Grizzly G0776 - Section 4: Operation - Center Removal and Installation; Removing Centers from Spindle and Tailstock; Mounting Centers in the Tailstock

-42-
Model G0776 (Mfd. Since 7/14)
Removing Center from Spindle
Carbide-Tipped
Dead Center
To remove the sleeve and center from the spindle,
insert a piece of round bar stock (or similar)
through the outside end of the spindle. Have
another person hold onto the sleeve and center
with a gloved hand or shop rag, then tap the bar
stock to knock the sleeve loose.
Mounting Center in Tailstock
Either a carbide-tipped dead center or live center
can be used in the tailstock. Mounting instructions
are the same for both. The
Figure below
shows
an example photo of a dead center mounted in a
tailstock.
Figure 48. Example of using a carbide-tipped
dead center installed in the tailstock.
To mount a center in tailstock:
1.
DISCONNECT MACHINE FROM POWER!
2.
Thoroughly clean and dry tapered mating
surfaces of tailstock quill bore and center,
making sure no lint or oil remains on tapers.
To avoid premature wear of dead center
or damage to workpiece, use low spindle
speeds and keep tip of dead center mounted
in tailstock well lubricated.
3. Use quill handwheel to feed quill out from
casting approximately 1".
Note: The maximum quill travel is 4", but
we do not recommend extending the quill
more than 2" or stability and accuracy will be
reduced.
4. Insert center into tailstock quill.
5.
Seat center firmly into quill during workpiece
installation by rotating quill handwheel clock-
wise to apply pressure with center engaged
in center hole of workpiece.
Note: Only apply enough pressure with
tailstock quill to securely mount workpiece
between centers. Avoid overtightening cen-
ter against workpiece, or it may become
difficult to remove later, and it will result in
excessive friction and heat, which may dam-
age workpiece and center.
Removing Center from Tailstock
To remove the center from the quill, hold onto it
with a gloved hand or shop rag, then rotate the
quill handwheel counterclockwise to draw the quill
back into the casting until the center releases.
If the center does not come loose by retracting the
quill, extend the quill to expose the slot shown in
the
Figure below, then use a drift key to remove
the center.
Figure 49. Drift key slot in the side of the quill.
Drift Key Slot