BOW
Page
B16
to fit only
U.N
.C.
bolts to them. Where the bolts ore porticulorly tight this may be
due to resin within the threaded portion of the bobbin which can be remedied by
tapping out.
Only the correct length of the bolt should be used, i.e. those whose threod engages
with the full depth of the
bobbiri. No attempt should be mode to pull items up under
heavy load with a small engagement of thread. To avoid
tightening up onto the plain
shank of the bolt it
is
recommerided thot only setscrews be used, i.e. those threaded
all the way up to the head.
Laminating New Bobbin
Firstly the laminates from the basic mounting surface must overlap arid interleave with
the laminates
around the bobbins. Secondl
y
the laminate rnust be well built up under
(9
the bobbin to prevent the bobbiri from pulling out in a downward direction.
This
surrounding laminate should in itself comprise a tight ring around the bobbin to prevent
it from bursting out under diagonal loads but
if
in doubt one or two layers ot tape or
cloth
stiould be wound round the waist of the bobbin. Finally plasticine or similar
plugs should be used during laminating to keep the resin out of the bobbin threads.
Wtien properly laid the visible rough side wall will be nearly vertical in line with the
bobbin top profile. In effect a strong reinforcing ring of laminate surrounds the
bobbin and
ihis
ring musk be properly connecied io ihe basic laminait:.
Loyup Around Bobbins
(a)
It
is
important that build
-
up around bobbins
is
as previously described
as bobbins by nature of their application are subjected to higti loads,
and will
break out of the surrounding fibre glass
if
not bonded in
correctly.
(b)
Bobbins must be bolted to mould after
"
mould release agerit
"
has been
applied
and prior to Gel
-
coat
application.
Care must be taken to
ensure that it sits well down on to the mould, ond that
the bobbin
is
pdsitioned correctly in accordarice with the specification concerned.
DO
NOT
apply Gel
-
coat to the bobbin surfaces or sides.
It
is
essential to keep the Gel-cwt to a minimum thickness to prevent
"
crazing
"
and desirable thot the general layup thickness tapers
gradually away from the bobbins.
4
ESPRIT
Issue
04/78
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