Changewheel Shear Pin (Fig. 1)
A protection against accidental overload in
the
end gear train
is
provided in the
form
of
a shear
pin
fitted
in the splined
sleeve
on
the
top
changewheel shaft.
In
the
event
of
replacement being
necessary a 4
mm
(5/32")
diameter x
20
mm
(3/4")
long
mild
steel
pin
should be
fitted
as
follows: •
Remove
the
hexagon
nut,
washer and changewheel, pu 11
off
the
sp
lined
sleeve
and remove the
broken
pin
parts
from
both
sleeves
and shaft.
Fit
new pin.
NOTE:
The
pin
acts in single
shea
r and
wil
l
only
enter the
sleeve
from
the 'big-
ho
le' side.
Leadscrew
Shear
Pin
(Fig.
2,
A shear
pin
device is incorporated
on
the
leadscrew adjacent
to
the
gea
r
box,
as
protect
i
on
against
overload.
Instructions
for
replacing
the
shear
pin
are
as
fo
ll
ows
:•
Remove
the
torque
limiter
cover plate.
Disengage shear
pin
assembly
by
sl
idi
ng away
from
gearbox face.
Rotate spring steel cover
on
its locating sl
eeve
unt
il
access
slot
is
exposed.
Release
M5 dog-point set screw
in
sleeve
and rotate sl
eeve
and cover
until
shear
pin
is exposed
through sl
ot
.
Replace shear pin
as
shown in ill
ustration
(2)
and re-assemble ensuring th
at
the dog
point
of
the
M5
set
screw
is
cor
rectly located.
Drive Belts
(F
ig. 3 and
4)
Access
to
the
Drive
Belt
is
gained
by
removal
of
the
mou
lded end guard when
vee
Belt tension may
be
assessed
by
applying finger pressure on the
belt
at
a
po
i
nt
midway
between the
two
pulleys
(f
i
g.
3).
For
correct
tension a
deflection
of
about
10
mm
should
be
possibl
e.
To
adjust
the
vee
belt
tension -
re
l
ease
the lock
nut
on
the adjusting screw (fig.
4)
to
increase
tension, tighten screw against
the
bed
until
correct tension is obtained then re-tighten lock
nut.
It
is
important
that
when making adjustments a straight
edge
be placed accross
the
face
of
each pulley
to
ensure that correct alignment is maintained.
Saddle Strips {Fig. 5 and 6)
Wear
on
the
rear and
front
saddle strips
may
be accommodated
by
adjustment
of
the retaining
sleeves
located in
the
top
face
of
the
saddle;
two
for
the
rear and one each
for
the
two
front
strips.
The procedure
for
adjustment
is
to
first
release
the
socket head screw, sl
ightly
turn
the
slotted
head
sleeve
anti
-clockwise and then re-clamp the cap screw. Care should be taken
to
avoid
over adjustment; a
30°
turn
at
the
sleeve
represents approximately 0.1
mm
(.004") take up in
the strip.
Tailstock Bed Clamp (Fig.
7)
The angular lock position
of
the
bed clamp lever
is
adjusted
by
means
of
the self-locking
hexagon headed
bolt
located
on
the underside
of
the
tailstock and between the bed ways.
continued
19
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