be
a
strict
rule
that
no
spar
be
used
which
has
an
unnecessary
hole
in
it.
Before
boring
a
hole,
its
position
should
be
confirmed
by
whoever
is
in
charge
of
the
workshop.
A
bolt-hole
should
be
of
a
size
to
enable
the
bolt
to
be
pushed
in,
or,
at
any
rate,
not
more
than
gently
tapped
in.
Bolts
should
not
be
hammered
in,
as
that
may
split
the
spar.
On
the
other
hand,
a
bolt
should
not
be
slack
in
its
hole,
as,
in
such
a
case,
it
may
work
sideways
and
split
the
spar,
not
to
speak
of
throwing
out
of
adjustment
the
wires
leading
from
the
lug
or
socket
under
the
bolt-head.
WASHERS.--Under
the
bolt-head,
and
also
under
the
nut,
a
washer
must
be
placed--a
very
large
washer
compared
with
the
size
which
would
be
used
in
all-metal
construction.
This
is
to
disperse
the
stress
over
a
large
area;
otherwise
the
washer
may
be
pulled
into
the
wood
and
weaken
it,
besides
possibly
throwing
out
of
adjustment
the
wires
attached
to
the
bolt
or
the
fitting
it
is
holding
to
the
spar.
LOCKING.--Now
as
regards
locking
the
bolts.
If
split
pins
are
used,
be
sure
to
see
that
they
are
used
in
such
a
way
that
the
nut
cannot
possibly
unscrew
at
all.
The
split
pin
should
be
passed
through
the
bolt
as
near
as
possible
to
the
nut.
It
should
not
be
passed
through
both
nut
and
bolt.
If
it
is
locked
by
burring
over
the
edge
of
the
bolt,
do
not
use
a
heavy
hammer
and
try
to
spread
the
whole
head
of
the
bolt.
That
might
damage
the
woodwork
inside
the
fabric-covered
surface.
Use
a
small,
light
hammer,
and
gently
tap
round
the
edge
of
the
bolt
until
it
is
burred
over.
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