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G1033 20" Planer -15-
Knife Inspection
The G1033 20" Planer comes equipped with a 4-
knife cutterhead. The knives must be periodically
replaced or adjusted. Adjustments should be as
precise as possible with tolerances within ±.001''
to prolong the sharpness of the knife edges.
Improperly adjusted knives can unbalance the
cutterhead and shorten bearing life, as well as
produce substandard planing results. The knives
are set at the factory before shipping, but now is
a good time to double-check. To inspect and
adjust knife set:
1. Remove the upper cover to expose the top
of the cutterhead.
2. Carefully turn the cutterhead (using the pul-
ley) until the first knife is top dead center.
3. Using the knife adjusting jig, check the
knife height. The jig should sit solidly with
both feet on the cutterhead. See Figure 13.
If the knife is adjusted properly, the contact
point at the center of each adjuster should
just touch the tip of the knife. If the knife
does not make contact, or if the knife caus-
es the adjuster’s legs to not seat on the cut-
terhead, the knives need to be adjusted.
Figure 13. Knife height adjustment.
Knife Adjustment
The knives are locked into the cutterhead with
wedge type gibs and gib bolts. Springs under the
knives give an upward pressure to help in the set-
ting process. To re-align the knives:
1. Loosen the gib bolts until the knife is forced
upward by the springs. The gib bolts turn
clockwise to loosen and counterclockwise
to tighten (when facing the head of the
bolt). See Figure 14.
2. Place the adjusters on the cutterhead as
described above, so the feet are securely
planted on the cutterhead. Make sure the
adjuster extension rod is parallel to the cut-
terhead, so both ends of the knife receive
equal pressure from the adjuster.
3. The downward pressure provided by the
adjuster will set the knives at a uniform pro-
trusion of approximately .070" above the
cutter. The knife height should vary no
more than .001" across the length of the
cutterhead.
4. Maintain a constant pressure on the
adjuster while re-tightening the gib bolts.
5. Repeat the same procedure on the remain-
ing knives. As mentioned before, the stan-
dard adjuster is satisfactory for reasonably
accurate knife setting tasks.
Figure 14. Cutterhead assembly.
Tighten
Loosen