Powermatic DDS-225, DDS-237 operating instructions Lead Screw Thread Clearance, Corrective action

4.Insert a tool, such as a hex wrench or screwdriver, through the hole on top of the leadscrew (Fig 18) at that corner of the table that is lowest.

5.Turn the leadscrew clockwise to raise the table.

6.When the adjustment is complete, install the chain over the four sprockets, and over the chain tensioner roller. Push back the chain tensioner assembly until proper tension is achieved, then tighten the socket head cap screw on the chain tensioner.

7.Install front and rear cover plates.

After this procedure, the pressure rollers should be checked and adjusted if necessary (see Pressure Rollers on page 16).

Lead Screw Thread Clearance

Referring to Figure 19 – If adjusting the table height becomes difficult or if excessive clearance forms between the lead screws and bushings, adjustment may be required as described below.

Symptoms

ˆTable wobble is noted

ˆDifficulty is noted in table height adjustment

Corrective action

1.Determine the corner(s) requiring adjustment.

2.Use a 1/8" hex wrench to loosen the setscrew (A, Fig. 19) between 1/4 and 1/2 turn.

To remove excessive clearance

3.Using a 1-1/8" wrench, slightly tighten the eccentric bushing (B) by turning clockwise (from right to left).

For clearance too tight, causing difficulty in table height adjustment

3.Using a 1-1/8" wrench, slightly loosen the eccentric bushing (B) by turning counter- clockwise (from left to right).

After adjustment

4. Tighten the setscrew (A).

After adjusting the lead screw clearance, the table must be rechecked for parallelism (previous section).

Figure 18

Figure 19

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