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G1021Z 15" Planer -17-
Figure 14. Placing springs into knife slots.
Figure 15. Cover Removed, Jig on cutterhead
The knives of your planer must be periodically
adjusted and will ultimately need to be removed
for sharpening. Adjustments should be as precise
as possible with tolerances within .002"-.003" to
prolong the sharpness of the knife edges.
Improperly adjusted knives can cause an imbal-
ance condition in the cutterhead and shorten
bearing life, as well as produce substandard
planing results.
TO INSPECT THE KNIVES:
1. UNPLUG THE PLANER!
2. Remove the dust port and upper cover and
cutterhead guard to expose the top of the
cutterhead. See Figure 15.
Knife Inspection
The knives are set at the factory using jack
screws before shipping. Springs are also included
with your machine, installed beneath the knives.
These may be used instead of the jack screws
depending on your preference. Refer to Figure
13 for placement of the jack screws or springs.
Jack Screw
Spring
Figure 13. Typical placement of jack screws or
springs.
If you decide you prefer to use the spring adjust-
ment method, you need to remove each knife,
remove the jack screws, leave the two springs
under each knife, and replace the knife.
Loosen the gib bolts until the knife is loose in the
slot. The gib bolts turn clockwise to loosen and
counterclockwise to tighten (when facing the
head of the bolt). Carefully remove the knife. Back
the jack screws out completely from the threaded
hole and remove. If the springs have become dis-
lodged in the removal process, be sure to place 1
spring in each of the two holes in bottom of the
knife slot.The springs do not
go into the threaded
hole where the jack screws were installed. See
Figure 14.
When using jack screws, it is not necessary to
install the springs. However it will not affect the
adjustment if both the springs and jack screws
are in place together.