Jet JPJ-12B, Operating Instructions And Parts Manual

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15
For best results, knives should be set at
approximately .04" above the cutterhead. Knife
height should not vary more than .002 - .003"
across the length of the cutterhead. All three
knives must be set at equal height in the
cutterhead and parallel to the outfeed table
across their length.
17. After all three knives are positioned properly
in the cutterhead and made snug, continue
tightening the
gib screws (F). The gib screws
should be tightened in increments, to prevent
any distortion to the cutterhead or buckling of
the knives. Begin tightening the gib screws a
little more on one knife. Start with the center
screw and work your way to the ends. Do not
fully tighten yet.
18. Rotate the cutterhead to the other two knives
in turn. Repeat step 17 for each knife.
19. The tightening process should continue at
least two more times, each time tightening
the
gib screws (F) further on all three knives
in turn. On the third time, the gib screws
should all be firmly tightened.
Before operating the machine,
make sure all gib screws are firmly tightened.
A loose knife thrown from the cutterhead can
cause severe or fatal injury.
20. After all knife adjustments are completed, the
upper back panel (C, Fig. 17) and the fence
assembly (A, Fig. 17) should be placed back
on the machine before operating.
Figure 16
– Straight Knife Cutterhead
(Model JPJ-12B Only)
Figure 17
– Straight Knife Cutterhead
(Model JPJ-12B Only)
10.5 Replacing Cutterhead Knives
(Straight Knives Only)
Refer to Figures 16 and 17:
Disconnect machine from
power source before making any
adjustments. Failure to comply may cause
serious injury.
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.
1. Disconnect machine from power source.
2. Fully swing the cutterhead guard (G, Fig. 11)
away from the fence (B, Fig. 11). It is
recommended to then use a 6mm hex
wrench (one is included with the machine) as
a makeshift stop to hold the guard in place.
To do this, insert the wrench into the front
right roller tension adjustment screw. The
cutterhead guard can then be released and
the wrench will prevent it from swinging back
towards the fence.
3. Turn all seven gib lock screws (F) into the
lock bar (G) by turning in a clockwise
direction as viewed from the infeed table (H).
4. Carefully remove the cutter knife (E) and lock
bar (G).
5. Thoroughly clean all surfaces of the
cutterhead, knife slots, and lock bars of any
dust or debris.
6. Insert the replacement knife (E) into the knife
slot, making sure it faces the proper direction.