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For Machines Mfg. Since 7/09 Model SB1016/SB1036
-47-
OPERATION
Mounting Center in Spindle
1. DISCONNECT LATHE FROM POWER!
2. Thoroughly clean and dry the tapered
mating surfaces of the spindle bore, tapered
sleeve, and the center, making sure that no
lint or oil remains on the tapers.
3. Insert the center into the sleeve, then insert
the sleeve into the spindle bore through the
chuck or faceplate.
Figure 75 shows an example of the dead
center installed in the spindle, using a
lathe dog and faceplate for turning between
centers.
Centers
Figure 74 shows the dead centers included with
the lathe. In addition, an MT#7–MT#5 tapered
spindle sleeve is included for mounting centers in
the spindle.
Dead Centers
The dead center achieves more accurate
results than a live center, but it requires low
spindle speeds and a small amount of oil to
reduce friction and wear that will damage the
workpiece.
Use the dead center in the spindle, since the
workpiece does not rotate on the tip and does not
generate friction.
Use the carbide-tipped dead center in the
tailstock where the workpiece will rotate against
it and generate friction. The carbide-tipped dead
center can better withstand the effects of friction;
however, the tip of the center must be lubricated
to avoid premature wear and maximize smooth
operation. Also, using low spindle speeds will
also reduce the heat and wear from friction.
Live Centers
A live center has bearings that allow the center
tip and the workpiece to rotate together; it can be
installed in the spindle and 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 74. Tapered sleeve and dead centers.
Tapered
Sleeve
Dead Center
Carbide Tipped
Dead Center
Figure 75. Example of using a dead center with a
faceplate and lathe dog.
Dead Center
To avoid premature wear of the dead center
or damage to the workpiece, use low spindle
speeds and keep the tip of the dead center
mounted in the tailstock well lubricated.
Removing Center from Spindle
To remove the sleeve and center from the
spindle, insert a piece of round bar stock or
similar tool through the outboard end (on the left
side of the headstock), then while holding the
sleeve, have a second person tap the sleeve loose.