Southbend SB1001 owner manual Dead Centers, Live Centers

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

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.

Adapter

Sleeve

MT#2

Center

MT#3

Center

Figure 34. Tapered spindle sleeve and dead centers.

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.

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.

Figure 35. Example of a live center (SB1241 MT#2

Live Center shown).

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