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Figure 27. properly held workpiece for offset
machining at low rpM.
7.
Make fine adjustments by slightly loosening
one jaw and tightening the opposing jaw until
the workpiece is precisely aligned.
8.
use a lower rpM when machining heavy
eccentric workpieces.
Faceplate
the faceplate can be used to turn non-cylindri-
cal parts or for off-center turning by clamping the
workpiece to the faceplate.
installing the faceplate follows the same steps as
any of the lathe chucks. install according to the
instructions for three-jaw chucks found on page
20.
To load a workpiece:
1.
support the workpiece.
2.
slide the tailstock to the workpiece.
3.
lock the tailstock and then turn the tailstock
quill so the dead center makes contact with
the centerpoint of your workpiece. For more
information refer to centers in this section on
page 30.
g0554 gear-head Floor lathe
4.
lock the tailstock quill when sufficient pres-
sure is applied to hold the workpiece in place.
depending on the workpiece, some additional
support may be needed.
use a minimum of three independent
clamping devices when turning eccentric
workpieces. Failure to provide adequate
clamping will cause workpiece to eject.
5.
secure the workpiece with a minimum of
three independent clamping devices (see
Figure 28). take into account rotation and
the cutting forces applied to the workpiece
when clamping to the faceplate. Make sure
your clamping application will not fail!
Figure 28. Faceplate with properly clamped
eccentric in four locations.
6.
use a lower rpM when machining heavy
eccentric workpieces.
Securely
workpiece
the chuck key! Thrown
objects from a lathe can
cause serious injury or
death to the operator and
to bystanders many feet
away.
clamp
your
and
remove
-25-
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