Bridgeport Interact 2 - Y Axis Drive Belt Replacement

8.
Adjust
the belt tension
so it is tensioned by a
force
of approximately 1
3
5N
(3
0 lbf). If no belt
tension
meter is
available an approximate
guide is that
at
mid
position between
the
pulleys
the
belt
will
deflect
6
mm
(7/4")
from its mean position
when
a
force
of
70N
(16
lbf) is
exerted on
the
belt.
9.
Reset
the
machine software
limits as
per
Section 7 .6.3 .
7 .1.2
Y
Axis
Drive Belt Replacement
To ensure that no damage occurs
to
the
Y
axis ballscrew
during this
procedure, two
people are
required,
one to
withdraw
the knee
front
bracket and
maintain
the alignrr.ent
of the assembly,
whilst the second
person
slips the
old belt
from
the
pulley and over
the end of the
leadscrew
and replaces it
with
a new one.
WARNING:
DISCONNECT POWER TO THE MACHINE
BY
THROWING THE
MAIN
CIRCUIT BREAKER TO THE'OFF' POSITION.
1. Remove
the owo
neoprene
covers
on
the top
of the knee.
2. Remove
ttre stop
pin on
knee
front
bracket
and slide covers
forward.
3.
Remove
the
T inspection
plate at the rear of
the top of the knee.
4. Remove
t}re access
hole cover on the
left hand side of the knee.
5.
Remove
the
motor bracket cover.
6.
Remove
the
motor
cover.
7. Slacken
the belt tension screw
on the motor bracket above
the motor
flange
8.
Support t}le motor
and remove the
four
screws securing
the
motor and
remove
the motor
The dowel pin, underneath
the
tension screw, will
be released
so
make sure this
item is
located.
9.
Remove
the rwo
fixing
screws
from
the top corners
of
the
knee
front
bracket and replace
with two screws
5/16
UNC x
5"
long.
These new
screws will
allow the
front bracket,
complete
with
the
Y
axis ballscrew to
be
slid
forward
to
give clearance
to remove the
drive
belt.
10. From
the access
hole in the
knee remove the
formed
copper
lubrication
pipe
from
the
top of
the ballnut.
Remove the
four
screws
securing
the ballnut
from its nut bracket.
11.
Withdraw
the
front
bracket
dowels
and remaining
fixing screws
and carefully
pull
forward the
front bracket complete with
the ballscrew
assembly.
The second
person
should
guide the
rear
of the leadscrew
to
maintain its
position
and
avoid
damage.
12. The old belt can
now be slipped
off the
pulley and clear
of the
rear of the leadscrew.
Fit
the
new
belt on the leadscrew
pulley
and
relocate the leadscrew
in its
rear bearing.
This bearing
is a
shell
needle
roller
bearing
and care must
be taken
to ensure
no damage
occurs to the
needle bearing
or
the
return tubes
of
the
ballscrew
assembly.
Ensure
the copper
lubrication
pipe
is
not uapped.
1
3.
Realign the ballnut
and
loosely
fit
the
four
screws.
7-2
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