Jet JPJ-12B Operating Instructions And Parts Manual page 14

Figure 13
8. Lock the outfeed table (A) at that height by
tightening the outfeed table lock handle (C,
Fig. 7).
The outfeed table has now been locked at a
standard height, level with the arc of the knife.
Note: After the outfeed table has been set at the
correct height, it should not be changed except
for special operations or after replacing knives.
On the helical cutterhead, after the outfeed table
has been set, no further adjustments will be
needed for the knife inserts. When inserts are
installed properly in the helical cutterhead, they
will automatically be set at the proper position.
On the straight knife cutterhead, further fine
adjustments will now be achieved by adjusting
the knives in the cutterhead. Proceed as follows.
Fine Knife Adjustment
9. Lower the infeed table (H) out of the way by
loosening the infeed table locking handle (D,
Fig. 7) and pushing down on the infeed table
adjustment handle (E, Fig. 7).
10. An aluminum knife setting gauge, shown in
Figure 14, is provided with the machine.
Place the knife setting gauge at the back of
the outfeed table (toward the fence support
side) and extending over the cutterhead (D)
as shown in Figure 14. Place the gauge so
that the right mark lines up with the edge of
the outfeed table, as shown.
Figure 14
11. Rotate the cutterhead clockwise. If the
outfeed table and knives are set correctly, the
knife will contact the gauge and move it until
the left mark lines up with the edge of the
outfeed table, as shown in Figure 15.
12. Place the knife gauge at the front of the
outfeed table and repeat the process.
This test should be performed on the remaining
knives using the provided gauge.
If any knife is either too high or too low at one of
its ends to correctly move the gauge as described
above, then the height and/or parallelism of that
knife in the cutterhead needs to be adjusted.
Proceed as follows.
13. Use a 13mm open wrench to slightly loosen
the seven gib lock screws (F) by turning into
the lock bar (G), clockwise as viewed from
the infeed table (H).
14. Adjust the blade (E) height by turning the jack
screws (C) upon which the blades rest with a
3mm hex wrench. To lower the blade, turn the
screw clockwise. To raise the blade, turn the
screw counterclockwise.
15. Use the edge of a board to push the knife (E)
back down so that it is flush against the jack
screws (C). Tighten the gib screws (F) only
enough to keep the knife in position in the
cutterhead. Do not fully tighten.
16. Check the height of the knife (E) again by
using the gauge at the front and back of the
outfeed table (A). Make further adjustments
to the jack screw(s) (C) as needed.
Repeat this process for each of the other knives
in turn. Do not fully tighten gib screws (F), only
tighten them enough to keep the knife in position.
14
Figure 15