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•-•••••••••••••mm••••••••••••!!!S,iii--.-~------IIICI-"-"
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2.
LONGITUDINAL
LINES-
SCRATCHY
FINISH
A.
Wheel
too
soft
for
material being ground. The
grains in
too
soft
a wheel
will
pull
out
before
they
have
really dulled. The dressed surface
will
be lost
too
quickly
and the
few
remaining
pointed grains
will
give a scratchy appearance.
Replace
with
a harder wheel.
B. Wheel
dressed
too finely, or wheel
too
hard.
If
wheel
is
not
cutting
freely, longitudinal
lines in the finish, sometimes discolored
or
burnt,
will
result. Replace
with
a softer grade
wheel
or
pass
the diamond across the wheel
at
a faster
speed
when dressing. Do
not
dress
the
wheel
without
a downfeed before
each
cut.
C. "Hard-sheel"
sides
on
wheel. Break
the
corners
of
the grinding wheel
with
an
abrasive stick.
D.Grinding
swart in coolant. Clean
out
cool-
ant tank.
3.
INACCURATE
GRINDING
A.
Magnetic chuck clamped
too
tightly
or
too
loosely. A chuck
or
fixture
clamped
too
tight-
ly
may warp the table, causing
it
to
rock in
the saddle ways rather than tracking smoothly.
If
chuck
is
not
clamped
tight
enough,
it
could
shift
position and
lift
up
and over
dirt
. Tighten one
of
the clamps
firmly
to
hold
the
chuck in position when the table reverses.
Then tighten the
other
clamp
only
enough
to
keep the chuck
down
on the table.
B. Wheel glazed and
not
cutting
freely. Re-dress
wheel,
or
replace wheel
with
a
so
fter
grade.
C.
Machine
out
of
level.
Be
sure
that
base
cabinet
was leveled according
to
installation instruc-
tions
. The thickness
of
the
four
vibration
isolation pads
that
support
the grinder
on
the
,
base
cabinet
has
been adjusted
to
support
the
·· · grinder
base
so
that
the plane
of
the
V-ways
10
are exactly parallel
with
the plane
of
the
flat
ways.
If
grinder
base
is
located on anything
other
than its own
base
cabinet and
vibration
isolation pads,
base
ways should
be
checked
for
twist
by
la
ying a small surface plate on
two
1.000 inch rolls in the V-ways and
two
.582 inch parallels on
the
flat
ways
of
the
base.
If
the
two
rolls are placed in the ends
of
the· V-ways and one
of
the paral lels
put
in
the center
of
the
flat
way, the
he
ight
of
the
pads should
be
adjusted
until
one gets the
same
"feel"
at
either end
of
the
flat
way
with
the
other
parallel.
D.Magnetic chuck in
need
of
dressing.
See
"Grinding
magnetic chucks" in
the
operating
instructions
of
the manual.
E. Grinding wheel shifted in adaptor.
If
the
wheel
is
not
tight
enough on the adaptor,
it
can
shift
when the grinder
is
t urned on and
off,
or
when a heavy
cut
is
being taken. This
could
cause
the grinder
to
cut
an
additional
few thousandths,
as
well
as
giving a chatter
appearance on the surface.
F. Downfeed inaccurate.
See
section
"Uneven
response in downfeeding" below.
4. MOTORS DO
NOT
RUN
A.
Fuses
blown
out.
If
the spindle
motor
will
not
run,
or
if it
is
running at a slow speed, one
or
more fuses
may
be
blown
out.
Check
the
line leading
to
t
he
machine
to
make sure
plant
circuit
fuses are
not
blown.
CAUTION:
All
checks
of
the electrical sy-
stem should
be
made
by
qualified personnel.
On rare occasions a fuse
will
blow
under
normal machine
usage.
If
a fuse
blows
repeat-
edly, however, the
cause
must
be
found
and
corrected.
NOTE:
A stalled
motor
can
blow
a fuse. Wiring
to
the
motors
should
be
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