JET 708475 Use and Care Manual download pdf (Page 12)

Adjustments

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.

Disconnect machine from

power source before making any adjustments.

Failure to comply may cause serious injury.

Coplanar Alignment

Definition of coplanar

When the infeed table is set to the same level as

the outfeed table and together both tables form 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.

Referring to Figures 8 and 9:

1. Disconnect jointer from power source.

2. Loosen the lock knob (A) and slide the

cutterhead guard (B, C) to clear the table.

3. Slide the fence assembly back (H, E) as far as

it will go, or remove it from the machine

entirely.

4. Rotate the cutterhead to avoid knife

interference.

Figure 8

Figure 9

5. Place a straight edge (D) across the front of the

outfeed table (F) and extending over the infeed

table (G). Note the position of the infeed table

(G). Note the position of the straight edge in

Figure 8 with respect to the fence (H).

6. Raise the infeed table (G) until it contacts the

straight edge (D).

The straight edge should lie level across both

tables. Move the straight edge to the back of the

outfeed table as shown in Figure 9 and perform the

same test.

If the straight edge does not lie level, the front or

back of one of the tables must be adjusted to make

the tables coplanar. Proceed as described in

Performing the Coplanar Alignment (following page).

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JET 708475 Use and Care Manual Page 12

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