User Manual

14
10.4 Replacing cutterhead knives
(straight knives only)
Disconnect machine from
power source before making any adjustments.
Failure to comply may cause serious injury.
1. Disconnect machine from the power source.
2. Remove the cutterhead guard (B, Fig. 8).
Cutterhead knives are
dangerously sharp. Use extreme caution when
inspecting, removing, sharpening, or replacing
knives into the cutterhead. Failure to comply
may cause serious injury.
Refer to Figures 11 and 12:
3. Turn all five screws (A) into the lock bar (B) by
turning in a clockwise direction as viewed from
the infeed table (G).
4. Carefully remove the cutter knife (C) and lock
bar (B).
5. Repeat for remaining two knives.
6. Thoroughly clean all surfaces of the
cutterhead, knife slots and lock bars of any
dust or debris.
7. Insert replacement knife (C) into the knife slot,
making sure it faces the proper direction.
8. Insert lock bar (B) and tighten just enough to
hold in place.
9. Repeat for other two blades.
The knives must now be adjusted as described in
sect. 10.3, Setting cutterhead knives.
10.5 Replacing or rotating knife
inserts (helical cutterhead only)
The knife inserts on the model JJP-12HH 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 13. 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 an etched reference mark to
keep track of the rotations.
An extra set of 5 knife inserts and knife insert
screws are included with your JJP-12HH.
Figure 13
(Model JJP-12HH only)
IMPORTANT: When removing or rotating 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.
Make sure all knife insert screws
are tightened securely. Loose inserts can be
propelled at high speed from a rotating
cutterhead, causing injury.