Replacing Cutterhead Knives - Grizzly G0725 Owner's Manual

Replacing
Cutterhead Knives
The Model G0725 jointer has a two-knife
cutterhead. Under normal operation these knives
will become dull and need to be sharpened or
replaced. Refer to Troubleshooting (Page 31) to
determine if the knives may be dull.
You can order new knives or a knife hone from
Grizzly, see Accessories on Page 29.
To replace cutterhead knives:
1.
DISCONNECT MACHINE FROM POWER.
2.
Carefully rotate the cutterhead until clamp
screws are accessible.
Cutterhead knives are sharp. Use caution
when handling cutterhead knives. Use
gloves to reduce the risk of injury.
3.
Remove the four cutterhead clamp screws
fastening the knife to cutterhead (see
Figure 45). Carefully remove the knife and
clamp from cutterhead.
Cutterhead
Clamp Screws
Figure 45. Cutterhead knife clamp screws.
4. Repeat Steps 1–3 for the second cutterhead
knife.
5. Clean the cutterhead thoroughly before
installing new knives or re-installing sharp-
ened knives.
Model G0725 (Mfd. Since 02/20)
6. Install the knife and clamp in the cutterhead
and slightly tighten each of the clamp screws
in sequence, as shown in Figure 46.
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Figure 46. Clamp screw tightening sequence.
Note: By tightening the clamp screws out of
sequence, the shape of the knife may be affected,
hampering the jointing capabilities of the machine.
Following the tightening sequence reduces that
possibility.
7. Repeat Step 6 for the second cutterhead
knife.
8.
Check the alignment of the knives to the
outfeed table. They must be parallel. If the
knife is not parallel to the outfeed table, use
the knife adjustment jack screws (see Figure
47) to fine tune the position of the knife. Refer
to Checking Outfeed Table Alignment on
Page 17 for detailed instructions for adjusting
the position of the knife.
Knife
Adjustment
Jack
Screws
Figure 47. Knife adjustment jack screws.
9.
Following the tightening sequence (see
Figure 46), final tighten each of the clamp
screws.
10. Return the cutterhead guard to the operating
position and ensure it is working properly.
Re-align the fence and tables as needed.
Test the jointer on a piece of scrap material.
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