Coplanar Alignment - Jet JPJ-12B Operating Instructions And Parts Manual

5. If the fence (A) is not square to the table,
release the tilt locking handle (G), loosen the
lock nut (B), and turn the stop bolt (C) until
the fence is square to the table.
6. Tighten the lock nut (B) to retain the setting.
Tighten the tilt locking handle (G).
45° Backward Stop Fence Adjustment
The 45º fence backward stop (fence positioned
away from the operator) is controlled by the
backward stop bolt (H).
1. Set the infeed table (F, Fig. 7) to approx-
imately the same height as the outfeed table
(A, Fig. 7).
2. Move the fence (A) by releasing the
assembly locking handle (F) and pushing the
fence assembly (E) until it overlaps the
tables, then tighten the assembly locking
handle (F).
3. Adjust the fence (A) to a 135° angle by
releasing the tilt locking handle (G), moving
the stop plate (D) out of the way, and
positioning the fence against the backward
stop bolt (H). Tighten the tilt locking handle
(G).
4. Place an angle measuring device on the table
and against the fence (A) to confirm a 135º
setting.
5. To adjust, loosen the tilt locking handle (G)
and lock nut (I), then turn the backward stop
bolt (H) until a 135º angle is obtained.
6. Tighten the lock nut (I) to retain the setting.
Tighten the tilt locking handle (G).
Figure 9
10.2 Table and Knife Adjustments
For accurate jointing, at least three things must
be true:
1. Infeed and outfeed tables must be coplanar.
2. Knives or knife inserts must be set in the
cutterhead so that the highest point of their
arc is level with the outfeed table.
3. On the standard cutterhead, knives must be
parallel with the outfeed table across the
entire length of the knives.
These alignments are explained below.

10.3 Coplanar Alignment

Definition of Coplanar
When the infeed table is set to the same level as
the outfeed table and all points on the tables lie in
the same plane, thus forming a "perfect" flat
surface, the tables are said to be coplanar.
For optimum performance of the jointer, the
infeed and outfeed tables must be coplanar. If
they are not, the finished workpiece may have a
slight taper or twist across its jointed width or
length.
Determining If Tables Are Coplanar
Refer to Figures 10 and 11:
The tables have been set coplanar at the factory,
but they should be double-checked by the
operator. Also, as the machine undergoes use,
the tables should be checked occasionally and
adjusted if necessary.
The procedure described below uses a steel
straight edge to set the tables, which should be
accurate enough for most purposes.
Important: The tables must be locked in position
when performing the following test.
power source
adjustments. Failure to comply may cause
serious injury.
1. Disconnect machine from power source.
2. Fully swing the cutterhead guard (G) away
from the fence (B). It is recommended to then
use a 6mm hex wrench (F) (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.
11
Disconnect machine from
before making any