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For Machines Mfg. Since 8/11 Model SB1001 8K
™
Lathe
-33-
OPERATION
Live Centers
A live center (see Figure 35 for an example)
has bearings that allow the center tip and the
workpiece to rotate together—it can be installed
in the tailstock quill for higher speeds. However,
a live center typically does not provide the
same level of rigidity as a dead center, and final
workpiece accuracy can suffer as a result.
Centers
Figure 34 shows the MT#3 and MT#2 dead
centers included with the lathe. In addition, an
MT#3–MT#2 tapered spindle sleeve is included
for mounting the MT#3 center in the spindle.
Figure 34. Tapered spindle sleeve and dead centers.
Adapter
Sleeve
MT#3
Center
MT#2
Center
Figure 35. Example of a live center (SB1241 MT#2
Live Center shown).
Dead Centers
A dead center is a one-piece center that does not
rotate with the workpiece and is used to support
long, slender workpieces
Use the dead center in the spindle for operations
where the workpiece rotates with the center and
does not generate friction.
When the dead center is used in the tailstock,
the workpiece pivots on the tip of the center. The
tip must be generously lubricated during the
operation to avoid premature wear and maximize
smooth operation. Using low spindle speeds will
also reduce the heat and wear from friction.