CHECKING,
ADJUSTING AND
REPLACING KNIVES
When checking, adjusting or replacing the cutterhead
knives on the
20"
Planer, proceed as follows:
1.
DISCONNECT THE MACHINE FROM THE POWER
SOURCE AND REMOV.E THE TOP COVER OF THE
PLANER EXPOSING THE CUTTERHEAD.
A. Check all four knives for proper setting using the
knife gage (A), as shown in Fig.
21.
When the gage
(A) is placed on the cutterhead and the bottom
of the two roll pins, one of which is shown at (8),
are against the edge of the slot (C) opposite the
knife, the knife should just contact the bottom of
the gage (0).
8. If any of the knives require an adjustment, slightly
loosen the knife locking bar of each of the four
knives by turning the knife locking screws, four of
which are shown at (E) Fig.
21,
into the locking bar
just enough to relieve stress in the cutterhead but
not disturb the setting of the four knives.
C. To adjust the knife that must be reset, loosen all
of that knife's locking screws (E) Fig.
21,
by turning
them into the locking bar. As the knife locking bar
becomes loose, lifter springs under the knife will
raise the knife until it contacts the bottom of the
gage (0). Then snug up the knife locking bar by
lightly backing out the locking screws (E) against
the knife slot.
IMPORTANT: AT THIS TIME,
ONLY TIGHTEN THE KNIFE INTO THE SLOT
ENOUGH TO HOLD IT IN POSITION.
O.
If additional knives must be reset, repeat
STEP C.
E. After all four knives are set with the screws just
snug, back out and tighten the locking screws, four
of which are shown at (E) Fig.
21,
against the slot.
Start with the end screws first and proceed on
alternate sides toward the center screws until the
knife is securely held in the cutterhead. Tighten the
remaining three knives in the same manner.
10
Fig.
21
2.
If the knives are removed for sharpening, care must
be exercised in replacing and resetting them, as follows:
A. To remove each knife, loosen the knife locking bar,
by turning the locking screws, four of which are
shown at (E) Fig.
21,
into the knife locking bar and
remove the locking bar, knife and springs located
under the knife.
8. Remove the remaining three knives in the same
manner.
C. Thoroughly clean the knife slots, knife bars, springs
and screws. If the threads appear worn or stripped
or if the heads are becoming rounded, replace
them.
O.
Inspect the cutting edge of the knives for nicks or
dull wire edges. Hone the knives slightly using a
stone or if the knives are to be. sharpened, main
tain a cutting angle of
40
degrees.
E. Insert springs, knives and knife locking bars into
all four slots in the cutterhead. Push knives down
as far as possible and back out locking screws, four
of which are shown at (E) Fig.
21,
just enough to
hold all four knives in the cutterhead.
F. Adjust all four knives as explained in
STEP 1
above.
