Replacing Knives (JJ-6CSDX)
Planer knives are dangerously sharp. Use extreme caution when inspecting, removing, sharpening, or replacing knives. Failure to comply may cause serious injury.
To remove and replace a knife (Refer to Figure 29):
1.Remove four gib screws (A) with a 4mm hex wrench.
2.Remove the gib (B) and knife (C).
If the knife is being reused (knives are double- edged), clean the knife, gib and cutterhead of all pitch and debris.
3.Lay the new knife or unused edge of the old knife back onto the cutterhead (D).
4.Replace the gib (B) and screws (A). Finger tighten only at this time.
5.Press against the cutting edge of the knife at the center of the blade with a piece of wood. DO NOT USE FINGERS! This is to ensure that the cam is making proper contact with the knife.
6.Snug the inside two screws, then the outside two screws.
7.Release the piece of wood pressing against the knife and tighten the gib screws.
8.Replace the remaining two blades by repeating steps 1 – 7.
9.Determine if knives need to be set.
Follow the Outfeed Table Adjustment section steps 3 and 4 only to determine if knives need to be set. Do not complete the entire outfeed table adjustment. If knives need to be set, proceed to the Setting Cutterhead Knives section.
Setting Knives for Rabbeting and Nicks
To position the knives for rabbet cuts, take a shop scale with 1/32” graduations and place it against the end of the cutterhead. Slide the knife out until it is at the 1/32” mark on the scale; that is, the knife will now be 1/32” beyond the edge of the cutterhead. The gib should remain in normal position, even with the edge of the cutterhead. (Figure 30). This adjustment will ensure that the knife clears the end of the gib and cutterhead, and has good contact with the workpiece. (See the Rabbeting section for further information.)
Note: This will also correct for small nicks without requiring replacement of blades.
20
Figure 29
Figure 30