Live Centers - Grizzly G4000 Owner's Manual

Live Centers

the dead center achieves a more accurate fin-
ished product but requires low spindle speeds to
avoid heat from friction damaging the center of
workpiece. the live center has bearings that allow
the center tip and the workpiece to rotate together,
and can be installed in the tailstock quill for higher
speeds and less time spent lubricating the tip, but
with a slight bit of accuracy loss.
using Dead Center in the Spindle
1.
disConnECt LAthE FroM poWEr!
2. thoroughly clean the tapered mating sur-
faces of the spindle bore and the Mt#3 dead
center, then insert the center into the spindle
bore through the chuck or faceplate.
3. install a lathe dog on the workpiece, then
mount the workpiece between the spindle and
tailstock centers with the lathe dog inserted
into the chuck or faceplate (see figure 27 on
the previous page for an example).
4.
to remove the 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 tap the center loose.
Note: Hold onto the center as you tap it loose
to avoid dropping it and damaging the tip or
the bedways.
NOTICE
To avoid premature wear of the dead center
or damage to the workpiece, always use
lower spindle speeds and keep the dead
center tip well lubricated.
-26-
using a Center in the Tailstock
1.
disConnECt LAthE FroM poWEr!
2.
thoroughly clean the tapered mating surfac-
es of the tailstock quill bore and the center.
3.
use the tailstock handwheel to feed the quill
out from the casting at least
poses of stability and accuracy no more than
1 ⁄ ".
1
4
Note: The scale on the tailstock handwheel
is marked in 0.025mm increments (approxi-
mately 0.001") with one full revolution moving
the quill 1.25mm (approximately 0.050").
4.
seat the center into the quill, position the
tailstock so that the tip of the center presses
against the workpiece enough to hold it in
place, then tighten the tailstock lock nut.
5.
rotate the tailstock handwheel clockwise to
feed the center farther into the workpiece
until it is snug, then tighten the quill lock
lever.
Note: The force against the mounted
workpiece will fully seat the center's taper
into the quill. However, do not overly force
the center into the workpiece with the hand-
wheel—this will make removing the center
very difficult and could damage it.
6.
to remove the center from the quill, hold
onto it with one hand, then rotate the tailstock
handwheel counterclockwise to draw the quill
back into the casting until the center releas-
es.
Model G4000 (Mfg. Since 8/09)
⁄ ", but for pur-
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