Southbend SB1001 - Manual (Page 41)

For Machines Mfg. Since 8/11 Model SB1001 8K ™ Lathe
-39-
O P E R A T I O N
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).
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
Figure 47 . Drive belt between idler and spindle
pulleys in the low range position.
Belt
in Low
Range
Position
Idler
Pulley
Spindle
Pulley
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.
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.
Figure 49. Drive belt tensioning controls.
Pivot
Block
Apply
Pressure
Here
Idler
Pulley
Tensioning Bolt
Figure 48. Drive belt between idler and spindle
pulleys in the high range position.
Belt in
High Range
Position