Jet JJ-6CSDX Operating Instructions And Parts Manual page 17

8. Replace the remaining two blades by
repeating steps 1 – 7.
9. Determine if knives need to be set.
Follow the Outfeed
section steps 3 and 4 only to determine if
knives need to be set. Do not complete the
entire outfeed table adjustment. If knives
need to be set, proceed to the Setting
Cutterhead Knives section.
8.9 Setting knives for rabbeting and
nicks
(NOTE: Rabbeting is not applicable to the JJ-
6HHDX helical head jointer)
To position the knives for rabbet cuts, take a
shop scale with 1/32" graduations and place it
against the end of the cutterhead. Slide the knife
out until it is at the 1/32" mark on the scale; that
is, the knife will now be 1/32" beyond the edge
of the cutterhead. The gib should remain in
normal position, even with the edge of the
cutterhead. (Figure 30). This adjustment will
ensure that the knife clears the end of the gib
and cutterhead, and has good contact with the
workpiece. (See the Rabbeting section for
further information.)
Note: This will also correct for small nicks
without requiring replacement of knives.
Figure 8-14
8.10 Rotating and replacing knife
inserts (JJ-6HHDX)
Knife inserts are dangerously
sharp. Use extreme caution when inspecting,
removing, or replacing knife inserts.
The knife inserts on the model JJ-6HHDX
Jointer are four-sided. When dull, simply remove
each insert, rotate it 90° for a fresh edge, and re-
install it. No further adjustment is necessary.
Use the two provided star point screwdrivers to
remove the knife insert screw. Use one of the
screwdrivers to help hold the cutterhead in
Table Adjustment
17
position, and the other to remove the screw. See
Figure 8-15. It is advisable to rotate all inserts at
the same time to maintain consistent cutting.
However, if one or more knife inserts develops a
nick, rotate only those inserts that are affected.
Each knife insert has an etched reference mark
so you can keep track of the rotations.
Figure 8-15 – HH models only
IMPORTANT: When
inserts, clean saw dust from the screw, the
insert, and the cutterhead platform. Dust
accumulation between these elements can
prevent the insert from seating properly, and
may affect the quality of the cut.
Before installing each screw, lightly coat the
screw threads with machine oil and wipe off any
excess.
Securely tighten each screw which holds the
knife inserts before operating the planer!
Make sure all knife insert
screws are tightened securely. Loose inserts
can be propelled at high speed from a
rotating cutterhead, causing injury.
8.11 Determining correct table height
When you receive the jointer, the knives have
been pre-set at the factory. However, the height
and parallelism of the knives with the outfeed
table should be checked, and any needed
adjustments made, before putting the jointer into
operation.
The outfeed table and cutterhead knives are
correctly adjusted when all three blades are
parallel to the outfeed table and all three blades
are set at the same height in the cutterhead.
removing or rotating