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mounting block). The work is then removed from the
mounting block.
An auxiliary chuck of softwood is now made in the same
manner that the cylinder chuck is made. This chuck must
have a turned recess properly sized to accommodate the
rim of the bowl in a tight press fit.
When the bowl is mounted in this chuck, the bottom can
be cleaned off and slightly recessed to complete the
desired contours.
Figure 64
TURNING A RING
One method of turning a ring requires a spindle chuck.
•
The work stock is first mounted to a backing block held by
the large faceplate and is turned to shape on the outer
side. The inside diameter of the ring is also shaped - all
the way through to the backing block.
•
The work is then removed from the backing block.
•
A spindle chuck is now prepared so that it will be a tight
press to fit inside the ring.The ring is reversed and mount-
ed on this chuck. With the ring mounted, the remaining
contours can be turned to shape.
Figure 65
Another method of turning a ring makes use of a recessed
chuck.
•
The work stock is mounted on a screw center and one half of
the ring is formed, but the ring is not cut away from its center.
•
The stock is then removed, and a recessed chuck-
mounted
on the large faceplate - is prepared to receive the ring in a
tight press fit.
•
After being chucked, the remaining face of the ring can be
turned to the proper contour, thus cutting away the center
portion.
•
In work of this type, take constant measurements
or, better
yet, use a template to guard against over or under cutting.
Figure 66
TURNING BALLS
Deep Cup Chuck
Figure 68
•
Wooden balls of large size are first roughly turned between
centers, using standard procedures.
•
Smaller balls can be mounted as faceplates on the small
faceplate or screw center.
•
Lines drawn to indicate the center and ends of the ball
shape are helpful in plotting the curve.
•
A template should always be used for accurate visual
observation of the work progress.
Figure 67
If the ball is mounted as a faceplate turning, almost the entire
surface can be turned before it becomes necessary to rechuck it.
•
Rechucking can be be accomplished in a deep cup chuck
which will hold the finished portion of the ball in a tight press fit.
Another method of rechucking is to use a shallow cup chuck
which will not support the ball alone, but must be used in con-
junction with the tailstock.
•
When using the shallow chuck, a wood block is fitted to the
tailstock so that the ball can revolve upon it. This block
should be lubricated with beeswax or grease.
•
In using the shallow chuck method, the ball is constantly
shifted - never more than 1/8 turn - and always in a definite
pattern.
rew Center
BaBI "stock "_
Center
Shallow Bearing Center
Since turning between centers makes the work a perfect
sphere across the grain, the ball must be mounted in the
chuck so that the first scraping cuts will round it up in the
opposite direction.
TURNED BOXES
Turned boxes involve deep recessing together with a special sys-
tem of working the lid and body of the box together as one unit.
• The inside of the lid is turned first.
•
Next, the inside of the body is turned. A careful check must
be made when turning the lip of the body portion so that
the lid will be a tight press fit.
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