Adjustments; Coplanar Alignment - Jet JJP-12 Operating Instructions And Parts Manual

Cutterhead Guard
Properly positioned, the cutterhead guard (H,
Fig. 7) should rest against the fence (A, Fig. 7).
Figure 7
Fence Movement
Refer to Figure 7:
The fence (A) can be moved forward (B) or
backward (C) across the width (W) of the table.
It also tilts up to 45 degrees backwards (D).
Loosen the lock knob (J), slide the guard into
position, then tighten the lock knob.
When edge jointing, the fence assembly should
periodically be moved to different positions to
distribute wear on the cutterhead knives.
To slide fence forward or backward:
1. If necessary, loosen the cutterhead guard
(H) to permit the fence assembly to move
freely without being constrained by the
guard.
2. Loosen two fence
handles (E).
3. Move the entire fence assembly to the
desired position; then re-tighten the handles
(E).
4. Readjust and secure the cutterhead guard.
To tilt fence backward:
The fence (A) can be tilted backward (D) up to
45° (that is, for a total included angle of 135°
from table surface) as follows:
1. Loosen locking handles (F).
2. Tilt the fence back (A, C) to the desired
angle up to 135 degrees. Or you can place
your beveled reference piece on the table
and against the fence, adjusting the fence
assembly locking
until the angle of the fence matches the
bevel of your gauge piece.
3. Tighten the locking handles (F).
4. Readjust and secure the cutterhead guard.

10.0 Adjustments

10.1 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.
power source
adjustments. Failure to comply may cause
serious injury.

10.2 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
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.
Refer to Figures 8 and 9:
1. Disconnect jointer from power source.
10
Disconnect machine from
before making any