Setting Cutterhead Knives - Jet JJP-12 Operating Instructions And Parts Manual

Setting Cutterhead Knives

Important: Before performing any adjustments in
this section, the infeed and outfeed tables must be
coplanar (see Coplanar Alignment on page 12).
Cutterhead
dangerously sharp! Use extreme caution when
inspecting, removing, sharpening or replacing
knives into the cutterhead. Failure to comply
may cause serious injury!
1. Disconnect machine from the power source.
2. Remove the cutterhead guard (B, Fig. 8).
Referring to Figures 11 and 12:
3. Carefully number each knife blade (C) with a
magic marker to differentiate each.
Note: To rotate the cutterhead the cutterhead
pulley must be turned. This requires removing the
panel on the back of the cabinet for access.
4. Rotate the cutterhead (E) and determine the
12 o'clock position of knife number one. The
12 o'clock position is the highest point a blade
will reach in the cutting arc (C, Fig. 12).
5. Set a straightedge (J) on the outfeed table (F)
near the fence (H). One end of the straight-
edge should be positioned over the cutting
knife (C) near the end of the blade as shown in
Fig. 9.
Use care when handling the
straightedge near
damage.
Note the position of the knife blade with
respect to the straightedge, then move the
straightedge to the other side of the table and
again note the position of the knife blade with
respect to the straight-edge.
Blade number one must be at the same height
at each end and must also be at the same
height as the outfeed table (bottom of
straightedge). If
adjustment is required as follows:
6. Slightly loosen five gib lock screws (A) by
turning into the lock bar (B), clockwise as
viewed from the infeed table (G).
7. Adjust the blade height by turning jack screws
(D) upon which the blades rest. To lower the
blade, turn the screw clockwise. To raise, turn
the screw counter-clockwise.
8. When the blade is at the proper height,
alternately tighten the five gib lock screws (A).
Repeat steps 4 – 8 for blades two and three.
knives
the blades to prevent
this is not the case,
are
D
E
14
Figure 11
B
C
A
Figure 12