KNIFE INSPECTION. Grizzly G1033

Knife Inspection

The G1033 20" Planer comes equipped with a 4knife 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 pulley) 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 causes the adjuster’s legs to not seat on the cutterhead, the knives need to be adjusted.

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 setting 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 cutterhead, 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 protrusion 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 remaining knives. As mentioned before, the standard adjuster is satisfactory for reasonably accurate knife setting tasks.

Loosen

Tighten

Figure 13.

Knife height adjustment.

G1033 20" Planer

Figure 14.

Cutterhead assembly.

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