W1755 6" Parallelogram Jointer
Adjusting/Replacing
Knives
Setting the knives correctly is crucial to the proper oper- ation of the jointer and is very important in keeping the knives sharp. If one knife is higher than the others, it will do the majority of the work, and thus, dull much faster than the others.
There are two options for setting the
Figure 45. Using knife setting jig to set
knife height.
Straightedge Method
A high quality straightedge is held flat against the outfeed table and the knife heights are set to the bottom of the straightedge, as shown in Figure 44. Because the knife projection height from the cutterhead is dependent on the outfeed table height, the outfeed table must be set as described in Setting Outfeed Table Height on Page 35 for this method to work correctly.
When using a straightedge to set the knives, you will not need to move the outfeed table once it is set and you will always be assured that the knives are even with the outfeed table in their highest point of
Knife Setting Jig Method
Both tables are lowered to fit the jig on the cutterhead, as shown in Figure 45, and the knife heights are set to just touch the middle pad of the jig.
The knife setting jig makes it easy to ensure that the knives project out of the cutterhead evenly. After using the knife setting jig to set the knives, you have to re- adjust the outfeed table height to ensure that it is even with the knives at their highest point of rotation. If you are using the positive stops on the tables, they will need to also be reset before operation. Also, for the knife set- ting jig to work correctly, the outfeed table must be par- allel with the cutterhead.
