DJ20 Adjustments

I compiled these instructions from a fax received from Delta and Porter Cable Corporation and expanded on the description where I felt more information was needed.

Jointer Table Adjustment Procedure

for jointers with parallelogram table action.

Note: The tables on these types of jointers are adjusted by means of eccentric bushings that are located at the four corners of each table. Rotating the bushings will raise/lower the table at that point. The most important tool required is a good-machined straight edge. The accuracy of the adjustment depends entirely on the quality of the straight edge.
 
 

Procedure:

Prepare Jointer:

1. Disconnect the machine from the power source.

2. Remove the guard and slide the fence body all the way to the rear of its travel.

Measure Flatness:

3. Individual infeed and outfeed table flatness must be checked first and be in tolerance before attempting to level the tables. To check, lay a straight edge lengthwise down the center of each individual table. Using a set of feeler gauges, measure the largest gap between the table surface and the straight edge. This gap should not exceed:

 
DJ15 .008"
DJ20 .008"
DJ30 .010"
RJ42 .015"

Level outfeed table:

4. Lower the infeed table 1/4" below the cutterhead,

5. Place the straight edge over the cutterhead body and at the rear of the outfeed table (A, Fig. 1A),

6. Back out the positive stops on the outfeed table. Loosen the table lock knob/lever and raise or lower the outfeed table until the end of the straight edge clears the cutterhead by exactly.010", Use a feeler gauge to measure the clearance. Note: the .010" gap is a critical dimension. Tighten the table lock knob/lever.

7 Place the straight edge over the cutterhead body at the front of the outfeed table (B, Fig, 1 A). Again the cutterhead to straight edge gap should be exactly .010".

8. If an adjustment is necessary, proceed as follows: Locate the eccentric bushing (H Fig. l A) and loosen its locking set screws) or lock screw. Rotate the bushing clockwise or counterclockwise to obtain the .010" gap that is required between the straight edge and the cutterhead body. Re-tighten the bushing's set/lock screw.

9. Place the straight edge diagonally over the cutterhead body and outfeed table (C, Fig. l A). The cutterhead body To straight edge gap must measure exactly .010". If an adjustment is needy locate the eccentric bushing (I, Fig. 1A) and adjust as in step 8.

10. Place the straight edge diagonally over the cutterhead body and outfeed table (D, Fig- 1A). The cutterhead body to straight edge gap must measure exactly .010". If an adjustment is needed, locate the eccentric bushing (J, Fig. 1A) and adjust as in step 8.
 
 

11.Place the straight edge across the outfeed table and onto the infeed table as shown in (A, Fig. 2A). While holding down firmly on the outfeed end of the straight edge, place a .010" feeler gauge under the straight edge at location (G, Fig. 2A). Raise the infeed table up until the 010" feeler gauge just touches the bottom of the straight edge and tighten the infeed table lock knob/lever.

12. While holding down firmly on the outfeed end of the straight edge, insert a .010" feeler gauge at location (H, Fig. 2A). This measurement should also be .010".If an adjustment is needed, locate the eccentric bushing (D, Fig. 2A) and adjust as in step 8.

13. Place the straight edge across the outfeed table and onto the infeed table as shown in (B, Fig. 2A). While holding down firmly on the outfeed end of the straight edge, insert a. 010" feeler gauge at location (I, Fig. 2A). If an adjustment is needed, locate eccentric bushing (E, Fig. 2A) and adjust as in step 8.

14, While holding firmly down on the outfeed end of the straight edge, insert a .010" Feeler gauge at location (J, Fig. 2A). If an adjustment is needed, locate the eccentric bushing (F, Fig. 2A.) and adjust as in step 8. Note: On some models the pointer must be removed to rotate the bushing.

15. Raise the outFeed table to its working height (dead level with the knives when they are at the top of the cutting circle) and tighten the positive stop screws and table lock lever/handle.

16.Replace all covers, guards and pointers that were previously removed.

17. In cases where the infeed and outfeed tables were severely out of parallel, it may be necessary to repeat steps 4 through 14 a second time to "fine tune" the table parallelism.
 
 
 
 
 
Figure 1: DJ-15 / DJ-20

A=Eccentric bushing. 

B=Set screw hole. Important-There are 2 set screws in this location. Remove the outer screw and loosen the inner screw ½ of a turn.

Figure 2: shows the set screw location (D), at the end of the base, for the 8th bushing of the DJ-15 & DJ-20

Figure 3: RJ-42

A=Bushing lock screw. 

B=Eccentric bushing.

Figure 4: DJ-30

A=Eccentric bushing. 

B=Set screw hole. This unit only has one set screw per bushing.

© 2008 Mark Goodall