Powermatic 3520B User Manual download pdf (Page 18)

18

Sheave and Belt Alignment

The motor and spindle sheaves are aligned with

each other at the factory, but if any service is

performed that affects their alignment it is very

important that they be realigned. To realign

them, loosen the two set screws on the spindle

sheave (C, Figure 25) with a hex wrench, and

slide the spindle sheave into the proper position.

Re-tighten set screws.

When sheaves and belt are properly aligned,

there should be no unusual pulsing sounds or

noise coming from the belt.

Checking 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

26).

1. Use a screwdriver to carefully bend back

any tabs on the tabbed lock washer (C,

Figure 26) that interfere with the insets (B,

Figure 26) on the spanner nut.

2. Place the end of a flat head screwdriver

down against one of the insets of the

bearing lock nut (B, Figure 26).

3. Tap the handle of the screwdriver with a

mallet so that it turns the spanner nut (A,

Figure 26) tighter in a clockwise direction.

Rotate the spanner nut only about 1/16” at a

time.

Do not overtighten the

spanner nut or the spindle bearings will

overheat.

4. The spanner nut should be tightened just

enough to remove the end play and the

spindle should still rotate very freely. Run

the lathe for a time, and check for heat from

the spindle bearings. If the bearings are

running hot, the spanner nut is too tight and

should be loosened slightly.

5. After the spanner nut (B, Figure 26) has

been properly adjusted, carefully bend back

into place any tabs on the tabbed lock

washer (C, Figure 26).

Sheave/Drive Belt Replacement

Replacing the spindle sheave can be a difficult

procedure; it is recommended that the

headstock be taken to an authorized service

center for this.

Figure 26

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