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Harig 612 - Improper Longitudinal Feed

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ways
of
the
column
shou
Id
be
scraped
to
remove
the
high
spot.
The
high areas
of
the
way
can be
found
by
applying
a
thin
layer
of
red lead
to
the
ways
and
running
the
housing
assembly
up
and
down.
If
the
assembly
is
tight
over
the
entire
column,
the
back
plate
should
be removed
from
the
spindle housing
by
taking
out
the
six
5/16"
screws holding
it
in place. Grind .
0003"
off
the
two
surfaces
that
ride
on
the
column
ways.
Accurately
check
the
step
between
the
way
surface
of
the
back pla
te
and
the
center
part
that
is
screwed
to
the
spindle
housing
before
grinding
the
way
surface, so
the
entire
back
plate
can be
reground
if
found
to
be
warped.
Reassemble
the
back plate
to
the
spindle
housing,
and
if
too
tight,
remove an
additional
.0003"
from
the
way
surface.
D.Spindle housing too loose. If
the
error
in
downfeed
response
is
less
than
.
001",
spindle
housing assembly
may
be
too
loose in
the
column
ways. Remove
motor
spindle assembly
and
dust
guards as
outlined
in
the
previous
paragraph.
The
amount
of
looseness can
then
be
determined
by
placing an
indicator
on
the
grinder
table
to
read against
the
part
of
the
spindle housing projecting
to
the
front
of
the
grinder. With
the
column
ways
wiped
clean
of
oil,
alternately
twist
the
spindle housing
from
one
side
to
the
other.
The
difference
of
the
indicator
reading
when
the
twisting
pressure
is
released
shou
Id
be less
than
a ha
If
a
thou-
sandth.
Make
this
check
at
both
the
top
and
bottom
po
sitions
of
the
spindle housing,
as
well
as
in
the
middle, and use
the
lowest read-
ing. Remove
the
back plate
from
the
spindle
hou
sing.
Th
en remove ¾
of
the
difference
between
the
at
rest
indicator
readings
from
the
center
area
of
the
back plate
that
is
clamped
against
the
spindle housing.
For
example
, if
.0012"
slack
is
found,
.0009"
is
removed
from
the
center
area
of
the
plate.
E. Spindle assembly
creeps
down. Because
of
the
exceptionally
smooth
action
of
the
down-
feed mechanism, it
would
be
possible
for
the
spindle
assembly
to
creep
down
or
"unwind"
itself if a frictional drag
were
not
used.
This
creep
is
most
likely
to
occur
if a
vibration
caused
by
an
off
balance wheel
is
occurring.
The
C spring no.
612F088
adds
a drag
to
the
system
by
pressing against
the
moving
bevel gear
and
the
stationary
outer
race
of
the
thrust
bearing
(see
Figure 18).
To
increase
this
drag,
the
spring can
be
removed
and
bent
in a vise
to
reduce
the
1-31/32
dimension
from
the
top
to
the
bottom
of
the
C
to
approximately
1-7/8
to
1-29/32.
Remove
the
C spring
from
the
machine
by
using
two
allen head
wrenches
that
measure
3/32
or
5/64
across
the
flats.
Take
out
the
3
screws holdi
ng
the
elevating screw guard in
place and lift
the
guard off. Use
the
downfeed
handwheel
to
turn
the
bevel gear.
This
carries
the
C spring
with
it, so
that
one
of
the
alien
head wrenches wedges against
the
front
of
the
C spring and
the
pinion
shaft
of
the
hand-
wheel.
Then
use
the
other
alien
head
wrench
to
push
the
back
end
of
the
C spring across
the
high
point
of
the
bearing
and
bevel gear,
allowing
the
C spring
to
be lifted
up
and
out
by
hooking
the
center
and
lifting
with
the
allen head wrench. Bend
the
spring
into
a
smaller
diameter
,
and
reassemble
by
dropping
the
open
end
of
the
C
under
the
bevel gear,
pushing
the
back
of
the
C
down
with
a screw
driver until
the
spring
is
horizontal,
and
then
moving
the
spring sideways
to
snap
across
the
high
point
of
the
gear
and
fit
in
the
angular
space between
the
bearing race
and
bevel
gear
again.
7. IMPROPER
LONGITUDINAL
FEED
A.
Improper
longitudinal feed
(cable
drive mach-
ines
only)
If
table
does
not
move
when
hand
-
wheel is
turned,
tighten
cable. Loosen cable
hook
locknut
(see
Fig.
20)
and
tighten
the
adjusting
nut
to
pull
the
cable
tighter.
Do
not
overtighten,
as
this
may
cause
cable
to
break
prematurely,
or
wear
a flat surface
into
the
nylon
cable
covering.
Tighten
only
enough
to
pull
the
table
without
slip.
13

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