Southbend SB1001 - Manual (Page 33)

For Machines Mfg. Since 8/11 Model SB1001 8K ™ Lathe
-31-
O P E R A T I O N
Offsetting Tailstock
The tailstock can be offset from the spindle
centerline for turning tapers. Move the tailstock
top casting toward the front of the lathe to
machine a taper at the tailstock end. Conversely,
position the tailstock top casting toward the back
of the lathe to machine a taper at the spindle
end.
Note: The marks on the offset indicator are
arbitrary. For a precise offset, use a dial
indicator to check quill movement while
adjusting the screws.
Tools Needed Qty
Hex Wrench 3mm .................................................1
Wrench 13mm .......................................................1
To offset the tailstock:
1. Loosen the tailstock lock nut to release the
clamping pressure between the top and
bottom castings (see Figure 28).
Turn
CCW
Turn
CCW
Turn
CW
Turn
CW
Figure 29. Set screw adjustment in relation to
tailstock movement for desired taper.
2. Loosen one offset set screw, then tighten the
other to move the tailstock top casting in
the desired direction (see the illustration in
Figure 29).
3. Make sure both offset set screws are snug,
then re-tighten the tailstock lock nut to
secure the offset.
Aligning Tailstock to Spindle
Centerline
This is an essential adjustment that should be
verified or performed each time the tailstock
is used to turn concentric workpieces between
centers. If the tailstock is not aligned with the
spindle centerline when it is supposed to be,
turning results will be inaccurate along the
length of the workpiece.
Items Needed Qty
Hex Wrench 3mm .................................................1
Wrench 13mm .......................................................1
Round Stock 2" x 6" ...............................................2
Dial Indicator w/Magnetic Base ...........................1
Precision Calipers .................................................1
Precision Level ......................................................1
To align the tailstock to the spindle
centerline:
1. Use the precision level to make sure the
bedway is level from side-to-side and from
front-to-back.
— If the bedway is not level, correct
this condition before continuing with
this procedure (refer to Leveling &
Mounting on Page 19 for additional
information).
Figure 28. Tailstock offset controls.
Offset
Scale
Tailstock
Lock Nut
Offset Set Screw
(1 of 2)