BODY
Page
B14
Bobbins Pulling Out
This
could be caused by overloading e.g. accident damage.
Where the bobbin and
its surrounding area
is
accessible from the rou
g
h side of the laminates either naturally
or by cutting non
-
weakening access holes, the remedy
is
to improvise o local mould
in wood or glass fibre of the body surrounding the finished side of the bobbin.
Difficult
y
may be experienced in temporary re
-
locating the bobbin and its surrounding
laminate in its original position.
A
local mould of the smooth side of the surrounding
area (for
example
6
in (15 cm) beyond in all directions) should eliminate
this
trouble.
Re
-
registering can be achieved by drilling holes through mould and body and through
the bobbin before removing the repair mould.
Additional
4
in (10.2 cm) square patches to make up to:
-
in and
5/16
in bobbins:
I
3
the e
q
uivalent of 5
X
14
oz layers.
3/8
in and
7/16
in bobbins: the equivalent of
7
X
1.4
oz layers.
NOTE:
Number of ~atches to be determined from the above.
The bobbin can then be directl
y
laminated on the old mounting by using the techniques
described arid overla
p
p
in
g
the new laminate on to the old by several inches (centi
-
metres) whenever possible.
-.
I
t~e iarger bobbins are used oniy where rhe ioadings are known ro be
high,
e.g.
body
mountings, seat attachments, etc. Smaller bobbins are used as a
locntory point or a
blind attachment point.
-?
(
Typical instances such as non
-
structural applications are headlam
p
pivots. In these
cases loose bobbins can be repaired by more localised and less exacting means, e.g.
forcing in a dough mixture around
and behind the bobbin; winding tape around it,
etc.
Stripped Threads
Whilst their oval section will prevent these bobbins
from turning in normal use they
may
looser1
if
too much tightening pressure
is
applied, or when an attempt
is
made to
tap them out to a large diameter.
if
a thread
is
damaged or stripped an attempt should
be
made to drill the thread clear and use a bolt and lock nut or drill oversize and fit
helicoil insert. When fitting an initial check should be made with each bolt before
ti
g
htening. Only
U.N
.C.
bobbins are em
p
loyed and particular care should be paid
b
ESPRIT
Issue
04/78
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