Model G0857/G0858 (Mfd. Since 07/19)
-39-
Setting/Replacing
Knives (G0857)
Inspecting Knives
Setting the knives correctly is crucial to the proper
operation of the jointer and it plays an important
role in keeping the knives sharp. If one knife is
higher than the others, it will do the majority of the
work, and thus, become dull much faster.
The knife jig included with the jointer is designed
to set all the knives evenly and at the correct
height in the cutterhead.
The cutterhead in this jointer is equipped with
jack screws that allow for careful positioning of
the knives.
The cutterhead on this jointer comes with both
jack screws and springs for setting knife height.
Which one you choose is a matter of personal
preference. However, only one of these options is
needed to set the knives.
There are two options for setting the knives—the
straightedge method and the knife-setting jig
method. Each option has advantages and disad-
vantages; the correct one for you will be a mat-
ter of personal preference. For best results, the
tables must be parallel with each other (refer to
Checking/Adjusting Table Parallelism) and the
outfeed table height must be properly set (refer to
Setting Outfeed Table Height).
Straightedge Method
A high quality straightedge (or Jointer Pal) is held
flat against the outfeed table and the knife heights
are set to the bottom of the straightedge, as
shown. Because the knife projection height from
the cutterhead is dependent on the outfeed table
height, the outfeed table must be set as described
in
Setting Outfeed Table Height for this method
to work correctly.
When using the straightedge method to set the
knives, you will not need to move the outfeed
table once it is set and you will always be assured
that the knives are even with the outfeed table in
their highest point of rotation (TDC)—even if the
cutterhead is not perfectly parallel with the out-
feed table.
Figure 33. Setting knife height with a straightedge.
To check knife height with a straightedge:
1. DISCONNECT MACHINE FROM POWER!
2. Remove cutterhead guard or block it open.
3. Using a straightedge on outfeed table, check
height of each knife at positions as shown.
Black Lines Represent
Straightedge Positions
From Overhead View
Straightedge
Outfeed
Infeed
Knife at TDC
Figure 34. Setting knife height with a Jointer Pal
®
.
— Knives are set correctly when they just
touch bottom of straightedge at TDC in
each of straightedge positions.
— If knives do not touch straightedge or they
lift up at any position, then those knives
need to be adjusted (refer to
Setting/
Replacing Knives on Page 40).
Item(s) Needed
Qty
Precision Straightedge or Knife-Setting Jig ...... 1
Hex Wrench 3mm .............................................. 1
Open-End Wrench 10mm .................................. 1
Summary of Contents for G0857
Page 65: ......
