Grizzly G9740 instruction manual Carbide Cutters, Aftermarket Knife Setting Jigs

3.Wear heavy leather gloves or place a rag over the exposed knife to protect your hands if the wrench slips while loosening the gib bolts. Loosen all the gib bolts on one knife.

4.Insert a 4mm hex wrench into the jack screws (accessible from holes in the cutterhead) as shown in Figure 9. Turn these screws to lower the knife enough to clear the jig when it is placed on the cutterhead body.

Figure 9. Adjusting knife jack screws.

5.Turn the jack screws with the hex wrench to raise the knife so it barely touches the jig. Perform this adjustment on both ends.

6.Tighten the gib bolts on each side just enough to keep the knife from moving—DO NOT fully tighten at this time.

7.Repeat steps 2-6on the other three knives, then move on to step 8.

8.Tighten the gib bolts, with medium pres- sure, in this order: (1) The two center bolts on each of the four knives, (2) the next two bolts outward from the center of each knife, and (3) the rest of the gib bolts in this man- ner until all bolts on all four knives have been tightened with medium pressure.

9.Now final tighten each of the bolts in the same manner as step 8.Tightening the gib bolts two at a time, each knife at a time, will prevent distortion of the cutterhead from over-torquing the gib bolts.

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10.Replace all of the removed planer parts and adjust the pressure bar (pages 17-18) before operating the planer.

Aftermarket Knife Setting Jigs

To ease the knife adjustment process, con- sider using a Planer Pal® available in the current Grizzly catalog. Using magnets, a pair of these devices will automatically hold the knife blades within .001" of each other, thereby allowing you to quickly and accurately lock the knife in place.

Carbide Cutters

The Models G9740Z/G9967Z/G9961 feature spi- ral cutterheads. These spiral cutterheads cut with indexable carbide inserts which have four cut- ting edges. Although only one edge can cut at a time, the inserts can be easily rotated when they get dull, essentially providing four factory sharp edges before requiring replacement. Indexable inserts never need to be adjusted for height, only rotated and securely fastened to the cutterhead.

When rotating cutters, the dot on each cutter is used as a reference point when determining which cutter edges are used, or dull, and which are sharp. Be sure to always rotate the cutters in the same direction (see Figure 10). Otherwise, the dot will not be an effective reference for deter- mining which cutting surfaces are sharp.

When replacing the carbide cutters, the dimen- sions are 14mm x 14mm x 2mm, with a 6.5mm bore and 30° relief angles (Model H2334 in the current Grizzly Catalog).

In addition, the spiral cutterhead planers are sup- plied with an air wrench for loosening and tight- ening the carbide cutter Torx® screws. This tool is very valuable if you have to rotate or change many of the cutters at one time. T-20 Torx® bits are also included.

Extreme Duty Planers