Replacing/Rotating Knife Inserts; Basic Operation; Operating Precautions; Correct Operating Position - Jet JJ-6HHBT Operating Instructions And Parts Manual

Figure 10-3

10.3 Replacing/rotating knife inserts

Knife inserts are extremely
sharp. Use caution
changing. Failure to comply may cause
serious injury.
Disconnect jointer from power source/unplug.
The knife inserts on the model JJ-6HHBT are
four-sided. When dull, simply remove each
insert, rotate it 90° for a fresh edge, and re-install
it.
Use the provided star point screwdriver to
remove the knife insert screw. See Figure 10-4.
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 affected.
Each knife insert has etched numerals to keep
track of the rotations.
Figure 10-4
when cleaning or
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. Knife
inserts should be torqued to approximately 50 to
55 inch- pounds.
screws are tightened securely. Loose inserts
can be propelled at high speed from a
rotating cutterhead, causing injury.

11.0 Basic Operation

Note: The Figures are general in nature and
may not show your particular jointer model.

11.1 Operating precautions


Always use sharp cutter knives.

The jointer fence must securely be locked
before machine use.

Check workpiece for foreign objects (nails,
screws) and for loose knots.

Feed with thicker workpiece end at the
front, hollow side downward.

Plane the stock with the grain, if possible.

Support long workpieces with roller stands
or an assistant.

Use push block(s) or push stick if possible
to keep hands away from cutting area.

11.2 Correct operating position

The operator must be positioned offset to the
infeed table, as shown in Figure 11-1.
11
removing or
Make sure all knife insert
rotating