___________
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________
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-...:
612F072)
by
loosening the
two
screws and
sliding
the
guard up
so
the
screw heads
will
pass
through the key hole
slot
in the
guard. The valve should
be
reset
by
closing
it
down completely and then reopening ½
turn.
If
dripping
from
the ways continues,
close the valve back
to
the
point
where
it
is
opened approximately
1/3
of
a
turn.
6.
UNEVEN
DOWNFEEDING RESPONSE
A.
Wheel
too
loose.
If
grinder
has
been stopped
and re-started
with
the
wheel
insufficiently
tight,
the wheel may
have
shifted slightly
when the
motor
was
re
-started,
cutting
an
additional amount
because
of
being
off
center.
Re-tighten grinding wheel.
B.
No
oil
on
column ways. Check
oil
level in
sight
glass
at
the
top
of
the column
shortly
after spindle
motor
is
turned on.
If
oil
does
not
appear, make sure
that
oil cup on
the
back
of
machine
base
is
at least half filled.
Add
oil
if
necessary.
If
oil
is
at
the proper level,
see
that
pump
is running and
that
filter
screen
is
clean.
(see
LUBRICA
T/ON
under
MAINTENANCE)
Check
that
oil
lin
es
are
intact and on
their
proper fittings
as
shown in Figures 16 and 17.
C. Spindle housing assembly sticking in column
ways. The exceptional
rigidity
of
the Harig
Grinder
is
obtained
by
an
extremely close
fit
on
the
column ways. Since there
is
only
a
few
tenths clearance between
the
spindle
housing and column, any
dirt,
grit,
or
a very
small warping
of
the back plate, could
cause
spindle housing
to
"hang
up"
in the ways.
12
Check
for
this
condition
by
mounting
an
indicator on the wheel guard
or
spindle hous-
ing
to
touch
a block on
the
grinder table.
Turn
the downfeed handwheel and
note
the
response
on
the
indicator. The
100
lb. com-
bined weight
of
the
motor,
spindle and hous-
ing and guard assembly should keep the bevel
gear
carrying the elevating screw
firmly
seated
in the
thrust
ball bearing in the column cap.
(see
Figure 18). The
only
slack
that
should
be
seen
as
the
co
lumn
is
raised and lowered
with
the handwheel should
be
the small amo
unt
between the bevel
gear
and the pin ion on the
handwheel shaft.
If
the response between the
handwheel readings and the indicator show a
slack
of
several
thousandths rather than
the
normal half thousandth slack between the
pinion
and
bevel
gear, the spindle housing
assembly
is
probably "hanging
up"
in
the
column ways
until
the bevel
gear
is
backed
up
to
the pinion and forces the elevating
screw down.
To
inspect column ways, the grinding wheel
should
be
removed
from
the spindle. Then
remove
the
wheel guard
by
loosening its
clamping screw and sliding
it
off
the
end
of
the spindle. The five
5/16"
set screws holding
the spindle cartridge in the housing sho
uld
be
loosened approximate
ly
1/8"
. The spindle
cartridge and
motor
assembly
can
now
be
removed
from
the back
of
the
machine. The
six phillips head screws
that
hold
the
back
dust guard retainer
in
place should
be
taken
out
and dust slides and retainer removed.
Crank
the
saddle away
from
the
column
and remove the six phillips head screws
holding
the
front
dust guard retainer. The
front
dust slides
can
now
be
removed.
Now
alternately crank
the
spindle housing
to
the
top
and then
to
the
bottom
of
the
travel,
wipe
off
the
ways
with
a clean c
loth
and
inspect.
Any
dirt
or
grit
should be removed.
Check
to
see
if
a piece
of
grit
has
scored
the
ways.
If
so,
they
shou Id
be
dressed
with
a
fine stone
to
remove any ridges.
If
the column way surfaces
are
clean and
smooth and the spindle assembly
is
still
sticking, either the spindle slide back plate
has
warped
or
the
column uprights have moved
closer together
by
a
few
tenths.
If
the spindle
housing
is
tight
in
only
a small area,
the
back
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