Southbend SB1001 owner manual Selecting Spindle Speed Range, To Change the Drive Belt Position

For Machines Mfg. Since 8/11 O P E R A T I O N Model SB1001 8K™ Lathe

Selecting Spindle Speed Range

There are two ranges of available spindle speeds that are selected by repositioning the drive belt between the idler and spindle pulleys (see Figures 47–48).

Spindle

Pulley

Belt

in Low

Range

Position

Idler

Pulley

Figure 47 . Drive belt between idler and spindle

pulleys in the low range position.

Belt in

High Range

Position

Figure 48. Drive belt between idler and spindle

pulleys in the high range position.

When the drive belt is in the outside position, as shown in Figure 47, the low range of spindle speeds (50–200 RPM) are available.

When the drive belt is in the inside position, as shown in Figure 48, the high range (200–2400 RPM) of spindle speeds is available.

Tools Needed	Qty
Wrench 16mm	.......................................................1
Wrench 17mm	.......................................................1

To Change the Drive Belt Position:

1.DISCONNECT LATHE FROM POWER!

2.Open the end cover.

3.Loosen the pivot block hex nut (see Figure 49). This will allow the tensioning bolt to change the position of the idler pulley in the next step.

Idler

Pulley

Apply

Pressure

Here

Pivot

Block

Tensioning Bolt

Figure 49. Drive belt tensioning controls.

4.Turn the tensioning bolt counterclockwise to raise the idler pulley and release the belt tension.

5.Roll the belt from the current position on the idler and spindle pulleys to other position (outside for the low range and inside for the high range).

Important: Make sure the belt is positioned across the full width of the pulleys and the ribs of the belt are fully seated in the pulley grooves.

6.Apply moderate pressure on the idler pulley toward the front of the lathe (see Figure 49) while tightening the tensioning bolt clockwise.

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