Maintenance; Blade Care; Sharpening Knives (Straight Knives Only); Lubrication - Jet JJP-12 Operating Instructions And Parts Manual

12.0 Maintenance

12.1 Blade care

Blades are extremely sharp!
Use caution when cleaning or changing.
Failure to comply may cause serious injury!
The condition of the blades will affect the

precision of the cut. Observe the quality of
the cut that the planer produces to check the
condition of the blades.
Dull blades will tear, rather than cut the

wood fibers and
appearance.
Raised grain will occur when dull blades

pound on wood that has varying density. A
raised edge will also be produced where the
blades have been nicked.
When gum and pitch collect on the blades,
carefully remove with a strong solvent. Failure to
remove gum and pitch build up may result in
excessive friction, blade wear and overheating.
When blades become dull, touch up blades. See
sect. 12.2, Sharpening the Knives.
12.2 Sharpening knives (straight
knives only)
Blades are extremely sharp!
Use caution when handling.
comply may cause serious injury!
1. Disconnect the machine from the power
source.
2. Remove the blade guard and belt cover.
3. To protect the infeed table from scratches,
partially cover the sharpening stone with
paper (Figure 24).
4. Lay the stone on the infeed table.
5. Lower the infeed table and turn the
cutterhead by turning the cutterhead pulley.
The infeed table height is set properly when
the stone's surface is flush with the knife
bevel.
produce a fuzzy
Failure to
6. Keep the cutterhead from rotating by
grasping the cutterhead pulley while sliding
the stone back and forth across the table.
7. Take the same amount of passes for all
three blades.
If the blades have been sharpened and still are
not cutting efficiently, trying to touch up the
blades further will only cause the formation of a
second beveled edge. When this starts to
happen, it is time to replace blades with another
set. It is recommended to keep a second set of
blades on hand so that they may be installed
while the first set is being professionally
sharpened.
helical knife inserts! Only rotate the knife
once it is dull. If all sides have been rotated
properly, dispose of the knife and replace it
with a replacement insert. Refer to sect. 10.5,
Replacing or rotating knife inserts.

13.0 Lubrication

Use a good grade of light grease on the

steel adjusting screws located in the raising
and lowering mechanisms of the work
tables.
The cutterhead ball bearings are lifetime
lubricated and need no further care.
21
Figure 24
Do NOT attempt to sharpen