Powermatic 4224B operating instructions Speed change, Checking spindle play

Figure 29

3.Install comparator dead center in the comparator bracket and tighten lock handle. See Figure 30.

4.Mount spur center with the spindle blank that you will be turning. Loosen tailstock locking handle, and slide tailstock until live center is about 1-inch from spindle blank, then tighten locking handle. Advance live center using tailstock handwheel, until live center is secured in spindle blank.

5.Mount reference spindle between comparator centers, as shown in Figure 30.

NOTE: Reference spindle should be mounted last after all adjustment of tailstock and quill has been accomplished with spindle blank. Likewise, when turning operation is complete, remove reference spindle first.

Figure 30

(shown with optional bed extension)

9.12Speed change

1.Disconnect lathe from power source.

2.Open belt access door.

3.Loosen lock handle (A, Figure 31) and lift up handle (B) to raise motor. Tighten lock handle

(A) to hold motor in raised position.

4.There should be sufficient slack in the belt to reposition it to the other steps on the sheaves. The label on the access door shows the required belt position.

Figure 31

Belt shown in High speed range position

5.Loosen lock handle (A) and lower motor to tension belt. Be sure that the Poly-V grooves of the belt seat properly in corresponding groove of sheave. Do not overtension; a very light pressure on the tension handle (B) is adequate to prevent belt slippage.

6.Tighten lock handle (A).

9.13Checking spindle play

The spindle bearing has been set at the factory for general turning applications. There should be no "end play" or looseness along the spindle’s axis. If any looseness should ever occur, it may be rectified by carefully tightening the bearing lock nut on the spindle, as follows. (See Figure 32).

1.Loosen set screws and remove handwheel from headstock.

2.Use a screwdriver to carefully bend back any tabs on the tabbed lock washer (C, Figure 32) that interfere with the insets on the bearing lock nut (D).

3.Place the end of a flat head screwdriver down against one of the insets of the bearing lock nut (D).

4.Tap the handle of the screwdriver with a mallet so that it turns the bearing lock nut (D) tighter in a clockwise direction. Rotate the bearing lock nut only about 1/16” at a time.

Do not over-tighten the bearing lock nut or the spindle bearings may overheat during operation.

20