Southbend 18' & 60: EVS Toolroom Lathes 220v sb1016 - Manual (Page 44)

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For Machines Mfg. Since 7/09 Model SB1016/SB1036 O P E R A T I O N
The tailstock can be offset from the spindle
centerline for turning tapers. The offset
movement is controlled by two opposing cap
screws on the front and back sides of the
tailstock (see Figure 63).
Figure 63. Offsetting cap screw.
The amount of movement is indicated by the
offset scale on the back of the tailstock (see
Figure 64). However, since the actual value of
the scale is a function of workpiece length. The
angle increments of the offset scale have been
left as arbitrary lines only intended for use as a
quick reference.
For actual calculations when returning the
tailstock to the lathe centerline or defining
actual angles, use a test indicator to check quill
movement while adjusting screws.
Offsetting
Rear Offsetting Cap Screw
Front
Offsetting Cap
Screw
Tool Needed Qty
Hex Wrench 6mm ................................................. 1
Wrench 28mm ....................................................... 1
To offset the tailstock from the spindle
centerline, loosen the tailstock, and the front and
rear lock bolts, then rotate the tailstock offset
screws shown in Figures 64–65.
Turn
CCW Turn
CCW Turn
CW Turn
CW
Figure 65. Tailstock offset screw adjustment.
Installing Tooling
This tailstock uses a quill with an MT#5 taper
with a lock slot at the bottom to accept lock tang
arbors and drill bits (see Figure 66).
Figure 66. Types of tapered arbors and tooling.
Standard Length w/Lock Tanged End
Short Length
w/Solid End
Standard Length w/Screw End
Short Length
w/Open End
Standard Length w/Solid End
The tang is essential to prevent an arbor or drill
bit from breaking loose should the bit grab the
workpiece suddenly, or if the drill bit is under
heavy torque. If tooling spins inside the quill, it
will gall the tapered mating surfaces. Repairing
this type of damage can be time consuming or
require outright quill replacement.
Figure 64. Tailstock offset scale.
Offset
Scale
Rear Lock Bolt
Front Lock Bolt
Tailstock
Offset
Screw